Johnnie, you need to understand that the Poly engines have negative
deck height pistons, compared to the Hemi pistons, which are
physically taller, and have valve reliefs on their combustion surfaces.
Installing the Hemi's physically larger combustion chamber onto a
Poly engine block will seriously reduce the Poly's compression ratio.
I'm too lazy to look up the 56's C.R.'s (the 57's were 9.25 and 8.50
respectively), so merely installing the voluminous 56 Hemi heads onto
a 56 Poly engine is not a good thing, for performance or MPG.
Nobody ever does this, but the "440" version of the 57 Hemi would
involve installing 'worked' Poly heads onto the Hemi engine!
Fortunately, confirming a fake/cloned D500 is as simple as looking
at the engine stamping numbers.
A 56 Poly will be stamped "D63-1XXX" and a 57 Poly is stamped
"KDS-1XXX".
Neil Vedder
On 11/21/2012 8:40 AM, Jonnie wrote:
I need a pair of 315 hemi heads----solid lifters---solid lifter valve covers---also plug covers----is anyone reproducing the valve covers---plug covers- ?----I am building a 315 hemi using the poly block----THANKS------Johnnie Slayton
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