I was looking at the Rod and Custom articals, and have a question for other nailheaders. Has anyone used Chevy valves, springs, and retainers on there nailhead. How did you account for the smaller valve stem( Chevy 11/32, .34375 Vs. the .3720 of the Buick)? Are new valve guides able to make up the difference? Stock spring pressure is 101 lbs @ 1.16". The lowest spring pressure that I can find for a Chevy is a single spring with 280 lbs @ 1.187". Will a cam survive pressure like this? Will the stock head this kind of pounding? Will I have to go to hardend valve seats? Will the lifters even be able to pump up? Any help would be appricated.

Thank you,
Todd

------------------
1964 Riviera 425 cid