sac

iTrader: (4)

I'm running a 402 stroker with wiseco -8cc R/dome pistons, 6.125 scat rods,eagle crank,tsp's prc.stg.3 heads with 2.08-1.60 valves, milled .10 for a 64cc chamber.running a .40 cometic gasket to get 11:4 compression and running a ms4 in their.Will their be any clearance issues?Let me know guys thanks!

bigdsz

iTrader: (1)

Erik is building me a 408 Callies crank and rods, Comp XER 244/248 .612/.615, 5.3L heads milled .022 to 63cc. with Weisco -10cc custom pistons. You shouldn't have PTV issues because of the valve reliefs, just be sure to degree and clay. I would be somewhat concerned about the 11.4 SCR. I was going to use the -8cc Weiscos but I didn't want a 11.4 SCR since a friend of mine recently nuked his engine from too high a CR, so I decided to go with the custom -10cc to keep the CR at about 11.1.

mr2guru

iTrader: (16)

Don't plan your engine build on anecdotal evidence of an engine failure that could have so many variables besides outright static compression.

I'm coming up with a rough estimate of a 8.4-8.5 DCR, depending on the gasket you use, from your info. That is the sweet spot for premium pump gas.

JPH

iTrader: (2)

you got releifs, so you should have plenty of clearance.

sac

iTrader: (4)

yes it has valve reliefs and should I degree the cam or should I leave it alone and I havent milled the heads yet.Should I get them milled or is it not even worth it just to be safe.

prplhaz

Yep, oh so true and ditto on the DCR!

PREDATOR-Z

Man I run 11.88 SCR on premium with no issues (and I shoot with dry on top)

SCR is not the source of engine failure unless he had a tiny cam with 9+ DCR and tons of detonation.
If that is the case the detonation and his stupidity was cause of failure.