v10viper04

I am swapping an LT1 into my C4 corvette( i know its not an F-body, but i am not getting help anywhere else) I cannot afford AFR heads... Mildly ported LT1 intake/stock iron castings/cc503 cam and matching valvetrain/1.6rr's/gasket match porting/longtube headers and 3" exhaust/52mm throttle body, and a custom tune probably from PCMforless. What kind of numbers would i be looking at? How much hp can i make with this setup with stock heads? Are LT4 heads more worthwhile? I need a cheap alterative to the AFR heads that will perform... I would like to make around the 450 flywheel hp. Any hep would be appreciated! Thanks!

v10viper04

Is there any glass ceiling for the LT1 heads? How much hp can they support? I would try to do some porting myself but i don't want to make them worse.....

chevyowner02

iTrader: (3)

Most HP numbers with that cam and supporting mods have been around 330rwhp.Also don't bother with the LT4 heads nothing special about them.If you want to make 450hp you will need a diffirent cam or a power adder.
http://www.elliottsportworks.com/lt1.html

v10viper04

Like the cc306? I hear its not too good with stock heads though...

chevyowner02

iTrader: (3)

To get the 450 you want you are not going to be having stock heads.
Mabey stock ported the LE1 kit will get you 400hp+ I would not use the cc306 on stock heads here is another place good with heads http://www.advancedinduction.com/AiProductsLT1.html

84redta

iTrader: (34)

Search ls1lt1.com, a lot of good research on there, and there was talk of fully P&P Lt1 heads being really good for performance. Nothing will replace money when it comes to horsepower, but the factory heads were pretty stout from my readings. Can't speak on cams, but upgraded valvetrain to LT4 specs were the positive concensus on one of the threads i read.

The same thread also said that unless your P&P LT4 heads, going aftermarket was worth it because of the significant cost of getting the heads put together, and spending a rediculous amount of money on the intake for that little bit extra material around the head area.

v10viper04

A guy i know that i have gotten both my T-56's from said he can do porting fr me for about $700-900. he says he has dyno proven his port jobs. (he really has been building LT1's for over 10 years) Not a big LS1 guy, likes his LT's. But as far as i see it i might as well wait a little longer and go with some AFR heads..... Am i right?

chevyowner02

iTrader: (3)

You don't have to have aftermarket heads,the stock head responds well to porting. All I am saying if you want 400+hp you are going to have 2 choices port your heads are buy them.IMOP the stock ported is a better than a set of aftermarket.

Firebat

iTrader: (7)

You are not going to see much of a difference of aftermarket heads out-of-the-box versus stock ported heads. I wouldn't even consider aftermarket heads on a LT1 unless its a 383 stroker. I believe ported stock heads and a custom cam from either LE or AI is the best bang for the buck.

v10viper04

anybody here know how to port stock LT heads?

v10viper04

???????

chevyowner02

iTrader: (3)

It is best to leave it to the ones who know how. You can really screw them up if you dont know what you are doing.

1981LT1

iTrader: (1)

I'll give you a ballpark for the numbers you are looking for. I have a '95 LT1 in my '81 camaro with the following items:

6-speed, LT headers with 3" exhaust to the mufflers and 2.5 out, Lloyd Elliot Stage 2 heads and cam, computer tune, 36lb injectors, 58mm TB, slightly ported intake, and a completely stock bottom end. This has given me a dyno of 362hp/365tq at the wheels.

My '86 also has a '95 LT1 with a CC305 cam, crappy flowtech headers into a flowmaster cat-back, 6-speed, stock heads, stock intake, stock TB, and a completely stock motor. This dynoed at 280hp at the wheels with a 700R4 trans. I haven't gotten it retuned for the 6-speed.

Hopefully this will give you a decent ballpark. If you want some decent HP you will have to work on the heads. Stock LT1 heads can be worked to flow very well by somebody who knows what they are doing. I would highly recommend Lloyd Elliot. Is it priced pretty good and he will talk to you about exactly what you want the motor to do and work the package accordingly.

1981LT1

iTrader: (1)

I ran the CC306 for years in my '81 camaro. You cannot use this cam with stock heads since it requires stiffer springs and a machine shop will have to cut the spring seats bigger. That cam is awesome for a 6-speed but was an absolute dog under 3K rpm's. Don't just get it becuase people say it is great for HP. You need to match everything and you will be much happier.

v10viper04

Well i would be changing the valvetrain anyways. I'll get a hold of elliot. Thanks for the numbers you posted.