ls1 heads on a 5.3l... good for boost?
02-06-2009, 07:05 PM
#1
ls1 heads on a 5.3l... good for boost? Im pulling the heads off my motor and was gonna have them cleaned up. Well i have a line on a set of ls1 heads with stainless valves, cleaned up the ports and bowls and better springs, no mill work so stock size chambers. If my compression is 9.8-1 (i think thats stock 5.3 size) what would ls1 heads drop me down to? In turn ill be able to boost more? Or just rock the stock 5.3 heads?
02-07-2009, 04:06 PM
#2
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Normal lm7 lm4's are 9.5 to 1 with 61cc heads. Going to the ls1 64cc chambers would drop you down to around 9.2 to 1. Assuming you keep a .057 headgasket. I'm using a 5.3 for my project(aluminum lm4) using 5.3 heads from patriot cut down to 59cc's and a .027 headgasket which should put me around 10 to 1. 9.2 to 1 is plenty for off boost driving.
HTH
HTH
02-07-2009, 04:15 PM
#3
thats good, not too much compression drop but a little more will help with boost. I have a line on a set from a engine builder who builds my buddys motors and hes giving me a hell of a deal with bigger stainless valves and cleaned up ports and bowls so then no hot spots eaither. AND comes with a valvetrain already too. The set for $400 complete.
