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  #1 (permalink)  
Old 04-19-2009, 08:38 AM
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400 sbc build tell me what you think

the engine is a early 70s 400 sbc 509 casting .30 over
with rhs 64cc vortec heads with 170cc runners
cam lifters rods pistons from a summit kit saying this engine should build 350-375 horsepower (with everything else stock)
cam has hydraulic lifters with roller rockers on top the heads
offenhauser intake i believe is a single plane
10.5-1 compression ratio

and looking to run nitrous does all this seem to be able to hold a 150 shot for weekly drag and occasional driving

also cfm carb should i use for this setup thinking with the nos a 750 or 800?

85 buick regal considerably stripped out is going to be the recipient
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Old 04-19-2009, 09:39 AM
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What pistons? what rods?
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Old 04-19-2009, 12:41 PM
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the rods are aftermarket from summit but they are stock specs the pistons are hypertech domes
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Old 04-19-2009, 02:01 PM
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You can contact various nitrous company`s that will tell you how high you can go. with a dome hyper piston on race fuel I wouldn`t go over a 100 horse shot. Make sure you have a top notch ignition system from the point of ignition to the plus. Nitrous hit`s the intake at minus 128 degrees so a hotter spark is recommended. You`ll also have to retard the timing slightly with nitrous use.
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Old 04-20-2009, 04:25 AM
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For every 100hp start with 2 heat range colder plugs not hotter or you'll have detonation problems plus you'll need to go 2 degrees less timing and learn about reading the plugs, the nitrous directions should tell you this. It's wise to be conservative on your tune 1st time out.
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Old 04-20-2009, 06:14 AM
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domes? Reverse domes right? otherwise your compression is WAY too high. What are the cam specs? at 10.5:1 you're going to need a healthy sized cam. Heads are too small for that compression and displacement.
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Old 04-22-2009, 06:58 PM
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i found a set of afterburner headers that will fit in the cutlass any horror stories withese out their
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Old 04-22-2009, 07:05 PM
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oh and i also have the smaller 6 3/4 inch harmonic balancer should help twist it up a bit better
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Old 04-22-2009, 09:47 PM
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Good luck.
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Old 06-28-2009, 02:30 PM
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To go with the 6 3/4" balancer you will have to go with an internally balancerd flywheel/flexplate and crankshaft
Shane
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Old 06-28-2009, 06:53 PM
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Quote:
Originally Posted by machinestheman
oh and i also have the smaller 6 3/4 inch harmonic balancer should help twist it up a bit better
Do you think maybe there's a reason the GM engineers used an 8" damper with the 3.750" stroke???? Do some research into harmonics.
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Old 06-28-2009, 07:48 PM
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Quote:
Originally Posted by techinspector1
Do you think maybe there's a reason the GM engineers used an 8" damper with the 3.750" stroke???? Do some research into harmonics.
Am I going to run into problems with harmonics in my vortec 406 ? Internaly balanced crank,Its at the machine shop now having the rotating assembly balanced .
Shane
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Old 06-29-2009, 12:31 AM
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Quote:
Originally Posted by Chevrolet4x4s
Am I going to run into problems with harmonics in my vortec 406 ? Internaly balanced crank,Its at the machine shop now having the rotating assembly balanced .
Shane
Use an 8" neutral balance damper from a 350. Here's a rebuilt one for 33 bucks from Damper Doctor that uses a 2:00 O'Clock timing tab....
http://www.damperdoctor.com/Merchant...egory_Code=CHE
and here's the same thing for use with a 12:00 O'Clock timing tab......
http://www.damperdoctor.com/Merchant...egory_Code=CHE

Use a toothpick to apply yellow paint into the TDC groove on the outer damper ring so you can see it easily with a timing light.
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Old 06-30-2009, 07:35 PM
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Thanks
Shane
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