I've decided to go with having Elliott Portworks do my head porting and intake porting. Instead of the LT4's I've decided to just have a pair of LT1's ported along with a stock intake. I was told that the LT4 heads just have bigger valves and if I did have them ported that the valves would be way too big and I wouldn't see the gains I'd see if I just had my LT1 heads ported...so...

The LT1 ported heads will be running ~200cc at ~275/190 for $1,200. The LT1 intake will be ported to accept a 58mm TB for $100. Instead of going with the CC306 I was advised to go with the Xtreme 230/236 cam, which I was told is a much more 'streetable' cam. It powers from ~1500 all the way up to 6500 rpm's. About .112 lobe separation from .540 - .560. Comp Cam R Magnum 1.6 riller rockers will still be used and Lloyd, for $1200, will be adding everyhting else to the heads to make them a simple bolt-on after he's done.

Elliott also provides a bench test, one for the stock LT1 heads I'm sending and one for the ported LT1 heads when he's done. I'm supposed to find hp from 360-380rw after all is said and done.

Anyone like this set up?

 

Any second now, Ken will move this to LT1 Tech.

But yes, that is a good combo of top end parts you've got there. Quite a few M6 cars have made 380-400 rwhp with that cam.

 

I see how it is im the bad guy, Fred isnt


And FacelessZ here is my dyno chart with that xe cam and ported stock heads.

 

Nice Dyno! What other mods did you have with that?

I also have my heads ported, with headers but I was thinking of the less radical XE224/230 (Combination Motorsports 224XL) How much less HP would I be looking at?

Ben

 

Thanks for your info guys. Sorry for the inappropriate posting in tech...

Peace

 

Hmm let me see if i can remember as i havent had that setup for a while-

Things that would affect power were-
58mm TB
Hooker LTs
True 3" Duals w/ x-pipe

 

That graph looks great. Do you have LT's with that setup? and who did the tune?

Jeff D.

 

How would a GMMG chambered exhaust work with such a set-up? Anyone have GMMG chambered?

 

Yep LTs.

Pcmforless did the initial tune, which actually was around the same HP/TRQ that i ended up with after a dyno tune by Mustgofaster.

 

That's going to make me change my cam. That's 30 or so hp more than I was expecting from the 224/230. HP peak is around 6200rpm too. I went smaller becaue I thought you had to rev that cam to 6800 or so to get it all out. Torque comes on at 3000rpm too. Awesome.
Are you an A4 guy? running stock convertor? how are the brakes?
Thanks for the reply

Jeff D.

 

i have 95z i will be rebuilding it 383 what is the best daily driver cam and that will work with stock fuel pump and inj. o the car is a A4 with 3.42gears

thanks steven

 

'Good' or 'bad' is relative. You're just getting predictable in your old age.