Valve spring diameter question
 

The new trick flow aluminum double hump heads have two sizes of valve springs available, 1.460 and 1.470. I've looked at the specs on both heads and can't see a difference except for the spring. The heads with the smaller spring are more expensive and I'd like to know which spring is preferred and why.

Tommy

The 1.460" spring package is a double spring (inner spring as well). Will have more seat and open pressure, however they don't list any spring specs.

The 1.470 spring package is just a single spring, no damper.

Thanks, i completely overlooked that. Just compared specs again and I see it now.

Tommy