intake valves

Discussion in ''Da Nailhead' started by gsgtx, Nov 29, 2016.

  1. 8ad-f85

    8ad-f85 Well-Known Member

    The Nailhead or any engine will come in at wherever the induction limitations leave it.
    Your statement is entirely true if someone were to leave the heads completely stock, even if adding carbs, cam and headers.
    Bob (66gsconv) has developed some of the best flowing heads for these, even surpassing some of the industry's best.
     
  2. gsgtx

    gsgtx Silver Level contributor

    with Bobs latest heads on the car, the big block with even with a little extra stroke now is pulling all the way to 6000 RPMS. first to high shift is now set at 5500 RPMS. am not running a real big camshaft either.
     
  3. 8ad-f85

    8ad-f85 Well-Known Member

    I forget the car's specs and exact times but it isn't tough to reverse engineer a corrected dyno curve...aaand I'm pretty sure you are a ways past 365 hp (torque curve still being more important).
     
  4. telriv

    telriv Founders Club Member

    Joe,


    The stock tulip valves vary in cc's because the tulip is deeper on some than others. I have measured between 3.7cc's & 4.1cc's.


    Tom T.
     
  5. gsgtx

    gsgtx Silver Level contributor

    thanks Tom.
     
  6. 66gsconv

    66gsconv nailhead apprentice

    Hi f-85, TQ is what I was trying to keep with the heads on joes car. It is tough getting the heads to really go with a engine that is all ready together and you don't want to drop compression ratio. With Mcsa , throat and shrouding. After reading a lot on pts and speed talk ect. I belive its about air speed rather than pure cfm on a flow bench. As for as the original post if I found out one set of valves was 30 grams or so more than another set I know which one I would want for my skylark GS. I think the skylark GS is what we were talking about here. I think it was Buicks performance model. I don't think anyone is trying to make it rev like a 302 ford or a sbc. I have heard about and trying to read up on reving intensity??Joe and me just tried to get his and mine to peak around 5300 to 5500 and keep tq high. Very tricky to do for a non professional head porter that is just playing around with these nailheads. And like Joe said the fresh rebuild was weak and didn't run like a nailhead in a skylark GS should. As for putting a nailhead in a pickup truck I think it's awesome. I have been kicking around a 62 through 65 Chevy short bed and putting a nailhead in it. In that set up chances are you would not need to rev it like a sbc. John as for TQ it was pretty interesting to read the sbb forum with mr Farmer arguing big 2 barrel and 2 inch exhaust. I don't know about anyone else but I love for my skylark GS to roll along at 20 mph and punch it and it just kites up the tires in 1st , 2nd and third and when I say third I am taking about burning rubber at 30 mpg and the tach is reading 5100 rpm. After talking to joe he says he can run 50 mph and stomp his peddle and burn rubber and start to go sideways. That's with a 2 speed with 323 gears. Everyone has there own opion about what there nailhead should do or how to build them or the parts they want to use. I just want my buick performance model to run like a hot street car. Hope this gets through I am on my phone at work and break is over.... That is all... Lol
     
  7. Gary Farmer

    Gary Farmer "The Paradigm Shifter"

    Long live low-mid range torque and the ST300! :grin: :TU:

    It may be 'boring' for some, but not for others!
     
  8. 66gsconv

    66gsconv nailhead apprentice

    Nailhead and TQ is not a problem. Even if you start building them to run faster they build more TQ with the HP gain. I remember when I was 15 and my friends older brother had a older beat up 65 wildcat. He was always drunk and when he would go somewhere he would burn rubber no matter what direction he was pointing.. Lol after one ride with him you never did it again. I remember my friends and me saying how bad ass that old " 445 wildcat " was. Touch the gas peddle and it would start spinning the tires. This was around 1974 and you could never drive around like that now.. Lol
     
  9. Gary Farmer

    Gary Farmer "The Paradigm Shifter"

    Sounds like they don't really need any more torque. lol

    More importantly than how much it has, is where it has it in relation to your gearing. :TU:
     
  10. gsgtx

    gsgtx Silver Level contributor

    i like the 2-speed because am getting old, only have to shift one time from low to drive. lol. :3gears:
     
  11. GOSFAST

    GOSFAST Well-Known Member

    One of the valve combinations we've used over the years included in our Nailhead builds are a 1.940 " SBC intake turned down to 1.880" and a 1.600" SBC exhaust turned down to 1.570".

