mattzoom

Can you run a MS4 cam on stock pistons and not have PTV issues? without having to flycut them?

Marc 85Z28

iTrader: (8)

If the heads and gaskets are stock yes. If you have thinner head gaskets, or larger valves, or milled heads, etc you will need to clearance the pistons.

MYSTIC-1SC

iTrader: (14)

Should clear no problem with stock cylinder heads and gaskets.

mattzoom

Going to be running these heads- http://www.texas-speed.com/p-1177-pr...ted-heads.aspx

mattzoom

I believe they are 64cc

Sales2@Texas-speed

iTrader: (5)

Stage 3 heads really aren't ideal for an LS1 short-block to start. The valves are too big and are shrouded on the relatively small bore.

The next issue, if you decided to run them shrouded like that, would piston to valve clearance. You will need to flycut the pistons FOR SURE with that camshaft and those heads!

mattzoom

Thanks thats what I thought, what about the ms3? still tossing around ideas on a cam, the car its going in is a 69 camaro track/street car, more track then street

4000 stall
vic jr intake
full bolt ons
th400
4.10 gears
small 100 shot
hopin for low 11s high 10s maybe
and im getting a good deal on those heads so I am going to see how it does.

Sales2@Texas-speed

iTrader: (5)

Still shrouding the valves....MS3 still needs flycut with them as well. Anything over about a 2.04" intake valves is too much for your LS1 bore.

mattzoom

well looks like Im going with the MS4 if I have to flycut them either way, thanks for the help Matt

Sales2@Texas-speed

iTrader: (5)

Not sure if I'm just not conveying this well enough or what, but those Stage 3 heads SHOULD NOT be used on a standard LS1 bore. The valves are shrouded (too close to sleeves) on the small bore.

mattzoom

I got it, what heads do you reccomend?

Sales2@Texas-speed

iTrader: (5)

For a real tight budget, stock LS6 heads would be a good upgrade over the LS1's you have. Or, for a little more money the Stage 2.5 5.3's and MS3 would be a blast and knock down some great ET's (of course with the proper bolt-ons and suspension upgrades!) For a wider budget, the aftermarket castings, be it PRC or TFS, would be the best performance!

mattzoom

Alright thanks

redracer1

iTrader: (2)

Matt, Datzneat has the MS3 stage 2.5 5.3's w/FAST on his build he put 470+ rwh. You add that 150 shot = money

And sometimes a good deal isn't a good deal

sabersaw30

iTrader: (10)

The prc 5.3 heads are tough to beat on the street.You can keep all the down low torque to kill them big headed cars.

PREDATOR-Z

That has been proven to be incorrect. The trick is not the size of the runner, but its ability to move air and maintain velocity.

mdeanlittle

iTrader: (2)

matt i have been calling texas speed all week trying to figure out will the stage 2.5 heads work with the ms3 or tsunami cam without cutting the pistons please let me know

mdeanlittle

iTrader: (2)

on a stock 346 ls1

sabersaw30

iTrader: (10)

Just my opinion.You are probably right but i like the small runners on a fast street car.I don't want to highjack the mans post.

mattzoom

bump for this guy



I am also lookin at these heads- http://s322636171.e-shop.info/shop/a...e.html?pse=apq