C5_Mike

I have the TSP 233/239 112 LSA cam. I also want to keep my Hardened TSP 7.400 push rods. I just want to know what I can mill these to safely without worrying about clearance issues. What head gasket should I order? Currently have the crappy 853's on the car.



Also, can I keep my stock Rockers as long as I do the Trunion upgrade?

redtan

iTrader: (5)

If you want to keep your 7.400 pushrods then nothing. If you start milling your heads, you're going to need shorter pushrods to keep the same valvetrain geometry and lifter preload.

C5_Mike

So what mill/pushrods combo would you suggest then? I don't want to mill them very much.

427zm

iTrader: (9)

You really can't do it that way. You have to measure once milled. There's no guarntee the milling will directly relate to pushrod length.

C5_Mike

So it's a wait and see type thing?

So if I don't want to go to wild, what should I mill them to? I want to keep it running on pump gas.

Kbodls1

FWIW im putting a build to together using a cam very very close to yours but ive got 241's. The guy who speced my cam said I can't mill my heads any because of clearance issues. BUT he also said 243 have a tid bit better ptv clearence. im sure im wrong but you want around .100 intake and .90 exhaust to be safe But you can run pump gas all the way to 11.5:1

C5_Mike

Good info.


I just got off the phone with Texas Speed and they said nothing more than 7 thousandths. Does this sound right?

C5_Mike

And in another thread TSP said this.

redbird555

iTrader: (14)

Honestly if the cam is that close I would just not mill the heads. .010 will get you MAYBE .15-.2 higher compression which isnt worth it in my book. I'd just do a cleanup pass on them to make sure theyre traight and install them as that.

In short there's no good way to tell how much you can take off, every setup will vary. You may have ptv issues at .010 and other guy running the same setup may not have it until .015. Since you arent going to measure I would just let it alone, better safe than sorry

thunderstruck507

iTrader: (18)

my 799s had .010" off for cleanup (but I do not know if they have been milled or cleaned up before)

my cam is a 230/238 113+2

I did not measure PTV, my same 7.4" pushrods worked as stock heads and a 230/224 cam but I also went from GM Performance lifters from several years ago to some lifters from a Vortec 350 because they are what I had. The Vortec lifters require higher preload than say LS7 lifters or later years stock LS1 lifters. I tried running shorter pushrods and the car got bad bad noisy.

IIRC the lifters I am using require a .125" preload versus the .040-.080" of newer style lifters.

C5_Mike

I will just follow the advice given and just have them cleaned up. What gasket kit should I buy?

TXZ28LS1

iTrader: (5)

I wanna step up to the 233/239 cam as well with TEA LS6 heads. Im not sure if that cam will fit.

JakeFusion

iTrader: (7)

It'd be close. Just flycut and mill and buy whatever camshaft you want. It's not hard.

97camaro383

iTrader: (31)

Solid advice!!!