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#1
04-13-2010, 08:43 PM
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ZL-1 block versus Can-Am block?
A hot rod acquaintance has a 1969-1970 vintage Aluminum BBC motor. He claims it came from Bill Jenkin's shop many years ago and has just been rebuilt. I assumed it was an over-the-counter ZL-1 block but he referred to it as a "Can-Am" block. Are these the same blocks? If not,what are the differences?
He said the Can-Am block was used by Jim Hall in the Chapparal program. Any thoughts? Thanks- DandyDon 
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#2
04-13-2010, 08:51 PM
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Re: ZL-1 block versus Can-Am block?
Off hand, the Can Am block should have a larger bore (sleeve) size -- 4.440-inches versus 4.25-inches for the ZL1. The original Can Am engine was built with a short stroke (3.47...I think, but I'm getting old) for a final displacement of 430 cubic inches, but that changed quickly.....a 4.0-inch 454 crank produced a 494. And as we all know, there's "no replacement for displacement" <g>. IIRC there are other differences, but that's the big one.
Wayne
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#3
04-13-2010, 09:12 PM
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Re: ZL-1 block versus Can-Am block?
Jenkins did run CanAm blocks...is there truth to where it came from?.
What's the casting #?. Is there a provision in the block for a mechanical fuel pump?. Lance 'midyr' on this site may be able to share some insight as he ran a few of these blocks back in the day and ended up w/ what was left of Geo. Eaton's CanAm stuff..  ~ Pete
__________________
I like real cars best...especially the REAL real ones!
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#4
04-13-2010, 09:23 PM
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Re: ZL-1 block versus Can-Am block?
I don't think the Can-Am blocks had any provisions to mount a fuel pump on the block either.
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...................... John Brown This isn't rocket surgery.....
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#6
04-13-2010, 10:33 PM
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Re: ZL-1 block versus Can-Am block?
The motor that was in my 70 Camaro was a Can Am motor. Dave libby told me that it was. The pictures taken in 1970 prove that. The block had no winters flake on it and has a fuel pump where the fuel pump mounting boss is.
 
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Jake is my grandson!!
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#7
04-14-2010, 03:32 AM
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Re: ZL-1 block versus Can-Am block?
I have a NOS GM Can Am camshaft that is also from Bill Jenkins shop. The most radical cam ever made by GM!
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1968 Z/28 34,000 mile, born with engine and trans, Shipper, California car, Fathom Blue, deluxe interior, M21, 3.55 Posi 1962 Oldsmobile Jetfire, Factory all Aluminum V8 Turbocharged and Methanol Injected TURBO ROCKET engine, 4 speed Hydramatic, 4 link rear suspension, 3.36 differential, California car, PS, PB, PW, AC, Jetfire 2 option package.
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#8
06-26-2018, 08:36 PM
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ZL1 blocks were cast by Winters under two part numbers; 3946052 & 3946053. Production ZL1 Camaros can have either. Yenko did not change it.
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#10
06-27-2018, 12:40 AM
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I have had 2 big bore blocks and both were 052 casting and externally identical to a 4.25 block.
Jason
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