Inliners International Forums General Discussion Engines 235 valve springs

I used Buick 455 valve springs on a 261,good for about .475 travel. These are a single spring with a flat inner damper.The spring fit fine on the head seat, a bit tight on the stock spring retainer. Used a set of inexpensive aftermarket retainers intended for oversize springs on Chevy V-8. The springs installed height was Buick spec,a bit more length than the stock spring.Required no shims.The Buick springs are about 10 percent stiffer.