stk350

I need to know. I want to know if anyone has ever done it with there stock springs push rods lifters and rockers. I just wanna make sure nothing will bind. Thought I'd see if its ever been done. If I cant do it, than how? Can I use all stock LT1 parts? Or can I put some retainers on my stock springs? Motor is a 87 350 L98.

------------------
Mods to date. Edelbrock TES, hypertech stage 2 chip, T-5, !TB !CAT, Accel 8.5mm wires with NGK plugs, TPIS AFPR. Mods sitting on floor. Crane cam... and more to come.


Bring it on Capt. Curk.
"Supporter of the Anti-90 Second Rule"

RedIrocZ-28

Lots of people do it. The springs won't bind until about .490 lift. ( I found that out after pulling teeth on this board forever ) But I would really put in new springs. The old springs in your motor have probably lost a good portion of their tension. You'll be fine

Sam88Gta

I just registered on this board cause of this post.

About a year ago now I installed a Lt4 cam(not hot cam) in my 88 L98.At first I had a ZZ4 cam to be installed but after finding out I had to buy a expensive spring I changed my mind and bought the Lt4 cam insted.Btw i used a spring commonly called the "Z28" spring at machine shops.

I frequent the race track and have had at this time a consol full of time slips so I had a solid base line.8.90 at 80mph
After the install I immediately noticed a loss of lowend power and the car seemed to not start pulling till around 2200.Before it would pull off idle.I went back to the track only to find out I run the same time with the same mph as before.It was a waste of time and money to do the swap.Since then i have switched to 1.6 rockers on the dyno both intake and exhaust then intake and not exhaust and so on.The cam will not gain back the low end I once had.Also if you were wondering my car made 225hp and 296tq to the wheels with the following mods.

Cone K&n,airfoil,msd wires and coil,timing on 6 degrees(for the nitrous)no cat,Flowmaster cat back.It ran REAL rich(10.0a/f) and would have made more power but I was more concerned about the nitrous runs.

So in writing all this I would not suggest you doing the lt1 cam in your car.

But if you do I have one out of a 96 T/A for sale for $40.

stk350

Well I do have a few more mods that might make my motor breeth a little more easier. Headers and full exhaust. Also, what kind of rear do you have in your car Sam88. I'm going with a 3.42 with some drags. Also, did you just replace your stock springs with new stock springs?

[This message has been edited by stk350 (edited July 15, 2002).]

mrr23

i just did the lt1 cam swap in my car. i put the lt1 springs in because you need 85 lbs closed and 373 lbs open pressure. also will need to enlarge the spring pockets. 1.28 is the stock diameter. you will need atleast 1.32 diameter. mine was opened to 1.47. it was the next largest cut to make.

http://www.fl-thirdgen.org/mrr23-3.html

here is my web page showing what i did to the l98 heads.
will have dyno results soon. i also siamesed the entire intake base.


------------------
fl-thirdgen.org#0004
moderator @ www.fl-thirdgen.org '86 t/a, 3.27, auto, homemade CAI, hypertech AFPR, comp cams 1.52 roller tip rockers, holley prostrip annililator ignition system, shift kit,
OEM corvette 2100 rpm convertor, lakewood adjustable panhard rod and trailing arms, edelbrock 6872 headers, catco 6007 3" cat, flowmaster 17151 3" single outlet catback. 14.91 @ 90.57 177.7rwhp 356.4rwtq

Kevin91Z

Dont bother. The LT1 cam is almost identical to the cam you have now, just with a little more lift. You can accomplish the same thing with less hassle by putting 1.6 roller rockers on your car.

------------------
1991 Camaro Z28
350 L98 w/ T56 (originally 305 LB9 w/ T5)
318 RWHP, 419 RWTQ
12.803 @ 108.50 MPH (1.932 60')
Member: SoCal F-Bodies
ThirdGen 4-Life!

stk350

Well when I rebuilt my motor I converted it over to rollor. When I did this I only had a 305 rollor cam. I have a LT1 cam which is why I was wondering if it could be done.

super83Z

Kevin91Z is exactly right. If you are going to go through the hassle of changing the cam do it for something worthwhile.

------------------
I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28
Superramed roller 406 10.5 compression, AFR 195's and custom cam.

future mods:
N20 waiting to be installed

Wifes new car:

1995 Z28
AT, leather, T-tops bone stock for now. 250 RWHP 300 RWT 14.0 @ 99 MPH on a 2.2 60'

future mods:
header to tailpipe replacement and a cold air intake. Then I am just going to leave it alone (maybe)

mrr23

well compared to the 305 roller, it wll be a nice improvement

------------------
fl-thirdgen.org#0004
moderator @ www.fl-thirdgen.org '86 t/a, 3.27, auto, homemade CAI, hypertech AFPR, comp cams 1.52 roller tip rockers, holley prostrip annililator ignition system, shift kit,
OEM corvette 2100 rpm convertor, lakewood adjustable panhard rod and trailing arms, edelbrock 6872 headers, catco 6007 3" cat, flowmaster 17151 3" single outlet catback. 14.91 @ 90.57 177.7rwhp 356.4rwtq

Kevin91Z

It depends on what kind of 305 roller cam it is... If its the good 305 cam it's the exact same as the L98 cam. If its the bad 305 cam then its the "peanut" cam.

stk350

It's the bad 305 cam. It was just out 89 305 HO motor.

Sam88Gta

Sorry for the delay i was out of town.

I have a 3:42 rear and ride on nitto drags.
My base and runners are port matched.But its not near the improvement of what you have.

I say use the cam but if the motor is in the car would suggest doing a more radical one.Make it more worth your time.And it sounds badass.

------------------

Kevin91Z

Actually no, if it came out of an 89 305 "HO", (that would be a TPI with a stick shift and dual cats), then its the good 350 cam. If it came out of a TBI or TPI automatic car, then its the bad "peanut" cam.

gmackZ28

The LT1 cam is not a worth while swap? 1.6 rockers would yield the same performance? Somebody tell me something. I just got an LT1 cam and was going to put it in but rockers would be sooo much easier. What's the deal? There is no piston to valve problems with 1.6 rockers on an L03????

Kevin91Z

We're talking about a TPI car. On your TBI, yes the LT1 cam is a great mod, you will love it. The stock TBI cam is really tiny, its the "peanut" cam.