While discussing engine stuff last week with local machine shop guy we got into seat pressures

I think a lot are running way more spring pressure than required to control valvde train. I agree too little is bad but at same time think running a butt load over required is equally bad.

I run lighter side valvetrain with Titainium valves, retainers and locks. Pushrods are on stiffer side and niot lite and rooler lifters are Brad miller and figure decent on weight;

I think half issue had with lifters is spring related. Hell we found few 200 lbs in springs after one run that banged blower at 8800 rpm and did not find out till next run at same rpm.Where new springs recommended by BAE for their heads is why not looked at after first run. telling me you can run slightly higher at rpm range seen in bracket car with no issue., Hell add in we did have 52 lbs boost also.

While looking at seat pressure and remembering hardest part of cycle to comtrol is max lift where changing velves direction. Do we really need near over 800 or close to almost 1000 lbs pressure? That on a 300# seal, Not sure what have with 700# seat I have heard from others.Not bat eye at motor hitting 9000 as is, Use to shift at 10.5k with blower making 52 lbs running 350 seat new and then shim for next run and trash after that. yea spring have gotten better.Plus changing springs on head with hand pulled compressir is PIA when get over 400LB,LOL

So what you run? if over 359# please state why feel need for that much. Like havey valvetrain or over 8500 rpm.

This message has been edited. Last edited by: wideopen231,