Great Bend Stock DQ

[Mark Lewis]

I believe wheelbase specs are in the classification guide on the left hand side of the page.Heads can vary by 2-3 cc's during production. I have found this on many of the crate motor heads that are new from the factory. I know most hate crate motors, but if this is happening now, imagine what it was 30 years ago at the foundry with less sophisticated mfg procedures. Just my .01 worth. Spent the other penny on gas lol.
Mark

[SSDiv6]

Originally Posted by Mark Lewis

I believe wheelbase specs are in the classification guide on the left hand side of the page.Heads can vary by 2-3 cc's during production. I have found this on many of the crate motor heads that are new from the factory. I know most hate crate motors, but if this is happening now, imagine what it was 30 years ago at the foundry with less sophisticated mfg procedures. Just my .01 worth. Spent the other penny on gas lol.
Mark

Yes, in the early days, core shift was a big problem at foundries. If you are getting that much variation on the crate cylinder heads with todays technology, what can you expect from early OEM castings?

[seb]

Guys:

I have a CNC cylinder head business and have seen variances that you wouldn't believe.
The newer aluminum heads don't vary nearly as much as cast iron but they do vary alot.
I use to run a 428 Cobra Jet Mustang (many years ago) and have seen those heads vary
as much as 6-9 ccs.

S.E.