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Best head for a boosted SBC

General engine tech -- Drag Racing to Circle Track

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Darbikrash
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Best head for a boosted SBC

Post by Darbikrash »

SBC 407" Dart SHP block for twin turbo application. With a 75 cc chamber I'll be around 9.3 compression. Cam not selected yet, but will be a hydraulic roller.

With this compression, I'm thinking an aluminum head would be best. Pistons are 4.155 dia Mahle 16 cc dish with SCAT 3.75 forged crank and rods. Not changing the bottom end at all.

Any suggestions for the best alum head for 15-20 psi boost? Port it? Use out of the box?
mag2555
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Re: Best head for a boosted SBC

Post by mag2555 »

20 psi and 9.3 comp you say?

On what fuel?
For a head choice I would want one that has a seat incert big enough to allow a up grade to a .1.625 or better " Exh valve .
Orr89rocz
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Re: Best head for a boosted SBC

Post by Orr89rocz »

I ran chad speier heads on my 401” sbc. 9:1, 24 psi on pump gas just fine. Air water cooled.
I ran his v2.72 heads but doing it over again i might be inclined to try his v2.50 based profilers. They are somewhere around 227-235cc and work well. I was hyd roller as well

No need for bigger exhaust valve but may want a wider seat cut valve job for heat management

I have also run afr 195’s out the box and it was great. Only ran 15 psi tho
rustbucket79
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Re: Best head for a boosted SBC

Post by rustbucket79 »

What pump gas supports 24 pounds of boost, even at 9:1? EFI? Knock sensors?

I would have though that much boost would be C-16 territory.
Orr89rocz
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Re: Best head for a boosted SBC

Post by Orr89rocz »

rustbucket79 wrote: Tue Jan 14, 2020 9:18 pm What pump gas supports 24 pounds of boost, even at 9:1? EFI? Knock sensors?

I would have though that much boost would be C-16 territory.
93. Good tuning and cooler iat with efi is possible. Also good head chamber im sure. It made over 1000 whp. Ran 8.8’s at 3750 lbs
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