Need a head recommendation
Need a head recommendation I need some heads for a new build I am doing for my 4th gen.
It is as follows:
400 sbc standard bore
scat crank 3.75
5.7 rods
flat top 4 valve relief
block deck .015
cam
solid roller small base
112 cl 108ls
dur. .050 246 254
lift .550 .550
race car only
shift at 5800 to 6000.
28" tire 4.33 gear
th400 with a 2.75 1st, 1.57 2nd, and 1 to 1 high
convertor around 4600-4800
3200#
It is as follows:
400 sbc standard bore
scat crank 3.75
5.7 rods
flat top 4 valve relief
block deck .015
cam
solid roller small base
112 cl 108ls
dur. .050 246 254
lift .550 .550
race car only
shift at 5800 to 6000.
28" tire 4.33 gear
th400 with a 2.75 1st, 1.57 2nd, and 1 to 1 high
convertor around 4600-4800
3200#
TECH Regular
Joined: Oct 2004
Posts: 411
Likes: 0
That's not a very big window...4800 stall and 5800 shiftpoint.
I think with a cam like that in 400 cubes, a 210-215cc head from Dart or AFR will want a shift point closer to 6200-6400. If she's got good rod bolts, let her fly..
Check out the cam card...I'm not sure why people choose a shift point...Seems logical to put it on a dyno and see where it makes power and choose from there at least...and ultimately run it at the track using various shift points, recording data and timeslips and see what it likes best. Am I wierd? Don't answer that...
Bottom line: It'll fly with that converter/gear/trans combo at 3200lbs!! I see it reving WELL past 6000 through the traps with big mph. Goodluck!
I think with a cam like that in 400 cubes, a 210-215cc head from Dart or AFR will want a shift point closer to 6200-6400. If she's got good rod bolts, let her fly..
Check out the cam card...I'm not sure why people choose a shift point...Seems logical to put it on a dyno and see where it makes power and choose from there at least...and ultimately run it at the track using various shift points, recording data and timeslips and see what it likes best. Am I wierd? Don't answer that...Bottom line: It'll fly with that converter/gear/trans combo at 3200lbs!! I see it reving WELL past 6000 through the traps with big mph. Goodluck!
a race car only, but you don't want to punish the car?!?! you can't have both. a race car is made to push to the limits, not to pamper and cruise in. let it spin until the powerdrop and shift right before the drop accurs to keep your rpms up for faster runs. as for a head, i have always been partial to brodix for a small chevy but trickflow has some very nice heads for the sbc now also.
Staging Lane
Joined: May 2008
Posts: 75
Likes: 0
From: Florida
400 ci motor for out of the box heads look at a set of AFR 210s for the ET you want we would also need to know the race wt. of the car. I also like the dart 215 heads out of the box work well also. I think you will need to spin it harder also.
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With thats cam you'll want heads in the 195-210cc range.
You dont need anything with spectacular high lift numbers since your cam is on the smaller side.
I have a set of World Sportsman II's on my 400 with some work done to them and they make great power. Motor dynoed 531/529 at the flywheel with them, a RPM manifold and a Hyd. roller cam with .586/.562 lift.
You dont need anything with spectacular high lift numbers since your cam is on the smaller side.
I have a set of World Sportsman II's on my 400 with some work done to them and they make great power. Motor dynoed 531/529 at the flywheel with them, a RPM manifold and a Hyd. roller cam with .586/.562 lift.
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