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Technical Warped header flange

Discussion in 'The Hokey Ass Message Board' started by topher5150, Jun 20, 2021.

  1. topher5150
    Joined: Feb 10, 2017
    Posts: 2,688


    I'm using the speedway lake header kit and I noticed that the flanges are a little warped in the same spot. I thought it was from welding, but I only tacked the other one and it's a little high in the same spot maybe by a 1/16". Is there to take it down a bit or would the gasket take care of the that
  2. dirty old man
    Joined: Feb 2, 2008
    Posts: 8,912

    dirty old man
    Member Emeritus

    What is the thickness of the flange?
  3. Mr48chev
    Joined: Dec 28, 2007
    Posts: 30,832


    Got a buddy with a belt sander long enough to set the flange on and slick it off?
    topher5150 and VANDENPLAS like this.
  4. Try bolting or clamping the header flange to a piece of angle iron and heat the area where it is warped. When I make headers I always have the flange bolted to some angle iron or a cylinder head if available.

  5. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 1,434


    Did you happen to check the flanges when they arrived to see if they were flat? The higher quality thick flanges usually show up nice and straight, some of the lesser thinner ones could show up not so flat due to manufacturing or shipping. Usually straighten them up in the press. When welding, use TIG and bolt the flange down to a heavy top welding bench or old head. Once you build out away from the flange a bit they usually do not move the flange.
    Hutkikz likes this.
  6. I put a bead of high heat silicon around the gasket ports when I put the header on,and let it dry over night.Fills minor gaps.
  7. I would definitely (as has been mentioned) bolt the flange to an old, extra head then build the headers. Obviously, if this is a 427 SOHC, most won't have a spare head lying around but that is the route I would be taking if an extra head was relatively easy to find.

    I get that the warp is before welding but I'd hammer the flanges as true as possible, bolt them to the head once straightened, then proceed with header construction.
  8. egads
    Joined: Aug 23, 2011
    Posts: 1,229


    oldiron 440 likes this.
  9. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,818

    oldiron 440

    Those gaskets are great but very thick, sometimes it's hard to bolt them up... You need longer bolts first to compress then shorter for final fit, it can be a pain in the ass.
  10. topher5150
    Joined: Feb 10, 2017
    Posts: 2,688


    I think the bolts that came with are to short as is.

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