Chevy 3970010

Aug 26, 2021 · On a small block Chevrolet, the casting number is found at the rear of the block on the driver's side (as is with Chevy's big block engines). The engine ID code stamping is located on a flat pad in front of the passenger side cylinder head (big blocks can be in the same location or above the timing chain cover, with inline-sixes stamped on the passenger side of the block behind the distributor).

Chevy 3970010. SBC 350 Bare Engine Block Casting # 3970010 4 Bolt Main Machined and Painted. stoversps. (174) 100% positive. Seller's other items. Contact seller. US $1,250.00. No Interest if paid in full in 6 mo on $99+ with PayPal Credit*.

Fresh 69 Camaro Z/28 302 DZ complete engine. This is the real deal, black casting # 3970010 casting date E 14 9 (May 14, 1969), engine pad stamp code V0527DZ (May 27). Cylinder heads casting # 3927186 casting date E 27 9 (May 27, 1969). More pictures and details coming soon. This is a great complete engine. Real four bolt main, correct original ...

1 post · Joined 2008. #1 · Aug 3, 2008. I have recently aquired a chevy small block and I'm having trouble finding out exactly what it is. I have found Four numbers. 3970010 along with "hecho en mexico" on the back drivers side. 254 on the back passenger side. 010 on the drivers side in front of the oil filter. and the engine code is "MK01800."Small Block Chevy BLOCK # 3970010 Engine Block Casting Numbers This is probably the most common 4" bore SBC Block cast. It has been used in many different applications. Only way I know to be sure of 2 or 4 bolt mains is to pull pan.SBC BLOCK # 3970010 Engine Block Casting Numbers This is probably the most common 4" bore SBC Block cast. It …Aug 26, 2022 · 3959538 - 327 CID, 2-bolt main, Chevy II recessed oil filter, # used for some Chevy II "CE" replacement blocks 3970010 - 302 CID, 1969, 4-bolt main, "Z-28 Camaro" block The Chevy 6.0 liter small block engine is an eight-cylinder engine aligned in the V formation and is called the Vortec L96. As of 2015, it is used primarily in Chevy’s heavy-duty t... SBC 350 V8 ENGINE MOTOR BLOCK 3970010 2 BOLT MAIN SMALL BLOCK CHEVY 30 OVER. Pre-Owned. 1 product rating. $749.99. camaro-parts-world (26,333) 99.9%. Was: $999.99 25% off. or Best Offer. Freight. SBC 350 V8 ENGINE MOTOR BLOCK 3970010 4 BOLT MAIN MJ21800 MADE IN MEXICO GM 2. Chevy Casting Number identification including Block casting numbers, cylinder head casting numbers, Crankshaft and intake casting numbers. ... 3970010. 69-79. 302/350 ...Restore60s said: Original starter number for your block is #119497. Thats a Delco part #. Walked out to the shop & wrote the number down.---:thumbup: Kind of a broad statement. 4 starters for any given chevy small block. 153 tooth flexplate. 168 tooth flexplate. 153 tooth flywheel.

Chevy Small Block Engine Casting Codes. First Generation Pictures; ... Passenger/Chevelle/Chevy II/Corvette/Camaro : 3970010 : 1970-80 : 350 : 145-350Replacing speakers in a vehicle is one of the simplest and most cost-effective ways of improving the sound in your car. The Chevrolet Colorado is a good candidate for speaker repla...Updated: 9/19/2023. Wiki User. ∙ 13y ago. Best Answer. GM engine block # 3970010 was used as early as 1968 on some 327ci engines. From 1969-1979 it was a 350ci engine. It could be a 2 or 4 bolt ...3109 posts · Joined 2010. #2 · Jan 18, 2011 (Edited) .060 is the max safe overbore. Don't go all the way to 60 over for the first build though. Go 30 over this time and then 10 over for each rebuilt after. If you go 60 over now then when it comes time to rebuild you will be screwed and have to buy a new block. Like.3970010 Detail - Casting Numbers .info: engine blocks, heads, and more. Loaded in 1 ms. There are 2,506 casting numbers in the database.High Nickel GM #3970010 Engine Block "010 020" Marked Block decoding High Nickel! I estimate this motor makes around 420hp at 5500rpm and around 450ft lbs torque. ... 3972110, ss rs camaro motor engine, 302 DZ, 302 MO, CHEVY ENGINE, CHEVY MOTOR, 1969 1970 CAMARO Z/28, 1970 LT1 MOTOR, 350 360HP, 350 370HP, 302 …

