88BlackZ-51

I am anxious to hear how you made out Wayne. Do let us know.

And yeah I wont be making anywhere close to 550 rwhp n/a.

USAsOnlyWay

Yes yes yes, I'm just joking with Rick.
P.S. Wait until they release the direct injection version of those heads...

I'm just joking with Rick because way back, he said he had a friend with a stock C6 Z06 and he wanted to run with him.

yedister

The Toy has a 650 RWHP, it came from a Gen1 with ALLPRO heads. If you want power then build it! There is nothing different that you need to do to a Gen1 engine than to a LS7 engine. You have to take into account that all of the advances in LS engines came from the Gen1. If the LS series came with a 23 degree from the GEN1 era, guess what the horsepower would be.

T. Wayne Nelson

406 ci - cam 238, 242, lsa 110 lift of 558 --afr heads, 195 l98s--acell ecm gen7, headers (1 5/8) miniram with a 58 throttle body 10 to 1 compression ratio. 700 r trans. 370 rwhp 370 torque. I ran with the converter locked and unlocked, no difference... Wanted 400, got 370..God I hate dynos.

USAsOnlyWay

Thats why you need to find a better dyno...

Seriously though, I bet you'd pick up some good power with some 1 3/4" headers or larger (as long as you don't have a tiny exhaust down stream). I made some nice gains on my 383 and that was with a SuperRam and LPE cam.

T. Wayne Nelson

My exhaust is too small, but I have exhausted all of my money. It will cost me a couple grand to go to larger headers and 2 3/4 inch pipes. I am running 2 1/4 inch pipes with a crossover and no cats, which was on the 350. When I made the move to the 400 I spent all of my money on other stuff. I often wonder how many more horses I would end up with.

88BlackZ-51

can you email me that dyno graph if you can? i will pm you my email...

88BlackZ-51

Yes that does seem small Wayner. I am thinking a gain of 20rwhp wouldnt be out of the question with 1 3/4, and 2 3/4 or 3 inch true duals. I am no exhaust expert, but 20 rwhp seems realistic and maybe more.

cv67

T.Wayne it will pick up quite a bit, those 400s can move some air.
Let that thing eat.

Same issue here, headers are right sized, exhaust is too small.

383vett

Another in agreement. On my 406 with essentially the same cam with more lift, I went from 1 3/4 Hookers to the ARH 1 3/4 stepped to 1 7/8 headers and picked up one and a half tenths. The car traps 127 which is more than my C6Z which was dynoed at 487 rwhp and traps 125.

USAsOnlyWay

Well, I think you did it the right way. Build a solid motor and if you can't afford to pick up the exhaust then, you can always go bigger later. At least this way you know you have more power in the "bank."

I think 20rwhp or more with a whole exhaust would be pretty easy actually. IIRC I picked up around 3/4 of that with a swap from 1 5/8" to 1 3/4" and 3" y-pipe over a 2.5" setup. This setup made nearly as much as open headers did!

383vett, I want those stepped ARHs bad. $$$ is going gears and race gear for now. Someday, I already have a 3" system waiting in the wings for them... (Shoot Wayne, we should talk, if I get ARHs I'll have spare 1 3/4" headers and my setup coming off... for a heck of a lot less than a couple grand too! )

383vett

Here's a crummy picture of the stepped headers. If you want them pretty, you need to coat them. These are after running with powder from gloves all over the place.

T. Wayne Nelson

Do not hesitate to contact me when your ready

5abivt

Congrats Rick ! Such a great feeling when you first hear it running. It sounds really good!!

88BlackZ-51

Sounds like you guys might be able to work out something that will benefit the both of you.......

88BlackZ-51

Thanks Mikey. I sent you an email.....

T. Wayne Nelson

Well I picked up a set of 1 3/4 headers yesterday, ceramic, cheaper set, but if it makes more HP then I will purchase a better set.

Went to RMR yesterday for T&T. This strip is at 4500 ft and driving here is like driving against a brick wall. On street tires I ran a 12.8, at 109 miles per hour, with a 60' time if 1.8. That would be an 11.8 at sea level. Car ran really good and once I get a set of MT dot's I should run 12.5 all day long. If you guys are right about the headers then possibly faster. Really happy with the car and the tune.

1989TransAm

"This strip is at 4500 ft and driving here is like driving against a brick wall"

Your right. That density altitude is a killer. I don't think enough people take that in consideration when comparing times and mph across the country.

tpi 421 vette

The 4500 ft Wayne was talking about is our actual altitude. The DA is usually 6000-9000 ft. Hey Wayne, did they have problems with water coming up thru the track like they usually do this time of year?

T. Wayne Nelson

Jim,

Not that I could tell.

By the way after all was said and done, smaller cam, etc. The 195 (l98) heads gave me 50 more horses than the edelbrocks, not talk, have dyno runs for both..