Cam swap
10-21-2015, 09:20 PM
#2
stock pushrods are standard LS 7.4"
Duration @ .050 193/193
Lift @ Cam .482 Non DoD Lobes/.490 DoD Lobes Intake and Exhaust
Maximum DOD lift is .525 @ the cam
the 243 heads are standard LS6 heads, 2" intake valves and 1.55" exhaust valves
Duration @ .050 193/193
Lift @ Cam .482 Non DoD Lobes/.490 DoD Lobes Intake and Exhaust
Maximum DOD lift is .525 @ the cam
the 243 heads are standard LS6 heads, 2" intake valves and 1.55" exhaust valves
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10-22-2015, 08:15 PM
#9
you are crazy, the LS4 doesnt have enough cubic inches for a cam that large, not to mention the heads, intake and intake piping dont support flow for something that large. Your valve springs wont support it, nor will your lifters. You will have to take the engine apart to support a cam that large and build the motor up. Not to mention you would need like a 4000 stall and rev to 7-7500 with that kinda duration.
10-22-2015, 08:34 PM
#13
Generally speaking, most cam manufacturers wont recommend anything over a 220 duration on either end on any "stockish" 5.3 engine, regardless of RPO code. I've seen 5.3's running slightly larger cams like TSP 224R's and such but even then, they have to be stalled pretty high and rev pretty high and you usually sacrifice a ton of low end that is already lacking as it is on 5.3 engines compared to other LS displacements. OP is essentially building a D series honda engine with 8 cylinders. lol
10-22-2015, 09:19 PM
#15
10-23-2015, 11:46 AM
#19
Originally Posted by spawne32
Generally speaking, most cam manufacturers wont recommend anything over a 220 duration on either end on any "stockish" 5.3 engine, regardless of RPO code. I've seen 5.3's running slightly larger cams like TSP 224R's and such but even then, they have to be stalled pretty high and rev pretty high and you usually sacrifice a ton of low end that is already lacking as it is on 5.3 engines compared to other LS displacements. OP is essentially building a D series honda engine with 8 cylinders. lol
10-23-2015, 07:03 PM
#20
OP's cam is way too big for a 5.3L.
My 224/232 is a little large and peaks at 6800 rpm. It has pretty much the same torque at 2000 rpm as it has at 7000 rpm, and is about 50 lb-ft less than peak (335 lb-ft)... manual transmission, so all pulls are in 4th.
A better matched cam for my particular combo would be a 222/226 .604/.604, and I will likely switch to it over the winter.
My 224/232 is a little large and peaks at 6800 rpm. It has pretty much the same torque at 2000 rpm as it has at 7000 rpm, and is about 50 lb-ft less than peak (335 lb-ft)... manual transmission, so all pulls are in 4th.
A better matched cam for my particular combo would be a 222/226 .604/.604, and I will likely switch to it over the winter.