LT1 performance numbers

[wako29]

so I have a few performance questions concerning my '93 LT1. What were the hp and torgue numbers for the stock setup?


I am planning to put in a nice intake, pretty good headers with full exhuast, LT4 Hot Cam, a chip, and am going to rebuild the motor (probably only like 355ci), as well as a few odd-and-ends like pulleys, good oil, spark plugs and wires, etc. What do you thing would be the numbers then? I am just curious, because I would like to start planning for my chasis a little bit for the hot rod I am building and am putting the LT1 in.

Thanks in advance, guys

[Craig 94 TA GT]

Stock is: 275 hp @ 5000, 325 tq @ 2400.

I would guess after everything, 340-360 hp? I really don't see much in the intake without any head work IMHO.

Good luck...

[wako29]

well, does anybody know of some places that do some decent head work? I just want something that is cleaned up and all.

I know that Edelbrock has some Performer heads for ~$1k, are these worth it? They don't look all that special, especially since for twice as much I can get the LT4 kit for not much more.

[fastTa]

Combination Motorsports are well known for their head work. They did my LT4 heads. The numbers were incredible.

Combination Motorsports

[KnightFire]

If tuned well, I would say around 350RWHP...easiest way to gauge is to get Dyno 2000 software and put in all your specs, I've personally found it to be quite accurate +/- 10RWHP. The more accurate your input numbers are the more accurate the HP tables are.



KnightFire

[wako29]

Originally posted by fastTA
Combination Motorsports are well known for their head work. They did my LT4 heads. The numbers were incredible.

Combination Motorsports

I called them up earlier today, and they want like $1200 to do the stage one thing for my heads. That is just as much money as if I bought the LT4 heads. By saying that, I am assuming that: I can get the kit for, lets say, $2100. at least $200 of that is for a cam that I will be getting. Plus, I would say that my LT1 heads are for a good $400-500. That leaves me to about $1400-1500 for the LT4 heads. Then the kit includes all the gaskets, the nice red intake (which is $230).


so, I dunno.
Thanks for all the advice though, guys

[Michigan Skip]

I agree with Timelord about using Desktop Dyno. You would be surprised at the numbers you'd see with stock heads! Other than that I have heard good reports from Lloyd Elliot out of Red Oak TX. Around 800 for a decent port/polish with bigger valves.
His e-mail: nighttrain@msn.com

OR... find a set of LT1 372 heads. They flow really well out of the box.

[fastTa]

Here is a package deal with a price I think you will really like, and it will make much more power than the LT4 conversion kit.

Scroll down to the bottom of the page to "power pack II":

http://www.lt1f-body.racenet.net/valvetrain.php

[wako29]

Originally posted by fastTA
Here is a package deal with a price I think you will really like, and it will make much more power than the LT4 conversion kit.

Scroll down to the bottom of the page to "power pack II":

http://www.lt1f-body.racenet.net/valvetrain.php

damn are those nice

however, do you still think those heads will be streetable? I guess it would all depend on the cam though.......


remember, I am NOT looking for balls-out performance. I am puting this LT1 in a '36 Chevy Master, so I need it to be able to idle VERY well (I have the 4L60-aka TH-700, and it might just run in some parades or somethin-all at about an idle), and just be able to cruise while still getting decent mileage.


AHHHHH, SO MANY FRICKEN CHOICES
I was looking through my Summit and found a set of pretty nice Trick Flows. 195cc intake ports, 75cc exhaust ports, 64cc combustion chambers, stainless steel 2.02"intake/1.60"exhaust valves, valve springs, retainers, loncks, guideplates, and 3/8" studs. All for only $1300.

then I have all the cams to choose from. AH, who could think spending money would be such a BITCH

[fastTa]

Yes, you are right it would depend on the cam but it would absolutely be streetable. I had stage 3 LT4 heads, intake, and a Comp 233/239 cam on my stock bottom end and it was just a little rough on the bottom end (<2000rpm) but the top end more than made up for it . Idle was pretty radical but sounded righteous!!

[wako29]

Originally posted by fastTA
Yes, you are right it would depend on the cam but it would absolutely be streetable. I had stage 3 LT4 heads, intake, and a Comp 233/239 cam on my stock bottom end and it was just a little rough on the bottom end (<2000rpm) but the top end more than made up for it . Idle was pretty radical but sounded righteous!!

yea, but that is a 233/239 cam

hell, even the LT4 Hot Cam is only 218/228 (but a pretty high lift at .525/.525)

[fastTa]

Origianlly posted by wako29:
yea, but that is a 233/239 cam

hell, even the LT4 Hot Cam is only 218/228 (but a pretty high lift at .525/.525)

I guess I was just trying to show that even my more extreme setup was streetable. So in comparison a stage 2 setup would be even more mild. Didn't mean to be confusing.

[wako29]

Originally posted by fastTA
I guess I was just trying to show that even my more extreme setup was streetable. So in comparison a stage 2 setup would be even more mild. Didn't mean to be confusing.

nope, your not confusing

I was just stating that your cam is really wild, and that the "mildness" of an engine relies more over a cam than the heads. Really nice setup you have there BTW. I definetly have to give you props for that

[Jeff95TA]

I've been looking into this same thing. I'm leaning towards the Lloyd Elliot porting on my stock heads with an XE224/230 and ported intake.