Quote:
Originally Posted by mgarblik
Agree with you. I have Ross pistons in a similar build with .006" piston to wall. Very little slap cold. It's a solid flat tappet cam and valvetrain noise is mostly what you hear. A real SD-455 is much louder with that wall clearance, must have to do with the alloy used and expansion rate or the cam grind shape on the skirts. You can really hear them slapping around in there! Beautiful noise.
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When I was assembling the engine and using a piston to square up the rings for file fit I stuck a a piston in upside down and kinda freaked out.
The clearance was HUGE. I thought the machinist made a big mistake. I forgot the tops of pistons are smaller for heat reasons, measure at the skirt.
So I grabbed a roll of masking tape and used it to square the rings up.
Not worth the risk of dropping a piston and having to deal with whatever damage happens.
I know a fella who assembles engines in a area of his shop with plywood over his cement floor. Think I will do the same with new shop.