SBC 400 Cylinder Head Showdown

Discussion in 'High Performance Modifications' started by 1980RS, Jun 3, 2021.

  1. 1980RS

    1980RS Veteran Member

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    Here is something I remembered I have sitting around so tell me all what you think for the 400 cyl head swap. I will only be testing one set of heads so tell me which you think will be better and why?

    1st. up 906 Vorted heads LT4 valve springs and a 3 angle valve job, no porting

    2nd. up Phase 1 034 Bowtie heads, screw in studs, more valve springs, they are ported and ran 11.59 on my 358 with the Elgin 1165P hyd Cam.

    3rd. Phase V Bowtie heads all ported, fresh valve work and all the same stuff as the Phase 1's

    I want to do this head test on the 400 using the same RPM Performer intake and 268H cam.

    Let's hear it guys and if you don't like these heads I always have some AFR's, LOL.
     
  2. biker

    biker Veteran Member

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    Call me silly...I'm still voting for the vortecs with that combo.
     
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  3. G72Zed

    G72Zed Veteran Member

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    I would love to see this.

    1st- 906 Vortec's gone through, Flow test and weight the pair of fully assembled heads, CC to baseline actual CR. Track test/tune for best ET/MPH, note jetting/timing and vacuum through the traps

    2nd- AFR's, Flow test and weight the pair of assembled heads, CC to baseline CR. Track test/tune with the same setup as above, best ET/MPH, note jetting/timing and vacuum through the traps.

    Let's see what the extra CFM's and 35-40 less weight off the front really does in a very well sorted out car/chassis with a very consistent pro driver such as you 1980RS.

    Knowing your starting line weight, and track temps conditions, not hard to figure out net rear wheel hp gains. See what's gained in the 60-330 and 600ft, the full 1320 MPH will speak volumes on this.

    That would be downright interesting for many I would think, maybe even surprising.

    How many "hot rodders-part time racer gear heads" kicked their old home ported Iron ugly heads to the curb for nice high flow aluminum heads to only go to the track and run the same ET or not improve like they thought, or maybe actually went slower, and that's a kick in the gonads when that happens!
     
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  4. muscl car

    muscl car Veteran Member Lifetime Gold Member

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    I'd like to see track tests with AFR 195 cyl heads and maybe a difference between a set of ported vs custom ported AFR cyl heads

    If you can another test with AFR cyl heads , a ported 195 vs race ready 210's
     
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  5. 1980RS

    1980RS Veteran Member

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    If you would like to donate a set of 195's I would be happy to do that test for you, lol.
     
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  6. muscl car

    muscl car Veteran Member Lifetime Gold Member

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    I'd be happy to donate a set of 195's if you donate a set of 210's in return LOL !!
     
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  7. 1980RS

    1980RS Veteran Member

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    Touché, good one. :)
     
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  8. camaro71/holland

    camaro71/holland Veteran Member

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    Always nice when people take time to do such tests and are willing to share the results.
    What I would be even more interested in, is to see step by step tests with one of these heads by starting with a base line, make a change like a valve job, or opening the plenum, or changing to beehive springs etc and testing it on the track. But at the same time I know it is very time consuming and will cost a lot consumables.
     
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  9. 1980RS

    1980RS Veteran Member

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    I enjoy testing stuff and try to figure out how to get the most out of a combination. Right now the 100° heat is fighting me, not that I cannot do the work, it's just that the track and temp will be so hot the results may not be very good. Looking like June 30th will be the next test. I will need to recheck the 906's to make sure this set will not have any problems but I have the others just in case.
     
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  10. 1980RS

    1980RS Veteran Member

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    Racing a C8 80K Corvette at the 1/8 mile with a junk 400 and 487X heads.
    screenshot_20210617_201605.jpg
     
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