Chevy Small Block - Engine Block Casting Numbers Notes (for below): "High Power" is the maximum rate HP this block was used for, "Low Power" is the lowest rated horsepower RPO engine the block was used in. "Main Caps" is the number of bolts holding the cap. A "two-bolt" main, or a four-bolt main. Four bolt main blocks are …Driverside dipstick 3970010. I did a thorough cleaning to find a number to identify my block better as I am still thinking it is a 1976 or 71. On the 4.5'' pad on the front I got a number c61173 853 k06 03 9k. And on the side in picture one I think it says (d f 1). In picture 2 on the left ledge at the back it says 3970010 K and the number 2 in ... All these are identified here. Quickly, A = Chevelle, F = Camaro, X = Nova. If you're looking at the engine code - this is already known. If you're looking at the casting # information and it mentions 3970010 "A/F/X/Y/B".... basically this means "it's used in everything", whereas if it simply states "Y"... this means Corvette. Decoding small ... Engine casting # 3970010--how to find the year. Thanks to some GREAT help, I found my engine casting number. By looking on the web pages some of you guys suggested, that number was used on 350's from '69 to '80 (also on '69 302's and '69 327's), both 2 and 4 bolt.

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The engine serial number in big and small Chevy engines is denoted by seven digits, each symbolizing a specific detail. Below is the meaning of each of the letters and numbers in the engine serial number: 1st letter = assembly factory. 2nd and 3rd digits = month of the assembly. 4th and 5th digits = day of the assembly.Chevy Chevrolet small block V8 engine casting numbers - WaywardGarage.com - Hot Rods - Musclecars - Project Cars - Farm TrucksIf you’re in the market for a used SUV, a Chevy Blazer is definitely worth considering. Known for its reliability, versatility, and stylish design, the Chevy Blazer has been a popu...Q: Stock Chevy 350 horsepower casting number 3970010? That is the number of the block. It was used to build 302, 327, and 350 engines in 2 or 4 bolt main from 1969-1980. There is a machined pad on ...Chevy 3970010 Small Block 350 Engine Bare Block 4 Bolt ARP Main Bolts Standard. ... Listed 9 weeks ago in Mims, FL Door pickup. Message. Message. Save. Save. Share. Details. Condition. Used - like new. Small block Chevy 4 bolt main 010 engine block. Has been cleaned and checked. Has new ARP main bolts with it. TFS stamped should be ...

Join Date: Mar 2009. Location: Booneville,Ms. Posts: 505. 350 sbc question? 3970010 How much HP? Ok I have a 3970010 block and on the back of it where the flexplate goes its got 010 stamped on it with 020 right under it. It's a 4 bolt block and I just bought another one and its got the same stampings but this one runs and I was wondering about ...Mar 3, 2013 · Casting Number 3970010 Manufacturer Chevrolet Category Engine Blocks Type Small Block V8 Date 1969-1980 Notes 350, 2 bolt or 4 bolt . 75 Nova Custom 75 Nova Base. hello my old man has this small block chevy engine that im trying to find out what it is. the casting # is 3970010 (3970010 302/350 69-79 ...Jan 3, 2022 · GM engine block # 3970010 was used as early as 1968 on some 327ci engines. From 1969-1979 it was a 350ci engine. It could be a 2 or 4 bolt block used in cars, trucks and even corvettes. Casting number 3970010 is a common small block engine casting. It was used in 1968 on the 327 2-bolt engines used in the "A" body, and it was used as a 350 ... Chevy Casting Number identification including Block casting numbers, cylinder head casting numbers, Crankshaft and intake casting numbers. ... 3970010. 69-79. 302/350. car & Truck 2 & 4-Bolt Most common. 3970014. 68-79. 350. car & Truck 2 & 4-Bolt. 3970020. 69-73. 307. car & Truck 2-bolt. 3970024. 69-73. 307.The block casting number you gave doesn't exist, but it is fairly easy to figure out what you meant...."397010" is a digit short, the actual number is probably "3970010" which is a 4.00" bore block made from 1968-1979. The date code "B125" come out as "B" = February, "12" = day, "5" = last digit of year, which for that block casting would have ...Small Block Chevy BLOCK # 3970010 Engine Block Casting Numbers This is probably the most common 4" bore SBC Block cast. It has been used in many different applications. Only way I know to be sure of 2 or 4 bolt mains is to pull pan.SBC BLOCK # 3970010 Engine Block Casting Numbers This is probably the most common 4" bore SBC Block cast. It has ...Mar 31, 2024 ... Comments13 · 408 CI SMALL BLOCK CHEVY, PROJECT SLEEPER: DYNO TEST!!! WILL IT MAKE POWER??? · 5.3 Engine Assembled with DOD Delete and Bigger Cam (&nb...3970010 - This is a small block V8 engine that was produced from 1969 to 1980. It was used in a variety of GM trucks, including the Chevrolet Camaro, Corvette, …

