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Author Topic:   487X runner size
sledgehammer
Member
posted October 05, 2003 11:47 AM
I have not been able to find any solid information about the runners on the 487X heads. Does anyone know what the runner sizes are? Also how do these heads breath compared to a vortec. I know the chamber size is different but I am considering milling these heads to get the chamber size lower. Any information on these heads would be appreciated.

Thanks
Jim


BK19
Member
posted October 05, 2003 01:01 PM
"487" 3973487, OR 3973487X. The regular casting was found on the 1971-1972 350 LT-1 engines, had 1.94/1.50" valves, 76CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's. The 487X had 2.02/1.60" valves.



15a
Member
posted October 05, 2003 02:59 PM
i have one complete 487X head for sale , if anyone needs it....in Iowa make offer
also a few 487 heads too....thanx ford5


sjakes8
Member
posted October 07, 2003 07:19 AM
Ford, check you pm!

Thanks



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