Posted by skip33652 on February 16, 2008 at 17:10:04 from (69.77.210.29):
In Reply to: 400 chevy engine combo posted by troubles on February 16, 2008 at 16:28:23:
if you are really interested in building an engine as described I will give a bit of advice.first compression is power no two ways about it but running a 10.5to 1 400 with aluminum heads at 5,000 ft. above sea level is one thing 10.5 to one at 500 ft and iron heads is another.you can run about 1/2 of one point to one point more compression with modern aluminum heads than you can with any chevy head except maybe the vortech head.
the next piece of advice I have is unless you have a flow bench dont waste very much time porting beyond some port matching and a bit of bowl work the rest will probably only lose power. and again almost all the aftermarket heads will outflow any of the chevy heads.
next is proper bluprinting and machine work paying close attention to deck height as well as quench area also the longest rod you can put in there will help 6" is what I would do.
as far as cam advice call a cam rep (of your choice comp and crane are two good ones to start with) when you get the rest figured out. if you pay attention to small details you could really build an immpressive torque monster but mix and match too much and you will end up with a gas guzzler the will get outrun by a 283.Paul
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