PROS and CONS of a high compression head

[gwhite]

Originally Posted by PC/SR

gwhite: Weiand 7:1 head, carbs, cam, more speed stuff, no pressure oil except center main, babbitt bearings no problems. Personal redline is 4000 RPM. The limitation of the stock Model A babbitt engine is not compression but RPM.

I agree completely, just wanted to see where tbirdtbird came up with 7:1 as being the upper limit. IIRC, diesel engines used babbitt for many years with much higher compression ratios...