Originally Posted By Alchemi
So apart from valve shrouding, has anyone seen any reason no to put these on a 4.280 bore? if the lift is kept under .600 it should be all good?

I mentioned this in a prev thread and the guy from trickflow came back with it would fit, but they just speced the larger bore size because of the 2.19 inlet valve... no other tech explanation other than "because"...

them being 10% off at summit atm is a deal clincher for me, will have to see if i can generate the coin b4 they go off special though, 5 days argh (and if they have any left!)

Edit: ahh (expletive) it, Im going to blow something up in the trans or the diff if i do use these guys, too much power, too much compression, too much stall needed. Im going to stick with the sidewinders, 500 ish hp is enough for my build/budget.

Still would like some opinions on the idea though smile


I put them on a 4.250 bore with a .039" gasket and the intake valve hit the cylinder wall at .770" lift. On the exhaust valve the retainer hit the seal at .850" and hadn't struck the cylinder wall.