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Old 06-04-2008, 11:03 PM
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Vortec 383 Build

Trying to decide on an engine build for my camaro.
1977 Camaro, Turbo 350 Trans, I have both Stock converter and 2500 stall converter. 3.08 gears with 295/50/15 tires in the back.

This is what im thinking-
383 stroker, 906 Vortec heads 1.94/1.50 valves with minor port work done
Flat top pistons, not sure what else needs to be done to get 9.5:1 comp
Dual plane manifold either edelbrock performer or performer rpm
freshen up the old rochester carb

Now i need suggestions on camshaft i would definatly go with a roller but would also like to keep costs down. I tried a 258 XR comp cam od desktop dyno with this setup and i show some nice 450 foot pounds of torque and about 350 horse.

Plans- Would love to try get 20mpg out of this thing. I will drive it as much as i can afford the gas to so about 4 times a week minimum and it will definatly be seeing a few drags againts the other guys in town and maybe a trip to the track. Tell me whatcha think, would a 350 be alot better on gas. I just want some nice street performance that i can actually afford to drive. Thanks in advance, Jake

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Old 06-04-2008, 11:19 PM
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Performance and mileage do not work well together. Assuming of course you mean real performance.

More performance = more gas

More cubic inches = more gas

More performance + more cubic inches = more fun.

Why the 906 heads? You could put a better head on there, be more efficient and make more power. How much you gonna spend?
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Old 06-04-2008, 11:43 PM
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MPG+Power

If you want the best of both worlds, you need to work on efficiency, not size. Look at ways to reduce rotating mass and overall parasitic loss (friction, accessories) of the drive train. Using a stick helps as you do not lose the up to 70Hp that an old school TH350/ 700R4 drains. Also, lighten everything except for your rods. Valves, retainers, pistons, crank, flywheel, everything. Every pound you save frees up power that you would have lost. Roller cam and rockers may cost more but are much more efficient as well, not to mention will last longer thanks to the new EPA standards for lubricating oil. My last bit of advice is to get injected. Newer Camaros, GTOs and Corvettes all make big power and still knock down 20+ MPG on the highway. Use those cars as your base and build from there.
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Old 06-05-2008, 12:10 AM
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[QUOTE=jake_arcticcat]Trying to decide on an engine build for my camaro.
1977 Camaro, Turbo 350 Trans, I have both Stock converter and 2500 stall converter. 3.08 gears with 295/50/15 tires in the back.

This is what im thinking-
383 stroker, 906 Vortec heads 1.94/1.50 valves with minor port work done
Flat top pistons, not sure what else needs to be done to get 9.5:1 comp
Dual plane manifold either edelbrock performer or performer rpm
freshen up the old rochester carb

383 with Vortecs & flat tops = 11.08CR with .025 deck height .041 HGasket
383 with Vortecs & 4eyebrow=10.14CR
383 with V........ & 14ccDish = 9.54CR with .025deck & .041 HeadGasket
Still have to use 91-93 octane gas with 9.54CR & iron heads..
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Old 06-05-2008, 07:19 AM
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We have done a few 383 engines with the 906 castings and run 10.5 compression with no problems, Remember the Vortecs don't require much timing compared to most 23 degree cylinder heads and are less prone to detonation.

The ones we have built have been around 500 FT pounds of torque and 455 horse using a HYD. cam and pump gas.
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