nytoy

iTrader: (3)

I have the engine out and tried using the scr/dsr calc's but I dont know enough of the details.

Can someone help me calculate what head gasket to use or how much to have the stock 241 heads milled for max scr/dsr? Want to run on pump gas and I'm using the mahle -4 cc valve relief forged pistons. I've already called TSP. I have no money left for LS6 heads.

slow trap

iTrader: (22)

acording to my "rough" calculations, if you use a .040 cometic,shave your heads .030 or whatever it takes to get your heads down to 61 cc,cr will be around 10:9,i think.with the torquer on a 112 dcr will be alittle over 8.1,if you get it 112 +2 it will be right at 8.3 if my calcs are correct anyway.

nytoy

iTrader: (3)

ahh yes I forget to add that it was the 112 + 2

nytoy

iTrader: (3)

anyone else?

PREDATOR-Z

You are pissing in the wind on 241 heads.
Get a set of stock LS2 castings if you want the cheapest route. Those are ~ 62 cc
and mill .018 with .040 Cometic
You'll get ~11.2:1 and ~8.5 DCR

nytoy

iTrader: (3)

Just the man I was looking for to respond. I'm trying to put this motor together tonight, So it wouldnt be worth it to mill the stock ls1 heads and use an gm mls gasket then? I just figure since I have them off the car now anyways. The stock ls1 heads are 66.7 cc, with a stock .053 gm mls head gasket would it be worth it just to mill the heads for any increase just for the time being?

I was reading that every .006 off the head is -1cc correct?

seth webster

iTrader: (7)

BUMP
Im about to have the exact same setup on my car with the same pistons and cam the only difference is that I will be running TSP's Stage 1 LS6 heads

PREDATOR-Z

.005>.006 for every cc.
Problem is the 241 will require a significant amount of mill. to make desired impact.
You'll require 57 cc at least to make close to 11.0:1 SCR and 8.35 DCR

Doing that would kill your flow on stock heads.
Cost:241
Mill: ~$100
push rods (shorter) ~$125
Cometics ~$175
That is to get close to 11.0:1 with 59.5 cc/.040 with reduced flow.

That is why $450 for LS2 stock castings is a better choice if you are on tight budget.

nytoy

iTrader: (3)

Gotcha, that makes sense. I'll get the ls2's then and follow your advise above. I take it the cometics are the way to go virsus milling more from the head to keep the quench tight?

And how much shorter to I have to get the pushrods? I think I calc'd the T2 cam needing 7.425 with stock rockers before.

slow trap

iTrader: (22)

with milled heads the 7.425s might be alittle long. you will need 61 cc or less chambers with a thin cometic to get good dcr as predator has allready stated.

PREDATOR-Z

Use 7.40 p-rods
Because you shorten distance by .015 on heads and .014 on gasket
.015+.014= ~.029

Tv2 base circle is .09x smaller, take 1/2 of that is .045 effective radius
.045-.029= .016

7.40's will be perfect.

GuitsBoy

iTrader: (4)

I have the 112 +2 and milled my 241# heads .040. Im still using a 7.400 pushrod. My SCR is 10.9 and my DCR is about 8.2 with very small flycuts.

Mill as much as your comfortable doing and use a smaller gasket for a tighter quench. Id love a touch more compression myself.

nytoy

iTrader: (3)

I wonder what the difference in HP would be, between the stock ls2 243 head milled and a TSP stage one budget ported LS6 head milled with the same compression and dcr

PREDATOR-Z

should be 25>35 rwhp