Quote:
Originally Posted by Rick Shirey
Several years ago I purchased a set of 441 cyl heads from a super stock racer who guaranteed me that were not cracked and I thought I asked if they were super stock legal. I just recently started to disassemble them and noticed that the intake valves measure at 2.02 and not 1.94. My question is, can I have all the seats replaced in order to go back to the legal valve size of 1.94? Thanks in advance for any and all input.
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Yes....Its legal to replace the seats. NHRA OK'ed this a few years ago and IHRA has allowed it almost forever to save rare hard to get casting from becoming junk.
If possable find a shop that uses an adjustable cutter for the seat and guide machine such as a K.O. Lee machine so you can use a little more interfearence (approx .004) fit for the seat ring than the non adjustable standard cutters so they won't come lose and fall out from the hi RPM use. . Make sure the shop uses a sealer/locking liquid compound and freeze the seat rigs before installing them in a warm/hot head. With this method I never had a failure in over 40 years of replacing seats. Use a little more interfearence fit when installing them in alum. heads.