This 69 350 block has casting number 3970010 with an E (May) 2 1969 casting date. All cylinders are standard bore. The block was originally installed in a big 1969 Chevrolet truck. The suffix code stamped on the deck pad is WM. No V.I.N. stamping anywhere on the block.

3970010: 327--2 : A: 1969-79: 3970010: 350: 185: 370: 2 or 4: car, truck, Vette: 1970-73: 3970014: 350: 200: 300: 2/4: LA built Camaro: 1969-73: 3970020: 307: 115: 200: 2: …Oct 6, 2010 · The block number - in this case 3970010 - is not the same as the block alloy casting codes (010, 020) that show alloy content and are cast inside the timing cover area on the front of the block. That's correct,and you may need to pull the cam gear to see it.It's the nickel and tin content in the block. Oct 14, 2015 · Looking to ID further. Looking at a Chevy engine with the 3970010 casting number and trying to find out more info. The numbers on the machined pad on the front passenger side of the block are 151420105 K10 3P CMJ. From the info I'm looking at the CMJ means "1974 350 T400 Police" or "1980 305 full size/Camaro", but shouldn't the 9 digit VIN code ... 350 SBC, Block# 3970010, V1008TYU. Jump to Latest Follow ... A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more! item 3 Free Shipping - GM Chevy 5.7 350 Short Block 1967-1979 3970010 w/ free hat! Free Shipping - GM Chevy 5.7 350 Short Block 1967-1979 3970010 w/ free hat! $4,890.00 3970010 = 68-80 350 2 or 4 bolt main 4 inch bore J67= October 6 1967, or 1977. This block was not cast in 67, so that leaves 77. If it says hecho in mexico on the block, I think it was above the pad location, it is a target 350 or crate engine built in Mexico. 3970010: 68-76: 350: 4-bolt: 3970020: 68-73: 307: ... just recently bought a 55 chevrolet 2 door sedan delivery .trying to pin down the motor size ..cant locate any ... C3 Tech/Performance - 1970 LT1 engine number - My 350 engine has an engine number starting with CEC. The block # is 3970010. I ordered this engine new over the parts counter from a Chevy dealer in 1972. I thought it was a 1970 LT1, but the CEC prefix doesn't match up with anything I can find in the books. What does...

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Restore60s said: Original starter number for your block is #119497. Thats a Delco part #. Walked out to the shop & wrote the number down.---:thumbup: Kind of a broad statement. 4 starters for any given chevy small block. 153 tooth flexplate. 168 tooth flexplate. 153 tooth flywheel.Chevy Casting Number identification including Block casting numbers, cylinder head casting numbers, Crankshaft and intake casting numbers. ... 3970010. 69-79. 302/350. car & Truck 2 & 4-Bolt Most common. 3970014. 68-79. 350. car & Truck 2 & 4-Bolt. 3970020. 69-73. 307. car & Truck 2-bolt. 3970024. 69-73. 307.1955 Chevrolet Bel Air Unrestored 15,000 Mile Survivor 1955 Chevrolet Nomad 1964 Malibu SS Unrestored 36,000 Mile Survivor ~ SOLD ... 3970010 350 block is what I'd call the normal 350 4 bolt main block. GM used millions of these over the years. Some of them have 2 bolt caps installed. same block casting is used for both 2 and 4 bolt …from Sierra Vista AZ. mortec will tell you it's a 1969-79 350 or a 69 302, based on the casting number. not much help, really. squirrel, Apr 6, 2006. SHARE POST #8.looking for id information on my small block chevy egine numbers. the block casting number is XXXXX the block number is XXXXX … read more. RICK. Service Director. High School or GED. 423 satisfied customers. Gm casting number 3970010, 350 4 bolt mail block.GM may be replacing tens of thousands of Bolt EV batteries, but it won’t have to pick up the tab for most of them. The automaker has reached a deal that will have LG pay nearly all...Nov 11, 2005. 8,399. living the dream in my own world... rwflather said: I also have a 3970010 block. It has the 010 and 020 on the back and front, so I also know it is a high tin/high nickel block. The casting date is I 3 9, so I assume it is late 69/early 70 block, and is a 4 blt main block.Is My Chevy A 350 With This Casting Number 3970010? Hi chevy70 . just like the boys are saying, it all depends on which crank (stroke) you are using. I have two …Oct 6, 2010 · The block number - in this case 3970010 - is not the same as the block alloy casting codes (010, 020) that show alloy content and are cast inside the timing cover area on the front of the block. That's correct,and you may need to pull the cam gear to see it.It's the nickel and tin content in the block. ….

