Originally Posted by
Hog
Thanks for sharing Fast. Those headpipes and cam must really wake the L31 up.
The difference is huge.
HD truck pipes on left, stock 1/2 ton truck pipes on right. Look at the tiny 1 7/8" pipe that gets crimped WAY down in those bends.bends
This pic shows the bad crimp bend in the bank 1 pipe
Do your headpipes curve over to the passenger side like the pic? I have seen some van pipes that look like they head straight back from the exhaust manifold.
I'm happy to finally see an L31 grunted down to such a low rpm. I'd like to see a 5.3 during the same testing procedure.
How do you like the LT4 production cam compared to the L30/31 cam? Looks like it would work great for me.
I know of a guy running a Vortec 350 2462 1hkr LT Hooker headers, ZZ4 cam, PCMforLess dyno PCM tune and is only nabbing 255rwhp in an ecab 2wd over on FSC. He runs a Yank 3600 stall and tickles the 13's NA and mid 13's with a 50hp dry shot. He would be very jealous of your results.
Youve got a very nice setup there Fast, using all GM parts. That setup should be very durable.
peace
Hog
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