5.3/5.7/6.0 heads
02-10-2006, 06:59 PM
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5.3/5.7/6.0 heads I did a few searches but couldn't come up with the answers Im looking for.
Please correct me if Im wrong.
5.3 heads raise compression, which is BAD for FI motors.
6.0 heads lower the compression which is GOOD for FI.
Does the PTV clearance change with 5.3 heads?
Do 5.3 heads raise tq/hp through the entire powerband?
Will 6.0 heads lower the tq/hp without FI?
Which head is the best to spray NA only?
Pro/cons of each head please.
Thanks!
Please correct me if Im wrong.
5.3 heads raise compression, which is BAD for FI motors.
6.0 heads lower the compression which is GOOD for FI.
Does the PTV clearance change with 5.3 heads?
Do 5.3 heads raise tq/hp through the entire powerband?
Will 6.0 heads lower the tq/hp without FI?
Which head is the best to spray NA only?
Pro/cons of each head please.
Thanks!
02-11-2006, 01:14 AM
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Specs
The link above will help you with compression and valve info...I don't know about P to V on the 6.0, but the 5.3 valves sit about .030" closer to the piston than 5.7 LS1 heads. So they're like a set of LS1 heads milled .030" except the valve train geometry is still correct. The ports and runners are the same on the 5.7 and 5.3.
I agree on your concept, 6.0 would be good for FI and 5.3 with bigger valves are good for high compression NA motors.
You can make more power with FI, but there's nothing like a good ole lumpy high compression muscle car.
The link above will help you with compression and valve info...I don't know about P to V on the 6.0, but the 5.3 valves sit about .030" closer to the piston than 5.7 LS1 heads. So they're like a set of LS1 heads milled .030" except the valve train geometry is still correct. The ports and runners are the same on the 5.7 and 5.3.
I agree on your concept, 6.0 would be good for FI and 5.3 with bigger valves are good for high compression NA motors.
You can make more power with FI, but there's nothing like a good ole lumpy high compression muscle car.
