1999 SS

iTrader: (3)

i dynoed 385rwhp with an f14, fast 90, nw90mm tb, QTP LT's, no cats, pulley, elec. water pump, fipk, *stock ported heads with bigger valves*, 12 bolt rear.
i know these #,s are real low but recently have been coming to the conclution that i probably got scammed on my heads . if that is the case how many hp could i be leaving on the table with stock heads and what would i be looking at gaining with a set of Dart heads.

Sigforty

Check out this post right here for some info how my car did with Dart heads. I also had bolt ons and the F14 cam.

https://ls1tech.com/forums/dynamometer-results-comparisons/480231-dart-205-dyno-numbers.html

1999 SS

iTrader: (3)

WOW could it be possible im leavin that much hp on the table with stock heads?

cash50

iTrader: (1)

even with stock heads, with like every bolt on except maybe a/c delete you should be making like 430 easy. maybe your injectors are maxed out??? or the tune is bad?? something seems funny about those #s

SideStep

430???

JakeFusion

iTrader: (7)

If the heads were ported improperly, I could see you losing 20rwhp from that. Try slapping some PRC LS6 heads on there and see what happens. Also, check to make sure your compression is good. Perhaps the port opened up the chambers quite a bit and you've lost some compression.

Otherwise, 385rwhp seems low for even an F14 with a ported LS6 intake and stock LS1 heads. That should be close to 405rwhp. Add in a FAST 90, mildly ported heads (should be at least as good as LS6 heads), EWP, and the F14, and I'd expect 430rwhp pretty easily. Just stock LS1 heads with the FAST 90 and F14 should be around 415rwhp.

slow trap

iTrader: (22)

i may have missed it but are you an a4 or m6 ?

1999 SS

iTrader: (3)

im m6 & also have 36lb injectors as well.

1999 SS

iTrader: (3)

if i were to get a set of Dart,s ( or even stage III patriots)and slapped them on would i see 420rwhp?

Jason 98 TA

iTrader: (4)

Do you have data on what the heads flowed?

JakeFusion

iTrader: (7)

Like I said before, stock LS6 heads with a FAST 90 and an F14 would be above 420rwhp typically. Any decent ported head should get you at least 10-15rwhp more than a stock LS6 head. Some of the better heads can get you 30-40rwhp more. I'd say the Darts would probably get you around 440-450rwhp typically with your setup. So, if your engine was a bit weaker than average, I could still see 420rwhp in your case.

SlickVert

iTrader: (5)

I’d recommending calling Allan @ FMS.
Talk with him and look at a balance approach to your set-up.
He will be best to help you meet your goals as you already have his cam.
Good flowing heads, compression and match camshaft are only a few key points to having a balance set-up.
Good luck,
Bob

slow trap

iTrader: (22)

the budget stage 1 ported 243s are a great value right now.with them and your mods 420 should be very reachable.maybe a .015-.020 haircut or a thinner gasket and 430 + if no p/v clearance problems anyway.