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My 396 motor build details; input and thoughts welcome

2.2K views 13 replies 8 participants last post by  mr 4 speed  
#1 · (Edited)
Here are the specs on my motor build for my 1969 SS396 Chevelle. The block is the original numbers matching 396 (350hp 2 bolt mains) for the car, I built around it with the condition valve lift fit under the stock valve covers.

Setup for 91 octane pump gas, 700r4 and 3.73 12 bolt behind it. Also used edelbrock performer aluminum oval port heads and matching intake.

I built this to be a torquey, reliable, quick off the line street motor, not a drag race 1/4 mile beast. She dyno'd 455hp @ 5700 rpm with a long, wide torque curve; this was before any break in. Thoughts on the specs? Hydro roller cam and roller rockers. Not sure on piston specs/brand, I know my guy built this for 91 octane.

This is how she sounded heading in for a dual 2.5" exhaust, this is open headers. When we put it in reverse, mmmm, delicious lol

Thoughts, input and even easy upgrade options are much appreciated, thanks everybody! Mike

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#5 ·
How much TQ did it make like 450 foot pounds at 4,200 rpm? Good choice on cam for what you are doing. What carb is under there? What is all the color tube stuff on the driver inner fender?
It is over 400ft pounds from below 3000 rpm on up. Holley 670cfm Street Avenger. That color tube stuff lol is 1/0 wire heading back to the trunk for my high end Alpine/Zapco/Phoenix Gold/Boston Acoustics PRO/Morel semi-vintage audio system :)
 
#8 ·
I ran that cam in a 496. Made great power, but was a little too radical for my taste on the street. It's going to be even rowdier in a 396. You're going to need a fairly high stall speed, and I personally hate loose converters for street driving. You might like it fine - it's all a matter of personal preference.