T70

Hi Guys,

Can anyone tell me the max valve lift available in my LS1 before I have to machine the pistons.
I have some 1.8 ratio roller rockers which I want to use and I will get some decent springs.
But I'd like to get hold of the cam before I pull the engine to save time. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Advice and suggestions welcomed.

Tom.

bdawg/98mechamta#9

TTT , good question

T70

Can anyone help me in my quest? A simple answer will do.
And what does TTT mean?

Tom.

RTCamaroSS

Well im running an ASA hot cam, with 1.85 ratio rockers on an otherwise stock LS1. Cam specs are 226/236 .525/.525 110lsa, with the 1.85 rockers, the lift should be around .573 or so. I hope this helps.

Damian

iTrader: (89)

Tom, wether or not you're going to mill the heads will make a BIG difference on how much lift you can run.

If you're just planning on a cam slide, and leaving the heads in place then you have plenty of room. Anything .600 lift or below will clear fine with stock pistons and COMPLETELY stock heads. I've seen cars run well with lift #'s upwards of .580 and .045 off the heads, so you definately have plenty of room with stock unmilled heads. Good luck...

Josh

T70

Thankyou guys.
They're just the answers I was looking for. A cam slide is what I'm going for.
Cheers,
Tom.

Slowhawk

iTrader: (12)

Duration plays a big part on P/V clearence.I would say a Cam with .520 lift and under 232 duration will work with your setup without milling the Heads.

T70

Thanks again.

So are we saying that the 2002 (0.550) will work with the 1.8 rockers (0.582 total lift, 218 ex.) without the need for piston milling?

The duration will be unaffected, so in theory, as long as the lift will clear the pistons, and the springs are upto the job, there should be no problem, right??!!

I am not prepared to pull the engine apart so if anyone knows of a really nice cam, not too lumpy, which will work well with my 1.8 rockers, let me know.

Cheers,
Tom.

Dekmk21

I run a cam with intake at 219 dur at .050 and .607 lift and exhaust at 227 dur at .050 and .614 lift on 112 lsa with flat tops and 243 heads no milling and I have good room.

redtan

iTrader: (5)

Fantastic. I'm sure T70 has gotten his answer in the past 12 years since this thread was started.

KW Baraka

iTrader: (7)

I.....almost.....choked.....from.....laughing..... so.....hard!

Nothing says "not paying attention" like responding to a 12 1/2 year-old thread.

That's gotta be a record !

KW

Darth_V8r

iTrader: (4)

Nope in December, someone did a 14 year old thread. Two of them actually.

Gtopowerls1

Hey guys im trying to bring this back from the dead i have a 04 gto m6 and i have stock 241 heads and went and bought a 228r cam with .600 lift 112 lsa .660 valve springs 7.4 push rods and bought cosmetic .045 head gaskets . Anyone have a similar build or experience here should i have cleareance issues ?? I had someone put a link on how to measure for clearance but lost it.

SLP IROC-Z

iTrader: (14)

The 02 ls6 cam with 1.8 rockers will have plenty of ptv even with milled 243s. I ran that setup for years mine were milled .012 and had 62cc chambers. A bolton "ls6" setup is capable of over 400rwhp in a stick car. My 99 ls6 powered z28 with most bolt ons weighing 3370 went 10.84 @ 125 tuned for VP 110. Tell me thats not over 400 rwhp.

dreadpirateroberts

iTrader: (1)

There is the clay method as well as using a cam degree kit, which has checker springs you put in place of the valve springs as well as a dial indicator and mounting fixtures.

Assemble the valvetrain so the checker springs are in place, rocker arm and pushrod installed. turn the crank until it is around 5-15 degrees BTC or ATC, depending on which valve you are checking, and set up the dial indicator on top of the rocker tip, or retainer close to the stem, and set it to 0. Check the PTV clearance by pressing down on the valve until it meets the piston.

At least it's something like that. You will have to turn the crank slightly around that degree range and repeat the procedure untill you find the smallest measurement.

Then you need to flycut your pistons. There are also threads here that show how you can do this yourself.

98CayenneT/A

Measuring PtV
https://ls1tech.com/forums/generatio...ve-method.html

dreadpirateroberts

iTrader: (1)

That's new to me.

Although i would think using feeler guages would be more accurate. They make them as thick .050" maybe thicker...