Hi, I've been planning out a new motor combo and after much research I'm almost deadset on going with an ATI Procharger P600B. However I have a few questions for you blower-experts out there... First off here is the combo I have in my head. Remember this is all in the very early stages I need to do way more research and planning:

Shortblock:
My current 355 which has TRW forged flat tops,
C&A forged 5.7 I-beam rods, ESP cast steel crank,
studded 4-bolt mains, all ARP hardware, Plasma moly
rings gapped for nitrous use

Cylinder heads:
I'm thinking either AFR 195's with 74cc chambers or Dart Pro 1
200cc's with 72cc chambers. With the AFR's my (estimated)
compression would be around 9.2:1 and
with the Darts about 9.4:1.

Camshaft:
I'm thinking something like Crane Powermax solid
grind: 288/298 Adv duration, 248/258 @ 050,
.500/.520 lift, 114LSA. This is just an idea, might consider
a custom grind or even a solid roller.

Induction:
Holley Strip Dominator intake manifold and
(possibly) my current 750 Speed Demon modified for a blow-thru
setup. EFI is out of my budget right now but most definately
sometime in the distant future so I don't wanna hear about it

Now, here comes the questions.

1) What parts would you change? (No I'm not going with EFI!)

2) How much non-intercooled boost do you think I could push on pump gas? I know 9.x:1 compression is slightly high for a blown motor but I'm guessing I could get away with 10-12psi safely on 93 octane?

3) I've seen some pictures and done plenty of searches. Everything looks like it will bolt-up without any major modifications. Am I correct? I have no power steering, AC, or anything to worry about.

4) Is the P600B a good choice for a motor like this or would you consider maybe a D1 series?

5) What kind of power do you think a motor like this could produce? Do you think my bottom end would handle it (considering good tuning)?



Thanks in advance. I'd really like to hear some opinions on a motor like this before I begin making it a reality

-Chris

 

I dont say this often but you might go with a bit less camshaft. I wouldnt want to shift an I beam, i assume stock crank motor much higher than 6000 rpm on a power adder.

 

I agree about the cam... I'm leaning more towards the next-size down which is 238/246 @ 050. As you suggested, I'd also like to keep this motor's peak at or below 6000RPM.

Nobody else has any suggestions or experience with a carbed Procharger?

Thanks,
Chris

 

I just went through what you're going through with my malibu's motor buildup. Everything on the bottom end sounds good. You may want to go with a CR that's a little lower if you plan on running 10-12psi w/o and intercooler, but it may work with aluminum heads. I'm running iron Vortec's so I went with 8.5:1. I'd have the carb sent out to a professional rebuilder that specializes in blow-through applications, like The Carb Shop and SDCE. That seems to be the one issue that everyone is in agreement on at the blow-through boards I go to. Part throttle driveability seems to be the biggest difference everyone sees. Another thing all the "pro's" agreed on is to go with a D-series blower, but I've read about people having succes with the P-1sc also. As you probably already know, you need a boost referenced fuel system. I went with a mallory regulator and A1000 Aeromotive pump. I havn't run the car yet with my new setup, so take it all for what it's worth. This is just the advice I used in builiding what I have. Check out The Blow-through Carb board and http://www.gmabody.com HTH.

 

Without a intercooler you cannot run more than 8 or 9lbs of boost without detonation. some may argue you can, but most cannot. Also your carb is pretty big for your blow thru application.

 

yeah my pro charger literature says that a 650 mech. secondary holley will handle a ridiculous amount of horsepower.

Honestly, I looked into a centrifigal supercharger setup and decided that nitrous was the way to go for me. My 350 with vortec heads, 10:1 compression, the XE274 cam and port work already blows the tires off at any speed in first, and will actually power brake driving 35 mph in 2nd gear. A well built sbc will make more power than the street will ever allow for, and at the track you can have more horsepower at the touch of a button . I would someday like to build a centrifigal setup, but it will be EFI.

 

i wouldn't worry bout changing your intake, as it does not make "as much" of a difference on blown motors, and if your going to efi down the road then i wouldnt bother, also 10-12 psi non intercooled on 9.x:1 comp is pretty high, i'd say keep it round 6-8 psi untill you can get that intercooler, you will definately need one, even a little detonation and those i-beams and stock crank are done, also get AT LEAST a p1sc, if not the d1 series, might wanna take water injection into consideration too, theres a post on here from bottlefed, where he, and rooster433, talk about, and show pics of their home made systems, cheap and effective, but i personally would never consider it an alternative to an intercooler

http://www.jgstools.com/turbo/index2.html

if price is the reason to not get an intercooler cheack out this place, they got some good ones for $400-450, also check ebay, you can get em there for around $300, very good investment

 

might consider investing in a forged crank, prolly find a used one for less than $300, this company (www.ohiocrank.com)has a .010 under one for $295, look under the what's new section and also check ebay.