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67 GT500 drag car

Discussion in 'Introductions and Greetings' started by 427gt, Dec 31, 2007.

  1. 67GT500#2100

    67GT500#2100 Shelby Forums Pit Crew

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    Could the 425 H/M intake be a standard Ford "425" horse 427 intake with a H/M name cast on it for retail sales?
     
  2. 427gt

    427gt Member

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    this is a possibility, what did the 425 hp intake come on?
     
  3. highland green

    highland green Well-Known Member

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    425 was the horse power rateing that Ford gave its 2x4 427 engine. It came in Fairlanes and Gallaxies. Perhaps Lee Holman could answer your manifold questions. He still runs H/M and has a web site, he even sells H/M stamped intakes. You can buy alum heads from many sources, water pumps from a few. Let us know of your engine plans and if you find any new information. You have just a great car and it has sparked my interest.Thanks for posting!
     
  4. 427gt

    427gt Member

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    i have e-mailed Lee Holman to see if he could help. the engine i have is a 66 427 built in december 66. it has been sonic tested for cyl. wall thickness and bored .030,parallel decked align honed with torq plate, has been blueprinted and balanced, 10:1 comp. crower roller cam, dove roller rockers, millidon oil pump, pent roof valve covers,an original aluminum water pump #xe126529, original heads #C6FE-6090-C, hollman moody 2x4 intake that looks like fords C5AZ-9424-G. i have not located an original harmonic balancer yet. i have built a set of 2 1/8" x 36" headers that will have cutouts under the middle of the car and run out over the rear end out the stock exaust tips. this is how the original owner says it was.
     
  5. Bob Gaines

    Bob Gaines Well-Known Member

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    FYI. I would think twice about using the C6 alumnum heads unless you are not planning on doing any hard running. The heads were not designed properly and although run on the MKII GT40's I have heard that they were replaced after each race. The relativly low compression of the GT40 engine helped . All sucessful drag race 427 used high- 12 or,13:1 compression which is a formula for desaster with those heads. The story goes (urban legend)that the Shelby race team back in the day wanted the heads quick and had them made simply by using already existing cast iron head molds and used aluminum instead of iron. The weaker aluminum would move around in the combustion chamber area and other places. I had a set of the C6 heads and used them on a 10.5:1 engine but continued to blow head gaskets until I changed to a set of edlebrock heads. I didn't have anymore problems.I sold the heads to Scott Minch who was building a vintage display engine. The C6 heads do look cool in any case.
     
  6. 427gt

    427gt Member

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    hi bob, thanks for the heads up, i took a look at the other head and it has a 6090-B , would this head have the same problem? both heads also have #sk33449 ingraved on them? this car will never see any serious racing as long as i own it.
     
  7. Bob Gaines

    Bob Gaines Well-Known Member

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    I am not sure what the production difference was on the B head. There had to be something. It is my understanding that both had problems. Mike Ulrey a friend and long time drag racer from back in the day was the one that told me that they had nothing but problems with them. He is the same one that restores the carbs . He is a great information source. The SK number was some kind of numbering system. They were on the heads I had too. I think the Boss 9 parts use something similiar. I think you have a 50/50 chance of not haveing problems. It might be worth firing and some brake in time on a engine test stand to verify the situation before all the work of the install especially when big block headers are involved. My problems manifested themselves before I even got mine to the track. After the second time of a blown head gasket and trying all the aluminum head installation tricks I called Mike and he gave me the low down. I know other people have used them but for how long and how hard I do not know. The nostalgia signifgance in your case is important. It would be worth it to talk to a builder who has sucessfully run them. You might call Mike or maybe kieth craft or cobra automotive. With a little machining you can make the edlebrock heads look pretty close to the ford heads. thats what I did. Worst case scienero run the engine with some dressed up edlebrock heads and have the Ford heads for display. I hope it doen't come to that but I thought I would offer a alternative if needed. I would definatly not run antifreeze in the engine until you get a few hours on it to confirm that the head gaskets are holding. I am just a little gun shy because of my past problems . The best of luck with the restoration . Let me know if I can help. Bob
     
  8. 427gt

    427gt Member

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    i was looking at dove enginerings web site and they can reproduce any head along with date codes, so they say. i haven' heard back from them yet but would this be an alternitive? they also had some part#s that were very close to the sk33449 on my heads. i will post when i hear back from them. thanks again bob.
     
  9. Charley

    Charley Well-Known Member

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    Just don't let Gaines drive your 427 car. Next thing you know he is racing Enzo's.
     
  10. 427gt

    427gt Member

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    hey charley, good advice, by the way have you ever had any trouble with head gaskets?
     
  11. Charley

    Charley Well-Known Member

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    Nope..Driven hard and runs fine. Even Gaines thrashed on it...How could he do such a thing knowing how fragile these heads are ?:lol:
     
  12. Bob Gaines

    Bob Gaines Well-Known Member

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    First off there was no second thought It was a honor situation . I HAD to try and uphold the honor of the Supersnake. I was pulling away from the Enzo and would have beat the Enzo if Ed Meyer hadn't distracted me with his little girl squeeling and made me miss third. Second, I was hoping I would have to fix it that way I could have had it in my garage at least for a little while.
     
  13. Bob Gaines

    Bob Gaines Well-Known Member

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    That sounds like a good alternative.Bob
     
  14. highland green

    highland green Well-Known Member

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    427GT if you are going the Dove route, talk to Dove but by from a dealer. DSC motorsports is a dealer and is in southern calf. I havent delt with him but he does have a web site and states all alum peices are pressure checked. At one time Dove had some perocity problems. Shelby heads are the same as MR heads and his roller rockers fit without interference on valve covers.Just a thought at precaution.
     

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