NosLaser

Car in question is an '01 Z and already has the following mods:

XS 1 3/4" LTs
off road X
titanium bypass exhaust
Ed Curtis streetsweeper HT cam
stock fast 78mm intake
stock ported throttle body
ATI 10% UD damper
all the requisite supporting mods (springs, pushrods, etc)

Car made 420/402 in 93 degree humid Florida summer heat

I want to send out my heads for the PRC stage 1 porting (only difference between that and the stage 2.5 is stainless valves; flow numbers nearly identical and I plan on milling the heads so I don't want PTV issues)
Heads milled to 59cc chambers (with .056" compressed gasket should yield 11.1:1ish compression)
Proper length pushrods
Vengeance racing ported Fast 78mm intake (since I already have it)
Fresh dyno tune

Anyone have any idea where I may end up horsepower wise? Could i see almost 460 out of that setup?

zeevette

I think you'd be closer to 440-450 with a Stg. 1 porting/milling. If you want to max out your potential, spend the money on either (first choice) Trickflow 215s, which are already CNC'd, and will present less PTV issues, or (2nd choice) get your stock heads done at TEA, or AI. Another thing you could do yourself, is home port the FAST manifold. It's pretty easy.

NosLaser

Only reason I'd shy away from the TFS heads is simply because I have 1 3/4" long tubes and my cam I don't believe would bring the full potential out of those heads. I'd rather be on the "faster" end of a smaller setup than on the "slower" end of a wilder setup if that makes sense.

"Oh you have trickflow heads and only make xyz horsepower?" due to not having some big donkey dick cam.

I'd rather the car be able to run a pretty decent number at the track and when I tell people they are only stage one stock ported heads, it will seem more impressive. Just my take on it.

zeevette

I , too have 1.75" LG headers, and they are plenty large enough for a 346, even with supercharging. Not an issue. I don't know what specs your "named" cam are, but I was very happy with my first cam. (Crane 228-232@112+5, and .600/.600 lift) I only recommend TFs because of the outstanding outcome (NA) with a smallish cam. 483/432RW SAE. I also had the heads milled to 61cc for more compression, and they were hand finished by Brian Tooley about 8 years ago. I've since added an A&A Vortech, and changed cam to a 224-234@116, and sold my ported FAST, EWP, and UD pulley, going back to stock parts. The headers are handling it just fine.

NosLaser

Good to know

Cam specs are 228*-232*-111*-.612"-.600"

bikeriderga

I would agree with Zee here.

NosLaser

Only argument I could really make is from the perspective of cost. With 346 cubes and my cam, the car is only going to make so much power.

The PRC heads are going to cost me $750. Trickflows are ~1300 plus the cost of rockers (or the upgrade required to use stockers) and plus the cost of machine work to have them milled for my desired application.

With the PRC heads I'll make 450's to maybe 460 if the stars and planets align, with the trickflows I'll make 470-480ish.

To me, all things considered, I don't know if double the cost is really worth it, but my mind may change.

zeevette

Everything comes down to a cost vs sort of deal. I've never had PRC heads, so I can't comment of your results. I think you'll like the cam you chose.

NosLaser

Sorry to revive my older thread, but if I were to go with a set of AFR 205's, could I reuse my existing lunati dual valvesprings and reuse my stock rockers?

Been in talks with Ed Curtis (the supplier of my cam) regarding some head porting that will best match the cam I have, but I'd consider a set of AFR's if they are more of a bolt on deal without the downtime, and if the cost isn't too crazy different.

Box stock AFR's outperform ported 243's?

zeevette

AFR 205s are also CNC'd, and they will out perform stock 243. Even better are ones done by Tony Mamo. They can come with good, or better springs, so switching isn't needed. I still prefer the TFS, and they offer a really good alternative in the 220 "as cast" configuration that are also less expensive.

Scotty2000SS

Honestly I would sell the fast 78 and go fast 102/NW 102. You'll pick up huge with the cam you're running. I ported my 102 myself and it gained big. I followed this thread. It's not the normal "porting" that vengeance does.

https://www.corvetteforum.com/forums...g-results.html

zeevette

You have big cubic inches, (454!!). which benefit from the larger manifold. A FAST 78 only works with the 3 bolt TB, but the larger FAST' need a LS2 type 4 bolt. For NOS setup, I think a 90 or 92 would be more balanced, negating the need for cowl modifications. It would require a LS2 TB, which I found new for only $200. Just my .02.

NosLaser

In his defense, that thread was made for reference, that isn't his car. If you look in the "Performance Results" section and find the thread on the 442 rwhp bolt on car you will see his results with the NW102/Fast 102 combo on stock cubes.

I'm skeptical on the numbers but if the track times end up supporting his numbers then that would tell the tale of the larger 102 intake's efficacy on even stock cam cars.

Scotty2000SS

Thanks for the props

I'm going to the track tonight

NosLaser

See just cause I'm skeptical and slightly sarcastic doesn't mean I'm a dick

Good luck, keep us posted on the results.

Dave70

The PRC's are a great bang for the buck head. I had them on my 99 WS6 with a MS3 cam. Had that top end on the stock LS1 and put it on a 6.0 after a spun rod bearing. Great heads for the cost. I had the stage 2.5 milled .30

cv67

nothing wrong with skepticsm at all.....give mamo a buzz he will give you the straight scoop on either one & break things down so they make sense.
(Have no idea what stage 1 is so cant comment)
He definitely knows how to make power and keep things acting/sounding tame.

radar502

https://www.youtube.com/watch?v=Cm-U...ature=youtu.be )04 LS-6 Comp harden cam ( there is a difference ) 230/236 595/595 112-4 home ported stock heads the intakes just cleaned up the exhaust open up ,if you don't know what your doing do try this at home ,I have been doing it for years .. Kools headers X-pipe GHL ..LMR tuned in Houston TX 445 at the wheels .. Run very good on the street not 600-800 HP but fun ride ..