If i have 10.8:1 with 5.3 heads, what would i have with 6.0 heads
#1
If i have 10.8:1 with 5.3 heads, what would i have with 6.0 heads
Hey guys,
Im trying to figure out how much i could get my compression to drop by simply changing heads.
I had my 418 motor built with nitrous in mind. It ended up being 10.8:1 with unmilled 5.3 heads. Im curious if i were to go with a set of 6.0 heads, or possibly another large chambered head, how much i could get it to drop.
Im trying to figure out how much i could get my compression to drop by simply changing heads.
I had my 418 motor built with nitrous in mind. It ended up being 10.8:1 with unmilled 5.3 heads. Im curious if i were to go with a set of 6.0 heads, or possibly another large chambered head, how much i could get it to drop.
#2
LS1Tech Premium Sponsor
iTrader: (5)
What size valve relief or dished pistons are you running? Also which head gasket to get to that 10.8:1. A few more specifics about the short-block will be needed to do the calculations correctly. From a 61cc to a 71cc will drop a 418 around 1 full point in static compression...but again, that's an estimate.
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
#3
I dont know the exact specifics on it.
The pistons have a very small dish to them, probably 2mm or so.
Im running the cometic gaskets, i think .051... been a while.
Im just trying to get a ballpark idea of what it would drop me to.
The idea of a big turbo is starting to get thrown around, and just curious if i would have to change pistons, or if a head change would get me by. The 418 only has like 500 miles on it so i hate to have to dig back into it, would seem like such a waste. My current 5.3 heads would be great on my TA.
The pistons have a very small dish to them, probably 2mm or so.
Im running the cometic gaskets, i think .051... been a while.
Im just trying to get a ballpark idea of what it would drop me to.
The idea of a big turbo is starting to get thrown around, and just curious if i would have to change pistons, or if a head change would get me by. The 418 only has like 500 miles on it so i hate to have to dig back into it, would seem like such a waste. My current 5.3 heads would be great on my TA.
#4
LS1Tech Premium Sponsor
iTrader: (5)
For a .051" gasket, 4.065" bore and 4" stroke and 61cc chamber, you'd have to have about 16cc worth of relief/dish for 10.8:1 SCR. Does that sound right to you??
If so, a 71cc chamber with another .051" gasket would net you about 9.8:1 SCR.
If so, a 71cc chamber with another .051" gasket would net you about 9.8:1 SCR.
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
#6
LS1Tech Premium Sponsor
iTrader: (5)
Same results from 4.03"x4.1"
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!