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  #31 (permalink)  
Old 09-15-2013, 06:38 PM
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Originally Posted by 1Gary View Post
Wring out every dollar you spend for the street and build towards low end torque and say the hell with HP.Not talking about a tractor pull engine but off idle on where these 400's like to perform.
With the th 350 behind it I got all the low end torque I need lookin to improve the top end

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  #32 (permalink)  
Old 09-15-2013, 07:04 PM
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A cylinder head swap really wakes this motor up.
The stock 997 heads are pretty lame. (265HP)

pretty much any high performacne cylinder head you bolt on this is a
big improvement.

Stock pistons. Dished, flat top?
what is it going in? what rear gear ratio?

is there enough in the budget for new aluminum high perf heads?

Last edited by F-BIRD'88; 09-15-2013 at 07:10 PM.
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  #33 (permalink)  
Old 09-16-2013, 06:09 AM
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Originally Posted by F-BIRD'88 View Post
A cylinder head swap really wakes this motor up.
The stock 997 heads are pretty lame. (265HP)

pretty much any high performacne cylinder head you bolt on this is a
big improvement.

Stock pistons. Dished, flat top?
what is it going in? what rear gear ratio?

is there enough in the budget for new aluminum high perf heads?
Has stock pistons for now but looking to go with flat top and 5.7" rod and it's goin in a 1987 gmc short wide stock gears in rear end
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  #34 (permalink)  
Old 09-16-2013, 09:49 AM
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Two things with a piston swap.Check the all bores with a dial bore gauge especially the thrust side.If needing a bore to straighten out the bores back to round,do no machine work unless the intended pistons to be used is in the hands of the machine shop to properly size the bores and sonic check the bores on a relative thin walled engines and only finish bore only with torque plates.

Secondly watch your SCR/DCR's with head swaps and flat tops/5.7's.Diffidently buying good quality aluminum aftermarket heads is a step in the right direction.These engines like intake runners in the range of 195CC or for low end 180cc's.
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  #35 (permalink)  
Old 09-16-2013, 11:32 AM
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if useing flat top pistons DO NOT use a 64cc head.
The cr will be too high for pump gas..
look at heads with a 72 to 76cc chamber.
Brodix IK200., Profiler 23deg, etc

a 64cc head needs a 18cc to 22cc dished piston on a 400SBC build.
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  #36 (permalink)  
Old 09-17-2013, 08:30 AM
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Quote:
Originally Posted by F-BIRD'88 View Post
A cylinder head swap really wakes this motor up.
The stock 997 heads are pretty lame. (265HP)

pretty much any high performacne cylinder head you bolt on this is a
big improvement.

Stock pistons. Dished, flat top?
what is it going in? what rear gear ratio?

is there enough in the budget for new aluminum high perf heads?
Is that 265hp sae net or gross?

peace
Hog
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  #37 (permalink)  
Old 09-17-2013, 09:28 AM
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Sae net horsepower was introduced in 1972. 400sbc started 1970. They started as 265 HP. I assume gross. Knock off 20% and that is the real horsepower to the rear wheels.

Last edited by lg1969; 09-17-2013 at 09:36 AM.
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