How much gain do S2 heads usually provide on a H/C car? It should be roughly the same for all types of heads, give or take 5-10hp, but generally speaking how much do heads help? The heads in question flow:

.400 245 194
.500 282 223
.550 292 233
.600 296 240

How much are these heads giving me, HP wise? 20, 25, 30, 35, 40?

 

I would guess 40-50 rwhp. I've seen some ported LS6 heads give about 60 rwhp on a cam-only car.

Tony

 

Heads only or Heads and cam???

If heads only, maybe 30-40 hp? Heads and cam 80-100?

 

heads should be 40hp, they used to be 30 but with time the good porters have got another 10 out of them.

Spankey I know we have gotten in it with your last post with your dyno numbers but why do you ask

 

Just trying to find the problem. If my heads are giving me 30 hp, that means a 2002 full bolt on (pulleys, headers, orp, lid, K+N, bellows, catback, LS6 intake, etc) M6 car with 230/224 cam is only producing 380 rwhp? That seems awfully low to me. I'm about ready to put the car back to stock, I'm frustrated and tired of fooling with it. We'll see. Point is, I know my heads are giving up 5-10hp versus the "big name" heads. Thats ok with me, considering I have ~$1000 to $1500 less than I would have in a set of GTPs, MTIs, AREs, or Carteks. I could sell the heads, cam, 12 bolt, have a 340-360RWHP car that drives and idles like stock.

I'm getting some more tuning, going to install some 26" radials this time, change plugs, and install a cutout before my next dyno, so we'll see if the numbers improve.

 

As for what are heads worth, really I think that's an area under the curve question, not just a peak number question.

To really attempt to answer is sort of voodoo.

~40rwhp peak with the best heads seems reasonable to me

~30rwhp with good stage two heads

Spanky, if you thinking about pulling the TEA heads, what about getting a set of Absolutes and slap them on the car, don't change anything else and redyno?

I'd start asking Brian at TEA questions if you've not already. Find out if they changed the way they do the valve job or something like that recently. Seems like to me your set up should make more than my set up for sure.

 

Post deleted by 99 Black Bird T/A

 

If I pull the heads, some stock (not $1700) heads will be re-installed, and a cam with specs remarkably similar to those that it came with.

 

SPANKY LS1 have you been to the track? I wouldn't worry so much about your dyno #'s there are so many factors and variables when it comes to those big dyno # cars... See what it runs at the track before you tearing it apart....

 

Post deleted by XFiveLiter

 

I didnt think about the absolutes, in your other thread I suggested you get gtp's, but the absolutes are making good power and are around the same price as the teas. just another thing to think about, or just put stock heads back on the car, sell your tea's to cut your losses, 02 cars with your set up and stock heads dyno well