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Re: Are all 502's Aluminum cyl case & heads ?
Nope -
What about 2003-2004 vintage 502's ? *NM*
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Re: What about 2003-2004 vintage 502's ?
Hi Doc
I don't or didn't think any 502 cube aluminum blocks engines are/or were made by GM. Only the Zl-1 blocks are aluminum ,max rated @ 750 hp
I know the crate engines/kits sell with the semi/open oval port aluminum heads.
Donavan or Dart type aluminum blocks would go over 500 cubes.
Frank
25 years of use of many of your parts
Thanks.............
try ...........
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No Frank: THANK YOU ! *NM*
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Re: What about 2003-2004 vintage 502's ?
Geoffrey-----
I agree with Frank. A 502 is a SERVICE-only big block engine configuration. It uses a 4.470" bore and a 4.00" stroke (same as 454 cid engines). Because of its larger bore size, it uses a block which is different from 454 blocks, none of which can be bored to this bore size. All 502 blocks ever made by GM have been Gen V or Gen VI type blocks, all are cast iron, all have siamesed cylinder walls and none have provisions for a mechanical fuel pump.
The only aluminum big block ever available from GM has been the "ZL-1" type block. A big bore version of this block was used for Can-Am racing in the early 70s. However, this version is long-since out of production. It was designed around a very large bore and short stroke to produce 430 CID. This block could also use a longer stroke crankshaft to produce a very large displacement.
The current "ZL-1" block, which is a Mark IV block design with certain Gen VI enhancements, cannot be overbored to 4.470" bore size. However, it can be used with up to a 4.375" stroke. So, theoretically, an engine could be built using it with about a 500 cid displacement. It wouldn't be the same bore and stroke configuration of a 502, though.
Sometimes, a 502 is confused with the relatively new 8.1 liter (496 cid) big block which is also known, officially or unofficially, as a Gen 7 big block. The 8.1 is a PRODUCTION engine used in trucks and marine applications. This engine uses a 4.250" bore (same as 427/454) and a 4.375" stroke to yield its displacement. ALL PRODUCTION and SERVICE versions of this engine use cast iron block and heads. No aluminum heads or block are available from GM for this engine at the current time. It is this configuration that the current "ZL-1" block could be built to, but such a configuration of a complete engine is not available from GM.In Appreciation of John HinckleyComment
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Re: What about 2003-2004 vintage 502's ?
Original 502 bore is 4.466" but aftermarket pistons start at 4.47". I'm currently building one of these motors and had to hone the block to 4.47" so I could use the 4.25 stroker pistons. My block was a new unused casting and originally did not have the final hone from the factory and was only 4.464"
The Can Am ZL1 block had a 4.44" bore.Comment
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