Results from Head/Cam install
Joined: Nov 2001
Posts: 3,043
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From: Texas and Qatar
Originally Posted by 01midnightss
Joseph, yea I definately would have went with the 5.3 heads if I planned on sticking with the 224, but I plan on going bigger once I can get a daily driver. Also do the YT's cause for you to put down less power?
Thread Starter
Staging Lane
Joined: Apr 2003
Posts: 51
Likes: 0
From: Ohio
Originally Posted by -Joseph-
Never had any good results with the YT rockers, one of our customers who installed them lost 15rwhp on a similiar setup to yours, but there are others who do not gain or loose power with them, although it does make for a quieter valvetrain when setup right. I'm kinda undecided on if they are better than stock rockers though.
On one of my older combo's, a TR220 and Stage II 5.3 heads. I picked up 16rwhp with the only changes being a ported tb and an ASP pulley. Those two mods should be on anyones car that is looking for good dyno numbers. Those cats aren't helping matters either. Good dyno numbers can be found by paying attention to the details, belive me.. 
Last edited by gomer; Mar 11, 2004 at 05:09 AM.
I have a similar set up with a 224/228 Comp cam, "cleaned up" TB, & pulley. The car made 408rwhp & 396rwtq with mild LS1 ported heads. I bolted on a pair of LS6 ported heads with 2.055/1.57 valves and it lost 5rwhp and 15rwtq on the same dyno and retuned. I think my set up would have benefited from a bigger cam and so would you with those heads...you'd "probably" see a big difference. The LS6 ported heads on a stock bottom end "seem" to respond to bigger cams IMO. I personally went the 383 route instead of another cam...probably dumb in retrospect but WTF.
im new to the whole motor build up thing,but one thing i have picked up on (thanks to this board! you guys rock!) is mods tend to get more expodential(spelling?) the more you do. removing the cats on my stock z might give me 7-10 hp but on your modded beast could be as high as 10-20. ive read alot of posts with slp headers that were changed out and on average gained @ another 10-15hp. dont get down on your setup by comparing them to others unless you have the EXACT same setup. apples to apples. i think your well beyond the 400 mark you just need some minor bolt ons, different headers, and some quick change off road pipes and you'l have a nice perma grin! at least till the mod bug bites ya again! good luck
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TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Before/after on the same dyno is the best comparision. If you gain 80-110RWHP (Depending on cam/head config) you are in the ballpark 
Nineball is right, although I gained 24RWHP with ORY over high flow 3 inch cats
Nineball is right, although I gained 24RWHP with ORY over high flow 3 inch cats
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
Originally Posted by Beast96Z
The number aren't low considering th emods left on the table. Don't forget about the SLP headers. There not good for the numbers either.
Yeah, those SLP's don't make power
.Cam only (stock heads) TSP 231/237 here, SLP LT's, and I'm at/around and perhaps even a little over 400rwhp now.
Yes, the 5.3's would have been better paired to the 224.
Did you make your purchase outright without asking for advice from the manuf/shop/tuner as to which head would pair up well to the 224? Inversely, did you ask which cam would pair up well with the PP ls6style heads?
I would be upset with not breaking 400 on a head/cam setup on an M6.
Basic Questions/Observations:
Is the cam in correctly? (is it off tooth?)
I see your exhaust is not restrictive.
High Flow cats shouldn't give up too much HP (15 at most, but you'll see 24 in the case mentioned above, so things vary)...
You have a good clutch.
Do all the remaining bolt ons, like a ported TB, UD pulley, slip on some off road Y-pipe inserts to dyno without cats. If, after doing all these things, you're still not satisfied with the results, I would pull those heads and have them Flow Benched by an independent shop. What CC chamber are they?
TECH Fanatic
Joined: Feb 2002
Posts: 1,329
Likes: 0
From: Middleburg, FL
forget those number's look at the numbers on your timeslip. It does seem a bit low, but the timeslip is what matters, unless you didn't do the mods to make it faster, butyou did it for internet #s? Seriously, I could care less if my car only made 350, as long is it hit the numebr at the track!
FWIW, I tend to agree with everyone else though, for a opened up heads, that a small cam, DD or not.
FWIW, I tend to agree with everyone else though, for a opened up heads, that a small cam, DD or not.
Thread Starter
Staging Lane
Joined: Apr 2003
Posts: 51
Likes: 0
From: Ohio
Originally Posted by 30th TA 0219
forget those number's look at the numbers on your timeslip. It does seem a bit low, but the timeslip is what matters, unless you didn't do the mods to make it faster, butyou did it for internet #s? Seriously, I could care less if my car only made 350, as long is it hit the numebr at the track!
FWIW, I tend to agree with everyone else though, for a opened up heads, that a small cam, DD or not.
FWIW, I tend to agree with everyone else though, for a opened up heads, that a small cam, DD or not.
Nine Ball nailed it earlier...
1. !Cats = 7-8 rwhp
2. Crank pulley = 8-10 rwhp
3. Ported Throttle body = 6-8 rwhp
I would do #2 and #3 for sure.
Keep the Y/T rockers I challenge anyone who says to remove them to be show results. They are high quality but non-adjustable rocker arms. The rule of thumb to buildin a combo is do all of the boltons before you start to CHANGE the combo.
1. !Cats = 7-8 rwhp
2. Crank pulley = 8-10 rwhp
3. Ported Throttle body = 6-8 rwhp
I would do #2 and #3 for sure.
Keep the Y/T rockers I challenge anyone who says to remove them to be show results. They are high quality but non-adjustable rocker arms. The rule of thumb to buildin a combo is do all of the boltons before you start to CHANGE the combo.
TECH Junkie
Joined: Jan 2002
Posts: 3,015
Likes: 0
From: At the office
Originally Posted by HeritageLS1
Don't feel bad, I only did 394/372 with a 228R and PP S2 5.3 heads. Thats with a pulley, TB and every other bolt on...FWIW, I got my heads at the end of July/beginning of August of 2003. I am doing alot of research on my next combo I will be doing later this year.
Originally Posted by Slowhawk
Try not to chase dyno #'s,you'll stay more sane that way..If you want to just remove the Cats,port the TB,install a pulley,ect,ect..I ussually see 365-375 rwhp with a TR224 and bolt-ons(no head work)
