whitedakota

iTrader: (1)

ive searched and read a couple different threads and read that this combo is any where from 10.9:1 - 12.50:1. All the threads were a few years old. Any new info on this setup? Thanks also with a tsp 220 .581 112 camshaft.

(found another set of tsp heads cheap!)

1994Vmax

iTrader: (4)

10.9:1 is with a 64 CC head and the factory gasket.... as you have an iron LS2 at that point. 61 cc would make it around 11.4 or 11.5:1 based on the head gasket thickness.

whitedakota

iTrader: (1)

Is 11.5 give or take acceptable to be a daily driver in my truck in sig?

whitedakota

iTrader: (1)

Anybody? From what I've searched it should be ok.

Specs on everything. Lq9, (coated flat top pistons) tsp 2.5 862 5.3 heads 61.15cc, and the following mods in sig. Cam is a tsp 220 .581 112. Based on a .051 mls gasket. Should a .060 gasket be recommended? Along with pro comp head studs.

What would the dynamic compression be? Should be a torque monster correct and around 400whp from what I've gathered?

Thanks

low2001gmc

iTrader: (137)

ive never ran such compression ratio but if already installed, pump on some 93 octane, have it tuned and tuner should be able to tell you if any detonation. i run 11:1 on 93 with no detonation but i also run some cometic head gaskets which are supposed to help prevent it so unsure bout your combo. good luck with your 400rwhp project

whitedakota

iTrader: (1)

It's not installed. A buddy offered me the fresh lq9 short block and another buddy has a set of tsp heads. (I just bought a set a few months ago) and the current cam is in my truck. The 5.3 runs decent now, but I know more is better cubic inch wise. Im just trying to figure out headgasket thickness to make this build even work. I have my 156k long block sold to a buddy if I decide to buy this lq9.

Gadgetized

iTrader: (9)

I put those heads on my 370. I was very surprised at how much the combustion chamber could be opened due to the larger bore. I am not sure if you feel confident doing this type of work yourself, but it is pretty easy. It would lower your compression slightly, and I would assume it would increase the flow. I did not test this on a flow bench, but I feel much better about opening them up. Let me see if I can find the thread I started.

I got looking through pics, and never took any after I finished cleaning up the chambers. Ha ha. You can see what the difference would be by the first pic though.

https://www.performancetrucks.net/fo...valves-505199/

whitedakota

iTrader: (1)

Yeah I did see that awhile back! I'm still up in the air on my math and compression and static #'s. Ive been reading and trying to learn a little more.

whitedakota

iTrader: (1)

Can somebody figure up the static and dynamic numbers on the combo mentioned above? Thanks.

ltr450ryder

iTrader: (13)

should be right around 11.25 with the .060 gaskets i ran 11.3 in my 408 on 93 with no problems