For sale!! 70s Chevy small block aluminum heads, roller rockers, ARP fasteners, performer intake, .040 bore.. crane cam.Can someone please tell me what plugs to run in my 350 The casting number is 3970010 . Save Share. Like. ... Chevy Tri Five Forum. 2.5M posts 62.6K members Since 2005 A forum community dedicated to 1955, 1956, and 1957 Chevy owners and enthusiasts. Come join the discussion about restoration, engine swaps, reviews, performance, …R. Ray J Neal Discussion starter. 26 posts · Joined 2008. #6 ·May 16, 2008. Based on the suffix TJA I found it is one of two motors. 1973, 160hp conversion cab truck, or 1979, 165hp forward cab w/ AT. Based on the 3998991 heads (1972/1973) I would think it is the 160HP model. So Pretty much LOW compression motor.#1 · Aug 23, 2008. Thanks to some GREAT help, I found my engine casting number. By looking on the web pages some of you guys suggested, that number was used on 350's …Block Casting Number = 3970010; 1969-1979, 302/350 cid, car & Truck, 2 & 4-Bolt Mains, 4 Bolt Most common. This covers a huge array of engines. An interesting thing happened in Chevy plants sometime during the 1971 model year production; early in 1970, Congress past a law requiring all U.S. auto manufacturers to standardize the Partial …I just pulled this SBC from a 34 Vicky and this is the number on the back of the block 3970010. What I can determine is a 2 or 4-bolt main. How else can I tell without pulling the pan? Is this an engine worth …GM p/n 471529 for 12.75" 153 tooth w/ Converter Bolt Pattern of 9.75" or 10.75" (measured across) or GM # 471598 for 14" 168 tooth w/ Converter Bolt Pattern of 10.75" or 11.50". if you have a 10.75" converter pattern, match the flywheel to the starter so you won't have to buy a new starter. All these are identified here. Quickly, A = Chevelle, F = Camaro, X = Nova. If you're looking at the engine code - this is already known. If you're looking at the casting # information and it mentions 3970010 "A/F/X/Y/B".... basically this means "it's used in everything", whereas if it simply states "Y"... this means Corvette. Decoding small ... Chevy 3970010, Yes, one of the most durable low perf block and head combos GM ever made. The "010" blocks can be quite good. Many were made with 4 bolt mains and many were made with high levels of tin and nickel which makes them very durable. My memory of the "882" heads is that they are lightweight, low compression, "smog motor" heads that are …, GM engine block # 3970010 was used as early as 1968 on some 327ci engines. From 1969-1979 it was a 350ci engine. It could be a 2 or 4 bolt block used in cars, trucks and even corvettes. Casting number 3970010 is a common small block engine casting. It was used in 1968 on the 327 2-bolt engines used in the "A" body, and it was used as a 350 ..., Mar 31, 2024 ... Comments13 · 408 CI SMALL BLOCK CHEVY, PROJECT SLEEPER: DYNO TEST!!! WILL IT MAKE POWER??? · 5.3 Engine Assembled with DOD Delete and Bigger Cam (&nb..., Just bougt a fixed up 350 with casting nr 3970010 with 4 bolt mains, is this a LM1 or something else, Mikes page says a LM1 with casting number 3970010 os only a 2 …, The 010 block casting was a VERY common 4in bore block. It was MACHINED in both 2 and 4bolt configurations. The width of the registers (that's the gap in the main web where the caps fit), FOR A SB, is what determines 2 or 4bolt configuration. AND, ONLY the center 3 webs got 4bolt caps in in the SB. ANY (NOT just an 010) 4in …, If you’re in the market for a new or used Chevrolet vehicle, it’s important to find a reputable dealership near you. With so many options available, it can be overwhelming to choos..., Re: Engine Casting Block #3970010. 