4Birdman

iTrader: (13)

A friend of mine runs a machine shop and he's going to redo my heads. I have some 5.3L heads, we are going to port them, size them for bigger valves, 3-angle them, and mill them down.

This car isn't a daily driver, I maybe drive it once or twice a week if the weather is nice. I'd like to run pump gas, so I want to be able to run 93 octane with no problems.

What would you guys suggest? I have a Futral F5 cam waiting to go in it as well.

4Birdman

iTrader: (13)

Guess it would help if I put what valves/cam I have.

2.00/1.55 valves are going in the heads.

Cam is a Futral F5 cam - 224/228 588/576 114cl

I'm looking for a good compression boost, around 10.5:1 hopefully.

Anyone have any good milling/head gasket thickness recommendations?

2000slpss

iTrader: (27)

i have the prc stage 2.5 5.3L heads and mine are milled .030. it has 2.04 and 1.6 valves i believe i run the ms3 cam. im at 11 to 1 compression but i have forged bottom end with mahle pistons with valve reliefs.

Phil'sC5vette

iTrader: (4)

I would think with .030 off, you'd be much higher that 11:1. I thought 5.3 were close to 10.8:1 stock

Randy WS6

iTrader: (69)

I have a set of 5.3 saved 0.30" and i had Farea 2.02" & 1.575" valves in the stock seats with a 5 angle valve job and custom port & polish job.

2000slpss

iTrader: (27)

my motor was built by texas-speed. and i think the reason it still sits at 11 to 1 instead of being higher is because my pistons have 4cc valve reliefs in them

4Birdman

iTrader: (13)

So you guys think going .030 on them and using the stock head gasket thickness, I'd be ok with the p/v clearance? Or will this be pushing the limits of that and pump gas?