Max lift for heads
01-20-2006, 08:44 AM
#1
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Max lift for heads Im going to be utting A set of ported 5.3 heads on a 5.7 motor. They have the stock valve size. What is the highest lift cam i can use without having to cut the piston or messing with the heads?
Also, will the ported 5.3 heads make the engine lose power over a set of stock 5.7 heads?
Also, will the ported 5.3 heads make the engine lose power over a set of stock 5.7 heads?
01-20-2006, 09:16 AM
#2
TECH Senior Member
1-Properly ported 4.8/5.3L heads will definately add power.
2- LIFTS have practically very little to do with PTV clearance. Durations and Valve Events are what you have to watch for.
2- LIFTS have practically very little to do with PTV clearance. Durations and Valve Events are what you have to watch for.
01-20-2006, 09:21 AM
#3
!LS1 11 Second Club
Max lift along with duration (at a certain valve event time) is what you need to be concerned about. Look a the TRak, it's .640 on the intake.
Anyhow, porting a set of 5.3's is a good idea, as you will gain compression.
The key thing is getting a good set of 5.3's from a porter that knows his stuff.
It's probably less expensive to purchase a set of 5.3's (or even a set of 243s) outright from one of the vendors than to have someone port them for you.
Anyhow, porting a set of 5.3's is a good idea, as you will gain compression.
The key thing is getting a good set of 5.3's from a porter that knows his stuff.
It's probably less expensive to purchase a set of 5.3's (or even a set of 243s) outright from one of the vendors than to have someone port them for you.
