youd need to take 0.1" off the guides and fit double springs to be on the safe side.
using the 4.0L pistons inplace of the 4.6 will increase compression - its a fair common practice.
if you were thinking about fitting a cam that has more than 0.44" of lift then consider the viper stump puller cam.
using the 4.0L pistons inplace of the 4.6 will increase compression - its a fair common practice.
if you were thinking about fitting a cam that has more than 0.44" of lift then consider the viper stump puller cam.
I am building a 4.6 .With the piper 285 cam did you have to machine valve guides,change springs etc?I also run on LPG,and have read that you can run higher compression when on gas ,makes for a more efficient burn?in my garage i have a set of 4.0 pistons .i read on turners site you can use these with 4.6 crank to raise compression to 9.75.Has anyone done this mod with a high lift cam?and did you have to get pistons machined so nothing hit?my heads have previously been skimmed already due to an overheat,14 thou I think,when the top hats are done the block decks will also be refaced I presume,so again bringing everything closer.thanks for all the replys