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FE Power Forums => FE Technical Forum => Topic started by: hbstang on January 06, 2026, 08:03:59 PM

Title: bore size on sohc heads
Post by: hbstang on January 06, 2026, 08:03:59 PM

any gains on running a 4.280 bore over a 4.250 bore with sohc heads?also,intake valves 2.250 vs 2.350?not a race engine , street and some strip time.

Title: Re: bore size on sohc heads
Post by: blykins on January 07, 2026, 05:42:13 AM

The valve size will depend on the brand of cylinder head and what size the throat already is. 

Title: Re: bore size on sohc heads
Post by: pbf777 on January 07, 2026, 05:49:29 PM

         As with the S.O.H.C. and the valves being angled toward the center of the cylinder and as the valves are opening they're moving away from the cylinder walls, probably not enough to justify chasing.   :)

         Scott.