MS4 with M6 3.42's
 

I want the biggest cam possible, I have a stock block with 22k miles. Im getting a set of Precison Race Components Stg 2.5 5.3L Heads & Cam package. I know 3.42's suck with any good sized cam, but most of my fun is from highway speeds. Nothing less than 45. Whats the biggest you think I could pull off? It seems like once your in the power-band, as long as you wind every gear out you would alway have plenty of power.

you might want to check to see if a ms4 will clear with those heads. i have ms4 with 3.42 but i have the auto so gearing is a bit diffrent. i dont feel like i have any dead spots on shifts. im pretty sure you will like the ms4 makes decent power n/a and nitrous also.

I've got the MS3/5.3 combo with stock 3.42s and it pulls like a mofo in any gear. Starting in second gear @ 50 mph is:eek2:

the ms4 wont clear with the stage 2.5 5.3liter heads, but it will clear with the stage 1

Why not change the gear? You're gonna waste a lot of the potential of the cam. Too much time spent climbing back into the peak.

I'm sure I'll be changing the gear in the next few months. Right now I just want to get it up and running. So I can't run the MS4 due to clearance on the 5.3 heads. But the ls6 heads will clear it. Is it worth getting the stage 1 ls6 head to run the ms4 or to run the stage2.5 5.3 heads with the ms3. Seems like the 5.3 heads would yield higher compression and high hp numbers right?

Is anyone running the ms4 with 3.42's?

to the top...

Clear what?
Piston to valve?

THATS WHAT I WANT TO KNOW?? WHEN ORDERING THE H/C PACKAGE THE MS4 IS NOT OFFERED WITH THESE HEADS. THERE MUST BE SOMETHING THAT KEEPS THAT FROM BEING OFFERED.

Obviously, you can drive the car without gears, but believe me... gears are going to make the car a lot more fun. Even if you have no aspirations of taking it to the track and don't race from a dig, it's just easier to start the car up from a stop casually with gears. The M6s should have come with 4.10s from the factory... period.

Probably PTV clearance. Just get what you want, and flycut to fit. Simple enough. Or get a different package. There's tons out there. It's not like you have to follow the latest fads on what to buy.

If PTV clearance is the reason that 2.5s & MS4 cams don't mix,it just means a little less lift is in order.No biggie.PTV is definitly not an issue for me.
4.10 gears are almost a requirement in order to make an MS4..or even a TRex work..At least with a 5.7.
If the combo is tuned properly.A six speed/MS4/4.10 will get 23 mpg highway.
I speak from expirence.

Lift has nothing to do with PtV clearance. 2.5 5.3's & MS4 = flycut 2cc(roughly .080) to be safe and order the heads with 60cc chambers with .040 cometics to bump up DCR( boost in low-end and midrange that suffers from large cams)

Just Call Texas-Speed and ask questions. They will be glad to answer your questions

I wouldn't say it's got NOTHING to do with Ptv clearance.
Its a factor..Not the only factor..A combination of ramp rate,total lift, duration,& maybe deck height..That's how I understand it.
BTW my 2.5's were 64.8 CC's as delivered.
When anyone places their order for these heads..The cc size needs to be specified...I also recommend getting flow sheets.You have to ask fo them & I think they charge $50 for the service...But it takes the guess work out.

i run 3.42's with a torquer 3 and dont have any problems.pulls real good.and tsp will be happy to answer any questions.

Hey Bye Rice, any clearance problems w/ your cam and heads? I'll be buying a set within the next month or 2. Did you have to cut valve reliefs?

Why do you want the biggest cam possible?

Just felt the need to throw this in here. Kind of tired of seeing all the MS4 threads all the time.
https://ls1tech.com/forums/generation-iii-internal-engine/683617-do-any-shops-market-small-cams-anymore-why-not.html

Glad someone else sees the light.

You could also read this thread. It's about designing cams a little differently than seeing what the biggest that'll fit is.
https://ls1tech.com/forums/generation-iii-internal-engine/652563-reverse-torquer-cam-other-side-coin.html

I don't have clearance problems..But I'm not a good source of information Because my aftermarket Manley pistons have valve reliefs(-3cc).I was told I wouldv'e been fine either way.
My new engine(stroker) has even more clearance(-7cc)...I could run a NASTY cam with that setup.