Thread: need head advice

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Hey Pat,

Correct me if Im incorrect but the orginal post stated "Flat top" 496. I assumed flat top he meant flat top pistons...Now I may be wrong but if you use flat top pistons in a 781 head (119 cc oval) or 049 head (121-122 cc oval) I think he will be lookin gat some low compression. Maybe Im wrong but I think with either of those large cc oval heads he is gonna need a domed piston to get in that 9.5-10 :1 compression range.

Originally Posted by 30-A Rider

Hey Pat,

Correct me if Im incorrect but the orginal post stated "Flat top" 496. I assumed flat top he meant flat top pistons...Now I may be wrong but if you use flat top pistons in a 781 head (119 cc oval) or 049 head (121-122 cc oval) I think he will be lookin gat some low compression. Maybe Im wrong but I think with either of those large cc oval heads he is gonna need a domed piston to get in that 9.5-10 :1 compression range.

not with a 4.250 arm it will be around 9to 1 at 119could get better with a good hair cut

I am not really looking to build a high compression engine. In this sport reliability is important. Mud pits change from town to town, sometimes i clear a pit in 5 seconds, sometimes 30. These engines run hot and we have to box them in to keep out the mud, so it it very difficult to get under the hood to fix problems or make adjustments. I once had a starter failure and had to let my truck run for 30 minutes between heats, so a high compression engine just leads to more problems in my sport. I like the idea of a custom grind making 17" of vac though.