02-12-06 09:07 PM - Post# 873994. In response to joeysworld. The difference is the suffix code on the block. Could be a 145 HP 350 from a 1975 caprice. Could be a DZ 302. The difference is the code on the front of the passenger side. Just above where the water pump bolts., Details for 3970010; Manufacturer: Chevrolet: Category: Engine Blocks: Type: Small Block V8: Date: 1969-1980: Notes: 350, 2 bolt or 4 bolt, may be mistaken as 8970010: Added …, item 7 Chevy 350ci V8 SBC Engine Block 3970010 010 020 Std. Bore Chevy 350ci V8 SBC Engine Block 3970010 010 020 Std. Bore. $600.00. item 8 FINISH MACHINED 350 4-BOLT 3970010 ENGINE BLOCKS (READY TO ASSEMBLE ) FINISH MACHINED 350 4-BOLT 3970010 ENGINE BLOCKS (READY TO ASSEMBLE ), item 7 Chevy 350ci V8 SBC Engine Block 3970010 010 020 Std. Bore Chevy 350ci V8 SBC Engine Block 3970010 010 020 Std. Bore. $600.00. item 8 FINISH MACHINED 350 4-BOLT 3970010 ENGINE BLOCKS (READY TO ASSEMBLE ) FINISH MACHINED 350 4-BOLT 3970010 ENGINE BLOCKS (READY TO ASSEMBLE ), what problems will i face putting a roller cam in a 70's 350, 3970010? i am wanting to build an good, reliable, smooth, long lasting engine. i do understand a cam button will be needed. i would also like input for the combo i am thinking about. 355 sbc crane roller cam part 119811 204/214 @ .050, .429/.452 lift sbc L31 vortec heads, Re: Engine Casting Block #3970010. 02-12-06 09:07 PM - Post# 873994. In response to joeysworld. The difference is the suffix code on the block. Could be a 145 HP 350 from a 1975 caprice. Could be a DZ 302. The difference is the code on the front of the passenger side. Just above where the water pump bolts., How To Determine Whether Your Small-Block Chevy is a Builder or a Boat Anchor. By Tommy Lee Byrd – Photography by the Author. ... Common casting numbers for performance engines include 3970010, but ours reads 3956618, another great number to put in your memory bank. This means the engine could be a ’69 DZ302, a ’68-69 327, or …, When it comes to buying a new or used Chevy vehicle, finding a reliable and trustworthy dealership is key. With so many options available, it’s important to know what to look for i..., Mar 3, 2013 · Casting Number 3970010 Manufacturer Chevrolet Category Engine Blocks Type Small Block V8 Date 1969-1980 Notes 350, 2 bolt or 4 bolt . 75 Nova Custom 75 Nova Base. , May 15, 2008 · R. Ray J Neal Discussion starter. 26 posts · Joined 2008. #6 ·May 16, 2008. Based on the suffix TJA I found it is one of two motors. 1973, 160hp conversion cab truck, or 1979, 165hp forward cab w/ AT. Based on the 3998991 heads (1972/1973) I would think it is the 160HP model. So Pretty much LOW compression motor. , J. javamxcars Discussion starter. 7 posts · Joined 2006. #1 · Nov 16, 2006. I speak with a lot of friends , and the opinon is the same , the question is: the chevy block 3970010 with number 010 .020 is for the nickel ,ok is it for 1% tin and 2% nickel or is 10 % tin and 20% nickel ? Like. Sort by Oldest first., item 3 Free Shipping - GM Chevy 5.7 350 Short Block 1967-1979 3970010 w/ free hat! Free Shipping - GM Chevy 5.7 350 Short Block 1967-1979 3970010 w/ free hat! $4,890.00, item 2 1974 Small Block Chevy 350 SBC 3970010 E 10 4 010 4 Bolt Main STD 1974 Small Block Chevy 350 SBC 3970010 E 10 4 010 4 Bolt Main STD. $600.00 +$275.00 shipping. item 3 Free Shipping - GM Chevy 5.7 350 Short Block 1967-1979 3970010 w/ free hat!, General Motors said it has secured more than 110,000 reservations for its new all-electric Chevrolet