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Old September 8th, 2011, 11:12 AM   #1
Lousypirate
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Default Heads for 400 sbc

Found a set of vortec heads for 125...
Didn't know how will these would work on my 400 sbc.
Would have the stream holes drilled, head milled, and do my own porting.

Not sure what I have on there now.

Any opinions? Any other good heads for my 400? Looking to go through it this winter anyways.

Thanks,
Jake
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Old September 8th, 2011, 08:12 PM   #2
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how big of a cam are you going to use? i ran into this problem for a set of vortecs i have. stock they will only go up to a .475 lift cam. after that the retainer hits the valve guide. you can get them milled to accept up to a .525 lift cam but it's usually not cheap for the machine work.
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Old September 8th, 2011, 10:24 PM   #3
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Right now I'm at .480 both sides... But the rpm range is too high. Want to swap cams and get some low end. You need a vortech head though too don't you? Does a crab bolt right up?
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Old September 9th, 2011, 07:11 AM   #4
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u will need the correct carb manifold for the vortec heads also known as L31 heads.
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Old September 10th, 2011, 09:31 AM   #5
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Quote:
Originally Posted by Lousypirate View Post
Right now I'm at .480 both sides... But the rpm range is too high. Want to swap cams and get some low end. You need a vortech head though too don't you? Does a crab bolt right up?
If your lift is that low, you may be fine with the heads as they are. I would also keep the cam that's in there and advance the CAM timing 4 degrees and see what that does for your low rpm power. Vortecs also have excellent flow curves for the lift you have - they drop off in performance as you get near 0.500" lift, but if you want torque on your 400, I think they would work quite well.

Modding a set of vortec heads for higher lift isn't too expensive - I talked to dave at enginecraft (enginecraft@aol.com) and, IIRC, I was quoted $150 to increase the lift capability of the heads - and that included a set of new springs good for 0.500" lift.

You will need an entirely different intake manifold to fit the heads - and if you have the room under the hood, I'd suggest a performance products dual-plane airgap manifold.
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