PREDATOR-Z

Planning a 347 forged shortblock.

I do not want high CR, however I would like big flow LQ9 stage II heads.
So my question is: Would it be better to have?

1- 59 CC heads with dish pistons (Diamonds)
Or
2- Flat tops with 67 CC Heads

I plan to shoot up to 150 N20, max 200 if need be.

Also this would be with a high lift cam, possibly a G5x3

jrp

iTrader: (16)

what compression range are you looking for. i have diamond domed pistons myself . i assume with either dished or domed you'll run vavle reliefs?

PREDATOR-Z

10:1>>> 10.5:1

Do you think the Dished would be less prawn to detonation for Nitrous? assuming CC's are fully polished and free of hot spots.

PREDATOR-Z

Ttt...

BOWTIE

I would say use which ever one (combustion chamber) that flows the best. Traditionally that would be the slightly larger chamber as it would unshroud the valve better, but you could check with the head guy and most likely find out. If he does not know exactly, have him flow test both with a tube to simulate your stock bore.

jrp

iTrader: (16)

had i not gone with domes i would of run your second setup; flat topped with a ~66 CC.

PREDATOR-Z

Thanks JRP,

I was thinking the same way.