Dished or flat tops
#1
TECH Senior Member
Thread Starter
Dished or flat tops
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
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
#3
TECH Senior Member
Thread Starter
Originally Posted by jrp
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?
Do you think the Dished would be less prawn to detonation for Nitrous? assuming CC's are fully polished and free of hot spots.
#5
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Join Date: Jan 2003
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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.