Technical > Matt Shaff's Engine Shop

Cam help and info.

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tcoupekyle:
I ran into this in my sbc blown build.
Had to custom order pistons from je. Big part of my problem was
64cc heads and a 406 with aluminum rods. Apparently that’s a
Weird combo. But I didn’t know at the time.

PS if your gonna order, order fast. I been waiting 11 weeks
On lifters and still no update on an ETA.

JEFF/21C:
I've encountered problems with low compression that was caused by miss matched parts. customer bought a 454 chevy froma "race shop" that never at the level it should have.He did a compression check after water got into the motor 90psi there was miss match of parts could have been, crank, rods or pistions  as the pistons didn't come to the top of the cylinder, I replaced the rods that worked with the crank stroke and pistons to get the proper deck height. the other was a 1947 Harley knucklehead el 61ci that a rebuilt was done and someone switch the cylinders with newer 74ci units, the 74 has a longer stroke resulting with pistons too low in cylinders had to have custom pistons made with a different compression height ( the distance from the top to the center of wrist pin,by JE

Chuck466:

--- Quote from: wideopen231 on April 21, 2022, 07:39:24 AM ---Stupid question. Have you checked actual cc's in combo? Actual not advertised. They rarely are the same. Not trying to be insulting just know how much difference there can be.

--- End quote ---

Yes sir these heads have been fully CNCD and chambers fully softened, I ran this exact combination as a Max effort nitrous combination, running a .070 copper head gasket to help get the compression down some..

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