Hi folks. I'm building a high rpm 4g61, with a 4g63 head. I'm curious to know what are your views regarding the maximum rpm limit is, based on the design of these cylinder heads. Please don't flood with comments about not needing to rev the engine high at all. This project is being built for a...
--------------------------------------------------------------------------------
Has anyone tried using these on 4G63 Engines? They are supposed to extend the rpm limits of the valvetrain buy roughly 1000 extra rpm.http://www.racingsprings.com/beehivesprings.htm