hirdlej

iTrader: (31)

Your motor is smaller too though. 20CID at higher RPM's may be enough to tip the scales. What heads are you running along with cam?

ap2002

iTrader: (8)

i believe he has patriot LS6 heads and 226/226 112LSA,

i am with rgvsierra, take it to the track and dial it in there, i believe alot of people get hooked on dyno #'s,

ap2002

iTrader: (8)

here is my dyno with the truck intake and ran a best of 12.4's, power stayed up there all the way to 7250rpm where my rev limiter is set at, thats why its hard for me to swap to a LS6 intake cause i dont think it will help any?

this is on a 05 LQ4, with stock heads, 226/226 112

BlackGMC

iTrader: (31)

Damn!!! That is one good running truck.... Look at that TQ curve....

TXsilverado

iTrader: (19)

ok now that anselmo posted the 6.0 on stock heads pulling to 7k, and my smaller motor with the same exact cam and P&P heads only pulls to 6500 before it plumits...

BlackGMC

iTrader: (31)

Do yall use the same tuner? Just tryin to rule that out....

ap2002

iTrader: (8)

same one...

BlackGMC

iTrader: (31)

Cool, that rules out the tuner...

TXsilverado

iTrader: (19)

same tuner, same gears, same converter, same cam,

the only real difference is our CI and heads.

hirdlej

iTrader: (31)

I think what we're seeing here is a trend that when the efficiency of the intake port is increased, we're actually cutting our own throats because no longer is the truck intake manifold "tuned" to the proper flow range in which the heads and cam are working. Plenum size needs to increase along with intake runner volume to maintain and keep up with the new flow intake. I would have been better off I think had I left the 243 heads alone. Now that I fubared the heads by having them ported I am going to consider porting the truck intake or upgrading to a TBSS intake, whatever is more efficiently priced.