Silverado, which includes reservations from more than 240 fleet operators, Chai..., chevy 3970010 engine block, c74133529 k0203 TYU, 333882 heads. I don't no if it run's, it turn's and has between 120 and 150 compression, s.b.c., sbc, SBC, Bring Cash,, No Tire Kickers,,,... S.B.C. 350 4 bolt motor core - auto parts - by owner - vehicle automotive sale - …, GM engine block # 3970010 was used as early as 1968 on some 327ci engines. From 1969-1979 it was a 350ci engine. It could be a 2 or 4 bolt block used in cars, trucks and even corvettes., item 5 GMC 3970010 CHEVROLET 350 4 BOLT MAIN BARE BLOCK W/ END CAPS .30 OVER OEM 1975 GMC 3970010 CHEVROLET 350 4 BOLT MAIN BARE BLOCK W/ END CAPS .30 OVER OEM 1975. $800.00. item 6 Brand New Replacement Main Caps (4-bolt conversion) for Chevy GM 350 (Set of 3) ..., All these are identified here. Quickly, A = Chevelle, F = Camaro, X = Nova. If you're looking at the engine code - this is already known. If you're looking at the casting # information and it mentions 3970010 "A/F/X/Y/B".... basically this means "it's used in everything", whereas if it simply states "Y"... this means Corvette. Decoding small ..., C3 Tech/Performance - 1970 LT1 engine number - My 350 engine has an engine number starting with CEC. The block # is 3970010. I ordered this engine new over the parts counter from a Chevy dealer in 1972. I thought it was a 1970 LT1, but the CEC prefix doesn't match up with anything I can find in the books. What does..., Fresh 69 Camaro Z/28 302 DZ complete engine. This is the real deal, black casting # 3970010 casting date E 14 9 (May 14, 1969), engine pad stamp code V0527DZ (May 27). Cylinder heads casting # 3927186 casting date E 27 9 (May 27, 1969). More pictures and details coming soon. This is a great complete engine. Real four bolt main, correct original ..., When it comes to buying a new or used Chevy vehicle, finding a reliable and trustworthy dealership is key. With so many options available, it’s important to know what to look for i..., Also forgot to mention this block was used for both 327 and 350 cubic in. motors. Became a 350 for 68 up in most Chev. lines. Block usually will have the 10/20 tin nickel content. However, it can come in either a 2 or 4 bolt main configuration. Generally the 010 blocks are good for making perfornance engines., GM may be replacing tens of thousands of Bolt EV batteries, but it won’t have to pick up the tab for most of them. The automaker has reached a deal that will have LG pay nearly all..., Fresh 69 Camaro Z/28 302 DZ complete engine. This is the real deal, black casting # 3970010 casting date E 14 9 (May 14, 1969), engine pad stamp code V0527DZ (May 27). Cylinder heads casting # 3927186 casting date E 27 9 (May 27, 1969). More pictures and details coming soon. This is a great complete engine. Real four bolt main, correct original ..., SBC 350 V8 ENGINE MOTOR BLOCK 3970010 2 BOLT MAIN SMALL BLOCK CHEVY 30 OVER. Pre-Owned. 1 product rating. $749.99. camaro-parts-world (26,333) 99.9%. Was: $999.99 25% off. or Best Offer. Freight. SBC 350 V8 ENGINE MOTOR BLOCK 3970010 4 BOLT MAIN MJ21800 MADE IN MEXICO GM 2. , Nov 1, 2013 ... If that happens to be the vehicle this engine is currently sitting in they "match". I'm Done. I can GUESS the casting # is 3970010 and check ..., from Pot hole infested Western, New York. Ok you have a 3970010 block, now look at the date code on the back of the block. If the date code is anything higher than 71 it is a 350. 68-70 it could be a 302, 327, or 350. The 302 block had additional stamping that read DZ, most likely it is not a DZ block.