SStressin

iTrader: (5)

So i have cnc trickflow 225 on my 383. Right now its at 11.6 to 1 with 62cc. Would it be worth it to mill them down to 59cc? My engines already apart and out on a refresh build. Has a big eps cam so that would deff benefit with the compression bump. How much could i go up to while still on 93?

LilJayV10

iTrader: (39)

What head gaskets are you using?

SStressin

iTrader: (5)

Cometic .040 3.910

dr_whigham

iTrader: (49)

Your head gasket scares me. Aren't those combustion chambers set up for a 4" bore? Shouldn't you be using a Cometic 4.005 or so?

SNLPerformance

iTrader: (15)

What are the specs on cam or have you already calculated DCR?

JakeFusion

iTrader: (7)

I would think you need a 4" bore gasket as well.

And what cam do you have now? If your DCR is already over 8.5:1, I wouldn't mess with it.

SStressin

iTrader: (5)

**** i didnt even realize that i needed to change my headgasket when i switched heads. Ran the 3.910 on it and they worked. Didnt even cross my mind till you guys said something. Guess i got lucky. Cam is 240-256 .647/.647 111lsA

JakeFusion

iTrader: (7)

And it's an EPS custom? I think those particular high-lift lobes are what 290 at .006" and 306? What's the ICL? 108?

I would run the 4.005" at a minimum. Measure the head and see. 4.030 or 4.060 might be warranted.

dr_whigham

iTrader: (49)

Honestly, now that the head gaskets out of the way, you need to simply call Geoff and ask him. He spec'd the cam, and he knows TFS heads. He'll be able to tell you how much you can go safely

chevybayboy

iTrader: (6)

I'm 383 as well they told me I needed a 3.910 gasket as well