Maybe I missed it but do you have stock lifters or
Comp Rs? According to Comp, the lash adjustment
for the Rs is really small, like 1/16 of a turn past zero.

If you have stock lifters, anything between 1/4 turn
and 1.5 turns should work. I have been running some
serious lash based on some TPIS work that was done
(from their "Insider Hints" book), and the car runs great.

 

Is it ODB1 that has problems with the higher stalls not allowing the tranny to shift?

Those numbers are quite low for a cammed LT1, I'd be a little upset.
These are the numbers from my brothers car as well as 2 friends.
96LT1 Auto with stall and bolt ons-285rwhp
96LT1 T56 Bolt ons- 280rwhp : with slightly ported heads & XE 224/230 cam, 320rwhp running rich.
96LT1 T56 converted to ODB1 with bolt ons- 288rwhp

 

yea i think i am going to reajust the rockers and im running stock lifters. We went a total of 1/2 turn past 0 lash. I am kinda up set but the thing about it is the car should have put down alot more before the cam. It only did 254 with headers, catback,CAI,Underdrive pullys,ported MAF,stall,lt4 KM, So the cam gave me a good 30 rwhp peak and at some places in the rpm the car made almost 50rwhp more so i dont realy think it has to do with the cam install. But im going to do the rockers anyway.

Thanks
cal

 

Your car is an auto with a stall, that should tell you something about low dyno numbers...

You are going always have crappy dyno numbers comparewd to the m6 guys. The true test is at the track. See how it runs and calculate the hp.

 

If I were you I would either go to the strip, or find another place to dyno. Their dyno might just be way off.

 

I know I always jump to this, but did you degree the cam? Are you using a new timing chain/set? I missed it in your post if you are. If not, that might explain why your car only made 254 with headers. I would expect no less than 265 and that would be LOW, even with an auto. Your heads COULD just be a real shoddy set from the factory, but I would look elsewhere first. My gut instinct is that the LT1 had more than a few cars with crappy made timing sets, and people are running around with retarded cams. Heck, there have been people on this board that have had aftermarket stuff that has been retarded when installed straight up. ALWAYS degree a cam.

 

Ummm... From what I've read and been told cam's for these motors are designed to be installed straight up. My hotcam was installed straight up and no problems. Sounds like old school talk that doesn't apply to LT1's to me....

 

Do you have Bigger Wheels on? When I put on the Corvette 18" rims with 275/40/18 tires, the tranny didn't want to shift at WOT. I think it's because those wheels tricked the computer to believing I have lower gears..

Usually a slipping tranny is when the rpms go up but the speedo doesn't.

 

If you change the wheel/tire size the PCM will need to be reprogrammed to compensate for the increased/decreased wheel height, especially if its an auto.

-Tony

 

The stall might account for the shifting problems. But I thought 2800 stall was ok without having tranny shift problems. Anyhow, I'd get your tune straightened out and then try again.

What kind of Dyno was this on? Dynojet or Mustang? Also I'm not sure of the shop's reputation or experience, but make sure they know how to use that dynamometer 1:1 Ratio is 3rd gear on an Auto...

Mine put down 320rwHP/331rwTQ on a mustang dyno with the hotcam 218/228 w/ .525 lift(1.6), you should be close to that with the exception of my LTs.

Just some thoughts... Goodluck

 

Also, how many miles are on the stock Valve springs and lifters? They may be weakened since your last visit to the dyno...

Double check with Madwolf to see if you two are on the same page....

 

Ok ill try my best to answer all the great questions i have here.

The springs are brand new 612 from cmotorsports.com
lifters are factory with 118000 on the motor. I dynoed the first time the weekend before the cam install and a week after the install. 2 weeks between dynos.

Ion did change for my tire size, And the dyno shop is familiar with running these cars for he does all the clubs dyno days.

The car picked up good hp for the cam install and it runs real good. The #s are just low. If i can get it to change gears ill take it to the track and see what is up.
Im trying to figure out how to maybe scan it for knock retard and doing a leak down test?

Thanks cal