A single plane with a throttle body would work just fine for a turbo app, as would the holley stealth ram if you want a different look.
The Accel Pro-Ram is a nice manifold; for a while Don had it on his Procharged Camaro and it was a really nice looking and well thought out piece. All the hard stuff you normally have to weld on with a carb'd intake are already on there-- fuel rail hold down provisions cast into the manifold, tapped ports in the back of the plenum pad for sensors, injector bungs, etc.
The single plane/throttle body combo is more forgiving for plumbing as you can put a hat on it and point it whatever direction is easiest for your turbo plumbing, whereas if you go with the stealthram you're stuck with a throttle body up front.
While not turbocharged, I'm still boosted, and I'm using a hybrid manifold; the lower is a holley stealth ram, and the upper is sheetmetal with extended runners which helps built a LOT more torque. The guy who did my manfold did some dyno testing and found that my style of intake (he builds slight variants based on the application) on a naturally aspirated motor is worth 70 ft/lbs more torque in the middle compared to a Victor Junior; now, consider that gain in torque and apply boost and you get a proportional gain. You could duplicate it or build something similar for about half the price of a Hogan's, but it's still not inexpensive.
I'd suggest something with longer runners to build lots of torque; since your turbos will be shoving air through the sucker the long runners won't become a top-end killer (a-la the GM TPI) at higher RPM. As far as readily available off the shelf intakes, I really like the Stealth Ram.
Speaking of burning a piston from mixture distribution, I think you'll find your carb bonnet is to blame. Most bonnets out there have HORRIBLE air distribution characteristics; I've heard of as much as staggering jets 10 sizes side to side to make up for the poor airflow characteristics of a given hat. There are only a couple good hats out there, and a LOT of bad ones.
Keep in mind if you run EFI with a single plane / throttle body and use a crappy hat, you may also have mixture problems cylinder to cylinder. Granted they'll all be fed the same amount of fuel at the port by the injector, but the amount of air each cylinder sees may be quite different! A good hat matters with EFI, too.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
Last edited by Blown353; 04-18-2005 at 09:21 PM.
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