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Old March 29th, 2010, 04:40 PM   #1
chevyk10
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Default Chevy 302?

I overheard a few guys talking about a Chevy 302 motor the other day, and that they're worth alot if you can find one since Chevy only made them for 2 years until Ford sued them in 69. My friend bought a Chevy K5 blazer and we couldn't figure out what motor was in it for the longest time. He just took it up to a shop and the mechanics told him its a Chevy 302 (its definitely not a 305) Anyone know if these motors are worth anything or what one would sell for?
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Old March 29th, 2010, 04:48 PM   #2
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I overheard a few guys talking about a Chevy 302 motor the other day, and that they're worth alot if you can find one since Chevy only made them for 2 years until Ford sued them in 69. My friend bought a Chevy K5 blazer and we couldn't figure out what motor was in it for the longest time. He just took it up to a shop and the mechanics told him its a Chevy 302 (its definitely not a 305) Anyone know if these motors are worth anything or what one would sell for?
Depending on if its a DZ302. Those are the ones worth the money. Some people have made there own 302, thouse ones aren't worth much.

The DZ302 has a forged crank and a 350 or 327 block.

You can make a 302 with a 350 or 327 block and a (i beileve) 283 V8 crank. But those cranks are cast.

See if the crank has numbers stamped into it or casted. That will tell you cast or forged.

Some die hard Z28 guys will try a life time to track down the matching numbers 302 that came in there car.
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Old March 29th, 2010, 04:51 PM   #3
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Depending on if its a DZ302. Those are the ones worth the money. Some people have made there own 302, thouse ones aren't worth much.

The DZ302 has a forged crank and a 350 or 327 block.

You can make a 302 with a 350 or 327 block and a (i beileve) 283 V8 crank. But those cranks are cast.

See if the crank has numbers stamped into it or casted. That will tell you cast or forged.

Some die hard Z28 guys will try a life time to track down the matching numbers 302 that came in there car.
To my knowledge all 283 cranks are steel. They never made a cast 283 crank. 283 crank/327 small journal block to make a 302. 283 was never made in large journal.
302 engines are rare, and you are correct the DZs are worth $$$.

Are you sure it is not an old 307 Chevy? They were used in the early 70s and are often mistaken for a 302. And no I am not talking about a 307 olds.
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Old March 29th, 2010, 05:04 PM   #4
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To my knowledge all 283 cranks are steel. They never made a cast 283 crank. 283 crank/327 small journal block to make a 302. 283 was never made in large journal.
302 engines are rare, and you are correct the DZs are worth $$$.

Are you sure it is not an old 307 Chevy? They were used in the early 70s and are often mistaken for a 302. And no I am not talking about a 307 olds.
Its a possibility that it could be a 307, I'm gonna look into it more. I mean who would really wanna put a 302 in a blazer anyway? Its a pretty nice truck but it doesn't make much sense.
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Old March 29th, 2010, 05:08 PM   #5
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Chevy made a 302 in order to race in production Trans Am racing. The engine Volume limit was 5.0 liters, hence the 302.

There are not many out there because they only made enough to homolegate (sp?) the race cars.
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Old March 29th, 2010, 05:27 PM   #6
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Post casting numbers of the block.
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Old March 29th, 2010, 06:38 PM   #7
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if you can rev it to 8000 rpm and still make power it's a 302. i highly doubt you have one. no one would be stupid enough to put a high strung engine like that in a big truck.
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Old March 29th, 2010, 09:21 PM   #8
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if you can rev it to 8000 rpm and still make power it's a 302. i highly doubt you have one. no one would be stupid enough to put a high strung engine like that in a big truck.

I wouldn't put it past some folks. when I worked at the dealer I saw all kinds of odd combos. the guy I learned my machine shop skills from had a bunch of 302s back in the day. they were junk. they needed stainless valves from the get go, most people over rev'd the shit out of them and broke exhaust valves wiping out most of them. for what I know the `68 blocks that exist are 2 bolt mains. they are not as sought after, but they are not bad for resto work. the `69s were the 4 bolt blocks. as for cranks I can't say for sure. the configuration was a 4" bore x 3" stroke. the one odd ball is a `68/69 327. if you can find the right ones they had a few that had the large journal cranks and could be swapped into the same block as 350s. so you could in effect make a 327 4 bolt if you had the parts.
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Old April 2nd, 2010, 05:57 PM   #9
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My friend had a 80ish K5 in primer grey that was full time 4wd with a DZ302. He bought it and sold it that way. Tried to get him to sell me the 302 but he wouldn't
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Old April 2nd, 2010, 08:50 PM   #10
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casting numbers
http://www.mortec.com/castnum.htm
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Old April 2nd, 2010, 10:26 PM   #11
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Casting numbers will help, But a 302 is based on a 327/350 block. You need to measure the stroke of the crank. Thought I struck gold once, Ended up being a 1969 350.
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Old May 2nd, 2010, 10:52 AM   #12
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ok... the 283 and eraly 327 (pre 68) have the small journal cranks.. and all the cranks are steel... so you can build a small journal 302 easily and fairly cheap (i'm thinkin bout making my 67 327 into a 302 for a low slung S10 project actually) the 307 and 327 have the same stroke.. the 302/327/350 all use the same 4in bore block... so any 305 block with a 307 crank is actaully a 327.. BUT... all 307 cranks were cast units.. which is not a big deal for most street applications.. there is a way to build a mordern 302 also... you use a 1 piece rear main 350 block and use the crank from the weird caprice v8's from the mid 90's.. i forget exactly what size they were BUT.. they were the same stroke as a 302 or 283.. aren't chevy's great? haha everythign swaps inot everything else.. and as for saying something is a factory DZ302... you'd better hope the block was never decked.. if it was the VIN info was removed.. the 350 and 302 used the same casting # block..
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Old May 2nd, 2010, 07:01 PM   #13
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370, the engine your trying to remember that was the "weird Caprice engine?" it was 4.3 tune port. it was a 267 same as the old 267 they made in the late `70 early 80's
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Old May 2nd, 2010, 08:01 PM   #14
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thanks yetti... i wanted to say 4.3 v8 but that just didn't seem right to me when i was typing that.. but yeah.. thats the same stroke as a 283 and 302.. so if youi want a modern style one piece rear main 302 that the way to do it..
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Old May 3rd, 2010, 11:49 AM   #15
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If I were restoring something to original and it had to be a 302, fine, but why would anybody want to "build" a 302???
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Old May 3rd, 2010, 01:49 PM   #16
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for a light vehicle a 302 is bad ass.. solid lifter cam short stroke big bore = insane rpm capabilties.. not good for a crawler or mud truck... but for a vega with a 4 speed and 4.56 gears.. the 302 would RIP!
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Old May 3rd, 2010, 01:51 PM   #17
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If I were restoring something to original and it had to be a 302, fine, but why would anybody want to "build" a 302???
funny.. samee thing peopel said about my little 327 i had in my street car.. all i heard was "dude just build a 350 that 327 won't touch a 350"... guess what... i made alot of the "build a 350" jackasses eat thier words..
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Old May 3rd, 2010, 02:03 PM   #18
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funny.. samee thing peopel said about my little 327 i had in my street car.. all i heard was "dude just build a 350 that 327 won't touch a 350"... guess what... i made alot of the "build a 350" jackasses eat thier words..
I know what you mean! I did the same thing with my 327.
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Old May 3rd, 2010, 03:32 PM   #19
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Obviously you can always build a smaller motor to make more power, but I've never been a fan of destroking an engine.
Put the equal to parts on a larger ci engine, and you're going to make more power. I'm just not a fan of taking an engine and making less ci from it.
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