Quote:
Originally Posted by X-TECH MAN
The 1964 427 Hi Riser engine has 2.197 intake valves and 1.725 exhaust valves. Does the NHRA (Dave Wren Hemi) rule still say Plus .005 and minus .015 tolerance allowed ?
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Yes, it is still +.005/-.015. The valves were 1.728 when they went in the heads. The one in question had been pretty deep in the seat and pushed an edge up to the margin.