Re: LS (sub<)300HP What is needed?
 

Was the leaning out due to bad tune, because theres no way 216hp will max out 450s even with a stock fuel pump.

Re: LS (sub<)300HP What is needed?
 

Just because you CAN spin it up to 8 grand on a stock cam doesn't mean you're still building power.

Re: LS (sub<)300HP What is needed?
 

Granted my valves were adjusted a bit lose, and my engine has seen better days, I set my limiter to 7200 because at 7500 I was experiencing valve float. Scary stuff at the top of 4th gear. Not saying all LS's are like that. Just mine. Ive always been under the impression that 8000rpms is the dangerzone for kicking out rocker arms?

Re: LS (sub<)300HP What is needed?
 

Yes that is entirely true but shifting into 5th at the drag strip really hurts times.I think any more then 7500 on a stock LS head is asking for trouble but i think the rocker arms dont become a issue till 8500ish provided you have cams and springs.

Re: LS (sub<)300HP What is needed?
 

See my tuner(who is very reputable in our area) told me that I was maxing out my stock fuel pump. Above 6k he said that he was adding fuel but it was maxing out some where. I got 450s so must be the fuel pump. Could I ge a a FPR to compensate for this???

Re: LS (sub<)300HP What is needed?
 

Just run external fuel pump , no need to ---- woth them nasty FPR's.