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Interesting, thanks. I'm also looking into using Line2Line coating on the skirts of my current pistons to re-set the clearance perfectly. I could do the work myself, which is great when just shipping engines in and out of Alaska is ~ 2 grand.

Too bad to hear you're not accepting work but I understand. If you're comfortable suggesting a machine shop/builder I'd love to hear it. Many thanks for the recommendations regarding how to best utilize the piston, I'll make sure I understand everything you are suggesting and discuss with...

I agree on the "no free lunch," and I'm slowly figuring out exactly what's important to me. Just to be clear, my motor has slap at idle when hot. I'd rather not have slap when cold, but if that were all it was, I would not worry about it at all. Thanks for the info above regarding piston...

Challenger340, Thanks for the reply, I was hoping you'd chime in. The pistons are listed on page 25 of this older KB catalog: https://issuu.com/tmeyerinc/docs/new_combo_premium___fhr_forged_catalog_2008 You are correct, they are 2618 alloy. I'm curious if they are also "short skirt"...

The pistons in the engine are KB840s, "premium forged," sorry if my post wasn't clear. I sure wish I was smart enough to have confirmed what clearance my builder used. KB says 0.0045-0.0055 for a stroker.

Interesting, I understood the same about piston slap (basically only when engine is cold). I thought it was the fuel pump/rod (I listened to it with a scope and it was knocking very loud) but changed both and still have the noise. I'm really going make sure I get the right cam next time...

So I take it the roller is probably quieter that a standard flat tappet. Thanks for the reply.

Maybe it is the cam as you suggest, heck I think I have both, the knock came on over the summer, and what I believe to be valve train noise has been pretty constant since I had the motor built. I really should have done more homework before I had the engine redone, but also sometimes you don't...

Very interesting, I'll do the research you suggest, thanks!

Hello FBBO, I've been on various threads regarding piston slap (e.g., thread "440 knocking") where guys are sharing really great hard to come by knowledge. The mildly cammed, stroked 440 in my restored 69 RT street car seems to suffer from it, and I want to be very sure I understand how to...