Head and Cam numbers????
Thread Starter
Burning Brakes
Joined: Feb 2003
Posts: 1,024
Likes: 3
From: Warrenton VA
Head and Cam numbers????
Ok I just picked up a corvette from a forum member I like the car and everything. It has having so crazy valve noise but I am getting that checked out next weekend. The reason I post is because I am bothered by the dyno sheet I have. It only shows 388 to the ground. Now I know that the gears drop it a little but come on now... Is it just me or does this sound really low to anyone else.
AFR 205 Heads
224-228 with 581 lift and 112 LSA
80MM BBK TB
LS6 Intake mani
Dynamax headers w/ high flow cats
B&B RT 66 exhaust
3.90 gears
Blackwing intake
smooth couper and Z06 air bridge
AFR 205 Heads
224-228 with 581 lift and 112 LSA
80MM BBK TB
LS6 Intake mani
Dynamax headers w/ high flow cats
B&B RT 66 exhaust
3.90 gears
Blackwing intake
smooth couper and Z06 air bridge
Advanced
Joined: Apr 2005
Posts: 65
Likes: 0
It wasn't a zo6 so the factory stock ponies would be around 340 hp (guessing) as the 01 zo6 was around 340 and the 02 and later was 360-365. So with those mods you should around 400 rwhp if it wasn't a zo6 to start with. The C/R was lower on the non zo6 so maybe you are losing around 15 there. Also has it been tuned correctly as they could have done the mods but not tuned and that could be aniother 20.
Don't flame me but that cam is close to a stock zo6 spec isn't it?
I think your close to expected maybe a little more left
Don't flame me but that cam is close to a stock zo6 spec isn't it?
I think your close to expected maybe a little more left
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Mar 2006
Posts: 1,195
Likes: 25
From: Tacoma WA
Originally Posted by 22655td
Don't flame me but that cam is close to a stock zo6 spec isn't it?
2002+ LS6 cam
204/218 int/exh @ 0.05" duration
0.551" / 0.547" int/exh lift
117 LSA
From everything i've read and the mods i'm about to do to my car
---
P&P LS6 Heads
LS6 Intake
Dynatech LT & B&B Bullets
Cam 224/224 .581/.581 112lsa
valve springs/rods/lifters/oil pump/ ls2 chain
+ A good dyno tune
---
should be at or above 400rwhp on a MN6.
I don't know how the AFR 205 heads compare to Ported and Polished LS6 heads, but to me, with a good tune, you should be closer to 400 than that, if not above it...
Of course, every LS1 is different...
GL
Dan
Oh Yeah - and i forgot; some things that could easily effect 20+ whp: Mustang vs. DynoJet, Temp, Humidity
Last edited by LF97C5Vette; Sep 22, 2006 at 09:22 PM.
Burning Brakes
Joined: Aug 2006
Posts: 789
Likes: 38
From: Shreveport LA
It should be alot higher, I have a buddy that has that cam and tsp cheap headers and put down 408rwhp. It might be in the tuneing. Then again that crazy valve noise might have something to do with it. If it is seeing knock it could reduce the timing a lot. You could have a bent pushrod or valve even, there could be a lot of stuff you need to check, but to answer your question that is too low for those mods.
Pro
Joined: Dec 2004
Posts: 563
Likes: 1
From: Mission Viejo CA
I wouldn't loose to much sleep on the dyno numbers. The HP your missing could be in the tune. I would bet that your AF is really fat and with a little work on the PE table you will find the missing HP. Valve noise is also normal for your mods. I have tuned a lot of setups similar to yours and I would expect about 405 to 420 out of the mods you listed. Get the car on the dyno and look to see if the AF is set really fat.
Thread Starter
Burning Brakes
Joined: Feb 2003
Posts: 1,024
Likes: 3
From: Warrenton VA
I think it was a dynojet dyno run... It's an M6 so it should be a lot higher I think. They are definately AFR heads I can see the logo right on the front. I will be getting it tuned next week.
Safety Car
Joined: May 2000
Posts: 4,827
Likes: 351
From: Albuquerque NM
Yes, it should be higher. I'm running arguably poorer flowing heads (P & P 5.3 L) , a much smaller cam (218/.561"/114), simular gearing and heavy aftermarket wheels and made 422/398 sae on a dynojet.
Get a tune, it'll pick up.
Get a tune, it'll pick up.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Valve train noise is not normal with a cam, it is a sign the pushrods have not developed the correct lifter preload. I would start there. I would also contact Tony Mamo at AFR, since that cam looks like his grind. He may also be able to point you in the right direction.
Drifting
Joined: Jul 2002
Posts: 1,396
Likes: 0
From: new york
Originally Posted by vettenuts
Valve train noise is not normal with a cam, it is a sign the pushrods have not developed the correct lifter preload. I would start there. I would also contact Tony Mamo at AFR, since that cam looks like his grind. He may also be able to point you in the right direction.
Valve train noise is normal with heads and cam change do some searches you will find that that it is normal with heads and cam change!!!!!!!!!!!!!!http://forums.corvetteforum.com/show...ve+train+noise
http://forums.corvetteforum.com/show...+machine+noise
http://forums.corvetteforum.com/show...+machine+noise
http://forums.corvetteforum.com/show...+machine+noise
QUIMBO
SEEYAAAH
Last edited by quimbo; Sep 23, 2006 at 09:32 AM.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by quimbo
Valve train noise is normal with heads and cam change do some searches you will find that that it is normal with heads and cam change!!!!!!!!!!!!!!http://forums.corvetteforum.com/show...ve+train+noise
http://forums.corvetteforum.com/show...+machine+noise
http://forums.corvetteforum.com/show...+machine+noise
http://forums.corvetteforum.com/show...+machine+noise
QUIMBO
SEEYAAAH
Drifting
Joined: Jul 2002
Posts: 1,396
Likes: 0
From: new york
Originally Posted by tjwong
It isn't always normal. I did a head swap on a customers car which had MTI ported heads. He said it was always a bit noisey since it was done. When I disassembled the heads, I found shims under the rocker plates, and found that there wasn't adequate preload on the lifters due to the shims. The tops of 90% of his valves were all chewed up as well as the rocker arm tips. So just because someone says its normal, one had better check to make sure that there is proper valve geometry and lifter preload. This guy was going to sell the heads for around $1000, and he would have got that but to repair the heads would have cost $500+ so all he got was $600 for them
Listen im not trying to start any Sheot here but if my tuner says its normal and other forum vendor tuners say its normal i would have to go what is told to me unless its proven different to me!!!!!!!!! I have seen and heard many heads and cam cars done by various tuners not only corvettes and have heard some valve train noise in all those cars. Aslo i have also heard that Headers will also contribute to more valve train noise
QUIMBO
SEEYAAAH
Last edited by quimbo; Sep 23, 2006 at 11:02 AM.
Melting Slicks
Joined: Dec 2002
Posts: 3,296
Likes: 30
From: Friendswood, Tx
Valve train noise on a H/C car is normal, period. That's like owning a blower car and telling me that the whistle of the blower isn't normal. I've seen over a dozen H/C cars dynoed and have known several people who have a H/C car......depending on the combo you go with you should be between 410-440rwhp. Sure, every car, every dyno, every package etc. is different- but from what I've seen on a DynoJet, that's accurate assumption. It's all in the tune.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
It is not normal, what is your lifter preload? Stock lifters will quiet right down with 0.100" of preload. There are a ton of cars out there running cams that sound stock for load. Mine sounds stock, and my preload was set with a dial indicator to the lifter specifications. If you are running stock pushrod length on an aftermarket cam, you preload is probably too low.