Silverhawk_02TA

Well, I decided I want to break 450 at the wheels. I think a Fast 90/90 combo and a good set of heads should get me there. I picked up a used Fast 90/90 combo from the For Sale forum here, and I finally decided on a set of heads: the new PRC Stage 2 CNC ported Darts from TSP. Here's the specs on the heads:

2.02/1.60 62cc

Valve Lift Intake
.100" 74
.200" 153
.300" 209
.400" 260
.500" 296
.600" 320
.650" 324

I talked to Jason at TSP and he's gonna start on my set on Monday, and hopefully they'll be ready to go by the end of the week. When he finishes them up he's gonna measure the valve drop and see if they can be milled a bit while still maintaining good PTV clearance with my cam. That 62cc should put me about 10.75:1, but I'd like to shoot for around 11:1. He also recommended .051 cometics for good quench.

I guess I'm kind of sailing in uncharted waters with these heads, but I think they'll be good performers. I haven't seen any out of the box Dart numbers yet, and as far as I know these PRC's are the first CNC'ed Darts available. I have seen numbers from over at CorvetteForums on a set of hand ported Darts that gained 48 HP just changing heads, but that's about it. Jason also offered me a discount if I would be willing to do provide some before and after dyno numbers on these new heads, and of course I had to take him up on that offer.

So, I'll be baselining after the install of the Fast 90/90, and then dynoing again after the head swap. Anybody wanna make a guess as to what my numbers will be, Fast 90/90 and then Fast 90/90 + heads? Closest guess wins a prize!

Compstall

iTrader: (5)

So I guess you aren't selling the car now?

Silverhawk_02TA

Nope, largely due to the general lack of interest and the fact that I probably couldn't get what it's worth. I figure when I go to New York I'll just keep it registered at my parent's address in NM to get around emissions, and get a beater truck or Jeep for the winters. Besides, I know I would have regretted getting rid of her until my dying day.

Nathan

if you're dyno'ing in NM... you're not going to see 450HP at the wheels with those mods.

i'll bet on it.

Silverhawk_02TA

Nope, not in actual numbers. SAE corrected is a whole different story though. I dyno about 400 uncorrected at sea level, and 400 SAE corrected way up here at 5000 feet, which equates to about 320 uncorrected. I've been to the track out here on days when the DA was over 9000 feet. Just one more reason I can't wait to get out of NM.

WAHUSKER

iTrader: (4)

How can you go wrong with Dart heads? Let us know what the numbers are.

Silverhawk_02TA

Indubitably. TSP posted some more info about the PRC Dart heads in the LS1-LS6 forum, or clicky here .

My1st Truck

iTrader: (8)

Curisous to see some numbers with those heads.