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#1
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Identifying a DZ302
I've mentioned before that my Camaro's 302 lost an oil ring so I was going to take out that engine and build a 383 for it and sell the 302 block. I know the guys personally who built it back in the day and some other info that tells me the engine is an original DZ.
Also as I've stated, they decked the block and removed the engine pad stampings unfortunately. I've tried the police method of using acid to bring the numbers back but the stampings just aren't showing up. They must have either removed a fair amount of material and/or the stampings were a little light like others I've seen online. So my question: Are there any other ways to evidence that the engine is a DZ302? The casting number is consistent with the 1969 DZ block castings (3970010) and I've read that there may be a way to determine from the crank journals? I'm certainly not experienced in this area so I appreciate any information from you all who know a lot more about this than I do, thanks.
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1968 Camaro Ex-ISCA Show Car John 10:30 |
#2
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You could post your crank casting number. It should be an 1178. The vin will probably be on the raw casting near the bell housing & oil filter area...Joe
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1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO 1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E 1970 'cuda Moulin Rouge, 440-6, 4 speed |
#3
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The 302 and 350 blocks are the same. The only difference is that DZ stamped on the pad. Check the VIN above the oil filter to see if it matches your car.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed |
#4
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DZ is just a suffix code. I guess that told the assembly line to install a 3" stroke crank (1178) in that particular block.
I think the 010 blocks are suppose to have a little more high nickel content in them?? |
#5
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If the block was originally a DZ-suffix, it would have nodular main caps with '2482' on them, and there would be a 1/4" NPT oil gallery plug just above the timing chain cover from the machining/assembly at Flint. Even with those, that isn't proof of what it was originally assembled as.
The 'high nickel' or 'high tin' content on hi-po blocks is just a myth.
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Tim in NSW, Australia 1969 Van Nuys 04A Z/28 from Clippinger Chevrolet. Cortez Silver with dark blue interior. Ran at Lions Dragstrip and Pomona Raceway, with paint by Bob Kovacs of Fresno. Last edited by ZLP955; 12-04-2017 at 07:04 PM. |
#6
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I've had a bunch of 350 blocks with the 2482 bearing caps. If it has something other than the 2482 then that means it isn't a DZ block, but having those caps doesn't mean that it is.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed |
#7
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IMO , i don't think its a myth about the harder material content . It clearly states that the new design 1969 engine block has a new stronger construction , tougher cylinder block and extra firm bearing caps in this 1969 gm Camaro brochure. Either way you can draw your own conclusion. Thanks Marc.
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#8
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no difference in the 302 or the 350 blocks with the 4 bolt mains.
Blocks used were the 386,388,618 and 010. I believe after January of 1969??? the 010 block was available but not sure on the date. |
#9
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Quote:
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Freddie 1969 Camaro RS/SS396 (427) 4 speed |
#10
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Quote:
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65 Corvette Coupe L78 67 427/390 Vette Coupe unrestored 67 L-79 Vette roadster (Top Flight) 69 L71 Roadster Survivor 69 L46 Roadster Survivor (Sold) 69 Z/28 RS 69 Dodge Charger R/T 70 W30 442 Auto Air Survivor 2016 Z06 Coupe M7 70 AAR Cuda (Sold) 69 L78 Chevelle |
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