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16 Posts
Discussion Starter · #1 ·
these are the specifics its in a 71 240 z CAN I ADD NITROUS OR TURBO
Square and parallel decked
Align honed main bearing bore
Cylinders honed on computer controlled machine to within .0002 straightness and roundness
Cylinders are sonic tested for thickness
Rotating Assembly:
New SCAT cast crankshaft
Keith Black Hypereutetic pistons
Chevy heavy beam rods with 150,000 psi bolts
Hastings Moly rings
Balanced rotating assembly
Melling high volume oil pump
Flat tappet hydraulic lifter camshaft
Heavy duty double roller timing set
Cylinder Heads:
New Cast iron "vortec" heads
1.25 diameter valve springs
Hardened retainers and springs
2.02 swirl polished intake valves
1.60 swirl polished exhaust valves
1.5 long slot, stamped steel rockers
Hardened push rods
A Ton Of Extras:
Professional Products dual plane satin finish intake manifold
9.5 to 1 compression
New chrome valve covers
Brass freeze plugs
Dyno tested – and shipped with results

4 Posts
Sounds like a Premium 355 GM Vortec/Carb Horsepower-385 ,Torque-405 Part #BP3550CTC from Race Car Factory.
NOS is less expensive but be careful to do it right and use a window switch to limit rpm range. Turbo is always ready to go and is available for more that a short burst. It depends on your application and budget. Alot of guys in the Corvette forum can shed some light on the sibject.

Hates: Liver. Loves: Diesel
6,304 Posts
I agree on the compression thing. Unless you have very low boost and a sophisticated engine management system with EFI, knock sensors, atmospherically-based boost ignition retard, etc, I can't see a turbo happening without going to some alternate fuel; like insanely high octane race gas or methanold/ethanol.

Turbos don't have tanks that run out, and they are 100% based on your foot position. Cruising, its loafing along, but add more foot and you'll start getting boost. The big downside is the cost and tuning. Sometimes picking the exact right turbo takes a little trial and error for the right A/R ratio and ignition curve. Nitrous is cheap, but its kinda anti-climactic to me. You get a whoosh for a while and then its over. You get several of those whooshes and then you have to refill the bottle.

Do the math on how often you'll actually use nitrous, then extrapolate that to see how many years of bottle refills will offset the cost of a turbo installation. If you plan on keeping the car for a long time, it might be worth the extra investment to get a "set-and-forget" combo with the turbo.
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