95GrapeApe

i have a 94 z 6 speed and it has a full exhaust with long tube hookers and slp lm 1 and a k&n CAI. i want to do a pulley kit, 58mm throttle body, and a nice tune. i was told that the previous owner had the motor rebulit and its a 355 with a small cam nothing crazy. is there anything else i should do or shouldn't do. ive heard alot of people doing the 1.6 roller rockers. any suggestions on that? i would really like to get 300 at the wheels or at least be able to beat an o6 mustang gt lol.

96lt1m6

iTrader: (31)

You should have no problem with 300 to the tire my bolt on car did 319/336 definitely do 1.6,7/16 roller rockers replace the the 3/8 studs with 7/16 studs,flat 5/16 guide plates with 7.200 chromoly pushrods. You wont regret it.... who did the tune?o

AdsoYo

iTrader: (1)

I would do the tune and hold off on the pulleys and throttle body.

Stock LT1's with CAI and full exhaust usually dyno in the 280's to the wheels so if you have a 355 with an aftermarket cam, you're probably close to 300 already. Getting the car on a dyno will not only give you more power than the throttle body and pulleys, it will show you where you are.

If you somehow are far off from 300 rwhp, the pulleys and throttle body won't help. They might get you 5-10 hp combined. A stock LT1 throttle body doesn't become a bottle neck until you're making substantially more than 300 hp.

95GrapeApe

I was going to have lt1 pcm do the tune for me via email i dont really have a dyno tuner around me. There is one but its like a 3 momth wait. I was going to data log the car for him so he could tune it as best as he could like on a dyno. He has good reviews so lets see what happens

nascarnate326

iTrader: (1)

So you have an aftermarket cam thats small (probably hotcam) but still have 1.5 rockers?

If so I would get some 1.6's in there.

95GrapeApe

Yeah im gunna do the roller rockets. also thinking about getting another set of heads and getting them done up a little. Anyone do their heads themselves if so how hard is it?

BSmiff

Welcome to LS1Tech. You have some reading to do boss. Since you already have mods I would start here https://ls1tech.com/forums/lt1-lt4-m...o-archive.html

pillarpod

no reason why you shouldn't have 300hp to the wheels now

96capricemgr

iTrader: (1)

A LOT of 355s are done really really badly, I wouldn't get his hopes up.

As said the pulleys and TB are poor ideas.
Pullies are better left for cars with belt driven waterpumps or road race cars that see LONG term high rpm use.
what gears are in it?

95GrapeApe

S&k speed shop aparently rebuilt the motor i just need to do a car fax to get the owners name and they can look it up. I have stock 3.42 gears. I was thinking of doing 3.73's but ive heard mixed reviews on it. i have 19" vette rims with a 285/40 tire and i feel like its going to affect the take-off with the stock gearing. I had a 95 with 3.73 with the ss rims and 275' on it but it was an auto but that sucker was fast only had it for 3 months but i had bought it like that. Never did gears myself

RamAir95TA

iTrader: (2)

The previous owner could care less. It's YOUR problem now...

ZzTeaRs

welcome to the site. listen to these guys and read a alot. they know how to do things right. this site has plenty of knowledgeable people take their advice

96capricemgr

iTrader: (1)

3.73s are good for an A4 car but just plain stupid for an M6. Basically nobody worth listening to will tell you they liked 3.73s better then 4.10s with an M6. You have a double overdrive. Without running the numbers I am pretty sure the M6 with 4.10s is still a lower cruise rpm than the A4 was with 3.73s.

tbag_skywalker

Just to put things in a different perspective, I almost wish I had 3.73's instead of 4.10's, even though my car is a 6 speed.

I cross the finish line turning 6100rpm's in 4th gear, which by coincidence is where my motor makes peak power according to my dyno sheet. Also, its not generally a good idea to take a stock bottom end LT1 much past that.

So if I decide to slap a set of 205cc heads on my car and get it retuned, there's a good chance I'll have to shift into 5th before the finish line... unless I add more tire or spin it faster, which I don't really wanna do. I'm running 295 35 18 C5Z's out back and they're already a bit taller than the stock setup.

So TS, my message to you is figure out what your ultimate goals are with your car, power and tire-wise, and then decide what gears you want. Gears are a kick *** upgrade. It was the very first mod I did, before I even bought my CAI. Went from consistent 14.0's to 13.7's.

95GrapeApe

My main goal with my car it to have a quick street car that i can cruise with and be able to keep up with everyone else and beat a few 4.6's that think they are fast lol

SS RRR

iTrader: (2)

That depends on usage, dear sir. Using a mild cam and heads can mean a world of difference between those two gears, at least at the track. With 4.10's I was in the 12.2 range in the low 114mph range, switched to 3.73's and dropped down to the 12.0 range at 115.5. Short times were close as well- 1.70 on the 4.10's and 1.75's on the 3.73's. Found out I was past my power peak while crossing the traps when running 4.10's.
For a stock power curve you're probably right, but M6 mild builds can benefit with a 3.73 gear.

bufmatmuslepants

iTrader: (3)

Are you beating 4.6s now? Full Bolton cars with a tune can beat a 4.6 pretty handily, if your losing ill bet you don't have a tune. Without cam or motor specs it'll be a crap shoot for a mail order. Did you buy it from a dealer that's why you don't know the previous owner?

Tom94TA

I think what he said is he needs the previous owners name so the speed shop that built the engine can find the build info in their files.

Those tall 19" rims are turning your 3.42s into like 3.08s. Get some 17s to better use the rear gears you have.

95GrapeApe

Exactly tom. I had bought the car from someone that only had it for a few months and sold it because they lost their job. The owner before him is the one who had the motor redone. I have not driven te car fully yet because it is not registered only around te block a few times i just want to make sure that i beat them. I know i want to do the 17's but i keep hearing crap that they look good on the car, especially from the girlfriend. Just want to find to ones i want. actually working on a trade right now.

tbag_skywalker

Well said, sir.

95GrapeApe - I'm thinking your best bet would be figure out what your current cam specs are, then buy a good set of heads that will work well with that cam and have it tuned. Then go from there. 3.42's are good gear already, but 3.73's would be even better. Don't forget to upgrade your throttle body, valve springs, and rocker arms.

Running low 12's at around 115 makes for a nice, fun street car.