Quote:
Originally Posted by Mike Gray
I don't understand the problem if porting, polishing, welding and epoxying is already permitted?
From rule book SS heads -
Must be correct casting number for year and horsepower claimed, per NHRA Technical Bulletins or NHRA-accepted. Cylinder-head casting must also be on NHRA runner volume list as published on NHRARacer.com. Porting, polishing, welding, epoxying, and acid-porting permitted.
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Look at it this way.If a cylinder head had 200 cc port volume and you mill away 20 cc's with this angle milling. You now have a head with 180cc's that you can open up to the 200cc spec. which then could perform like a non angle milled 220cc head. Why else would they do this?