    The intake valves end up at 108 grms, with the exhaust's at 102. These are nominal numbers, different brand valves vary some. Both we've used are Speed-Pro valves. There's a huge side benefit to stepping down the OEM guides to accept the .343" SBC stems. You will pick up some add'l flow!

    The final lengths allow the stock location to remain for the rocker arms to be bolted into place also. The "spring seat to valve tip heights" dimension stays the same as the OEM size.

    Thanks, Gary in N.Y.

    P.S. This is the valve arrangement running in Tom T's friend's Henry-J up in Massachusetts. I believe it's been running better than 10 years now, maybe more?? How you doing Tom??
     
  12. telriv

    telriv Founders Club Member

    Better now Gary. Back in June I felt I wasn't going to make it through July. Today I'm quite away from that low point.

    P.S. Thanks for the CARD!!!


    Tom T.
     
  13. John Codman

    John Codman Platinum Level Contributor

    Geez! I didn't capitalize three I's. :confused:
     
  14. John Codman

    John Codman Platinum Level Contributor

    That's true of my model T as well! :grin:
     
  15. Bigpig455

    Bigpig455 Fastest of the slow....

    Tommy can give more detail about stem height, but on my heads that Bob in St Louis.. um..."consulted" on, we used chevy 11/32 valves turned down to 1.90 and 1.52 I believe.

    Joe - is that where your heads wound up too?
     
  16. gsgtx

    gsgtx Silver Level contributor

    Rhett, the first heads were 1.94-1.50. they got ruined and Bob sent a pair with 1.90-1.52 he was playing around with. with those heads the car ran the fastest at 12.38. now I have another set on the car with 1.94-1.50, there are not track or dyno tested as of yet. Bob took some time with these to try to better the last set. I did drive it with this last set and it pulled better after 5700 rpms then the 2 sets before. but like you know we can't tell till we get some track numbers.
     
  17. 66gsconv

    66gsconv nailhead apprentice

    the heads that Joe ran the 12.38 with were 1.90 / 1.55. It was a pair that I was playing around with and he wanted to try them. The new heads he has now are 1.94/150. the new set was done concentrating on the lifts up to .500 and not worrying about .600.With what was done I was surprised to hear it ran better up top. We were shooting for more TQ and power between 4500 and 5500.I don't think trying to get some more power in that rpm range is asking fore to much. As stated before, cfm is not everything. A couple runs at the track will tell if it worked any better:TU:
     
  18. 8ad-f85

    8ad-f85 Well-Known Member

    It usually will run better up top with more mid lift flow, vs high lift flow...it's a common misconception for vice-versa.
     
  19. 66gsconv

    66gsconv nailhead apprentice

    I agree, and the new heads are not opened up as much and was surprised that was the first thing he said he noticed. That was not what we were trying to accomplish. I did try a couple of defferant things on this set that didn't show up on the flow bench. I think they might of worked. Guess we will see this coming Sumer. Nothing like having all winter to think about it.
     
  20. gsgtx

    gsgtx Silver Level contributor

    all rebuilt and running good so far, lots more power. running Toms rockers, longer rod and a 3.69 stroke light weight pistons and 750 carb. mild solid lifter cam. hair soft of the line but pulls to 5700 rpms with power. built for a mild driver, no headers. left the new 2.25 exhaust pipes on so far, that came with the car. now it runs like a nailhead should lol
     

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