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  #16 (permalink)  
Old 08-20-2012, 08:43 PM
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If I still had the five speed the motor would destroy it. The user refers to my original driveline. There is a T56 6 speed in there now. Everyone I've talked to say for a street car the 383 is the better build. Get more low down torque and its not as high strung as the 350 or 355. What is so wrong with a 450 horse 383? Thats considered a medium build that is loads of fun on the street. I'm not after the ten second quarter mile. Even the machinist said that it would be a nice motor. I already need to rebuild this motor, so why not stroke it out? I see no shortage of guys running Vortec heads on 4-500 horse motors.

The only thing I'd save on running the 355 would be the crank cost. As I would be able to reuse the factory crank if its viable. If the Vortecs are so bad on the street why are they so popular for builds like what I have? Sure I'm leaving performance on the table, but why go further when on paper that power figure will get me in line with several modern sportscars in the quarter?

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Old 08-20-2012, 08:50 PM
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So you're telling me these....would be better?

Dart 127322 - Dart SHP Special High Performance Cylinder Heads - Overview - SummitRacing.com
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Old 08-24-2012, 11:17 AM
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383 vortec biuld

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Originally Posted by L695speed View Post
XE282HR camshaft at .510/.520 lift and duration of 230/236 at .050 lift. The block bored .030 over, factory 5.7 rods to save the money, along with Sealed Power speedpro flat top with 4 valve relief pistons with a Eagle aftermarket 3.75 inch stroke crank. rod length is said to be 5.7 with that crank, says external balanced. The balancer is the stock 8 inch one which I could have checked at the machine shop to be sure its balanced right. Compression would be at 9.7 with 64cc chambers.

Domed pistons would send the piston into the heads from what I read, unless they're inverted (dished).
9.7 is way under for a flat top, my 383 vortec is at 9.73 and that is with KB 18cc D-Dish pistons., i use a camaro flywheel, it has a lot of metal drilled out a one side to balance and i use a 400 8" balancer. i use the 270 magnum cam and gear drive, It pulls like a mule, you,ll need a good clutch when the 4 barrels hit. Pay the extra 50 or 75 bucks and have the 5 angle cut in on the heads, i dont know what that cam will be like clearing the rod shoulders but i had 2 that hit and 2 that were close.
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Old 08-24-2012, 11:51 AM
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heads for 383 chevy

No, F-BIRD'88 said these heads Brodix IK200. See post #21.
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Old 08-24-2012, 12:09 PM
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350 or 383 that is the question

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Originally Posted by F-BIRD'88 View Post
You are hell bent on building a expensive lame 383 that won;t make 450hp that will cost way more
than a dirt simple cheaper 355 that will make 450+hp.
Spend the money on heads. build a simple 30 over 350 (O decked) with flat top pistons and 64cc 200cc port heads.

This 355cid combo will outperform your lame 383 plans.
I didn't know there could be such a thing as a lame 383, a Vortec one at that!!

Personally i don't see how a 383 can be built that isn't a stump puller, the short block should be built by someone with a bit of experience but other than that it's pretty strait forward, it's a bit more money but well worth the investment, I can't imagine anybody who's ever driven a 383 ever wanting to promote a 355!!!
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