Head casting 3231475-2 questions
I picked up a pair of heads a few weeks ago from a guy who knew little about them or what was done to them. There head casting number 3231475-2 which I beleave is originally a 78 360/401 casting. However these have had alot of work done to them. I measured the valves across the diameter in the chamber and came up with 1.87 intake and 1.59 exhaust. Are these some type of SBC valves? Casting numbers show these heads as 360 heads so should have had bigger valves originaly. A slip of paper I found stuffed into the intake port said 71 304 head with SBC valves. They are set up for screw in studs as well. Ports have been pollished and chamber smoothed out alot too.
What puzzles me is I would think to install smaller SBC valves these heads would have had to have new smaller seats pressed into them. I can see no evidence of this but I don't have a way to compress the valves to look closly either. Am I measuring the valves diameter correctly? Could these actually be 71 304 heads with the smaller 304 valves? I'm guessing not and they were 360 heads built with smaller SBC valves, but larger then standare 304, to run on a 304.
I'm looking at a 401 that I might want to run these on but would want to install the 360/401 valves into them. Can that be done on these castings if they infact have smaller seats for the smaller SBC valves?
Thanks for any info or suggestions...
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