Quote: Is bushing the lifter bores required, or not crucial with the modern solid rollers with oiling provisions?
The block I have in my street rod/drag week car is not bushed... I have it idling at 800 but I went with the EDM hole on the lifters to supply added oil to the roller... I believe I will UP the spring pressure by another 30# to give me 280# on seat... I think its starting to bound the lifters at 6700 rpm(with 250#) but it could just be the cam ran out
