MIKELMOTORCYCLE3398

iTrader: (3)

I need your EXPERIENCED opinion on this and not "upgrade your cam blah blah".
How much can I mill my 317's? Goin on a stock bottom end 00' 5.3L with a gm hotcam on .550 lift 219/228 .550/.550 112lsa. Keeping stock valve size. Do u think .030 off will be ok without PTV issues?

bowtieboySS427

iTrader: (23)

I think you'll be absolutely fine. But always measure. I think somewhere around .050-.060 you'll have intake alignment issues. I'm betting with that cam installed right will be no problem.

A.R. Shale Targa

iTrader: (2)

how bout change your heads...LOL; you'll likely have to mill them 70-80
thousandths just to restore the factory 9.5 compression ratio or are you
intentionally trying to lower it for a turbo application ????

bowtieboySS427

iTrader: (23)

And the Hot cam is .525/.525 on lift unless you got something different than what I have

MIKELMOTORCYCLE3398

iTrader: (3)

I got it ground to .550 lift when i had it made, and yes a FI application is in its future.

MIKELMOTORCYCLE3398

iTrader: (3)

Thanks guys

PREDATOR-Z

Lift at .050 has nothing to do with PTV clearance.

erickcastillo95

iTrader: (1)

i think you should be good with 30 over i have a friend running 317s milled 30 over on an lq4 with a 228r cam and there is no ptv issues

01ssreda4

iTrader: (96)

What compression are you trying to maintain. I guess I don't follow the how much can I mill but i need to keep compression low for FI later.....What are you trying to accomplish?

96capricemgr

iTrader: (1)

Well then it isn't a GM Hotcam is it?


WTF is "30 over" when discussing heads?


Hard to help people when the OP and half the respondents are clueless.

Mike_hawk

I have an lq4 with a tsp 224 cam, I had my 317's milled .040" and used a stock gasket. The compression calculator I used put this combo at 10.2 to 1.