Anyone running >.532" lift on a production motor?

[Intercooler]

Just curious. Just wondering how much can be ran before problems start to arise?

 

[REDS HOT AIR]

.532 lift

guides better be cut down or retainers will hit

 

[Intercooler]

I have that addressed Just wondering what the next problem to overcome will be.

 

[BoostKillsStres]

Probably want to look at rocker arm to valve stem contact point in an over the nose cycle to make sure you don't get out to the edge too far.

 

[Lee Thompson]

lift

I/m running .520 lift on exhaust side with production heads..500 on intake--- the guides were already machined down. Using Comp Cam 941 spring. This is getting close to max.

 

[gnx7]

I'm running a new setup on the car for a few months now:

PTE 218R flat tappet cam with 1.65 T&D's on "8445" ported production Champion heads.....

with a 1.50 rocker arm the cam is spec'd at .478/.481" lift.

with a 1.65 T&D the cam is .549/.553" lift unless my calculations are incorrect. No problems as of yet.

I'm still running the stock turbo.... and I don't think it works very well with this huge cam as the car isn't running as fast as before with a KB 208/208 .460" lift cam that was just as noisy.

-GNX7

 

[ijames]

Someone told me (can't remember who, sorry :-() that about .530 is where you have to start getting nervous about valves touching the stock pistons, as well as the guide-retainer stuff and coil bind that others have mentioned. A little clay would give a lot of peace of mind if you will have the heads off when the cam goes in.

 

[KIDDBOOST]

I run a 218 roller w/ .536 lift..ported iron TTA heads and no probs for over 3 yrs.(well, valve train thats is)