69 Z/28 Day II Project (Air Force Brat)

[outlawperformance]

Trick Flow DHC heads you can paint them and they look like the originals.

[NorCam]

Originally Posted by outlawperformance

Trick Flow DHC heads you can paint them and they look like the originals.

Been there...done that. The problem with DHC heads is that they will not accommodate the large diameter 1.550 springs needed for this roller cam. The top guy at Trick Flow (forgot his name) warned me not to try and cut them. Max spring pocket on the Trick Flows is 1.470 and they are best suited to hydraulic roller cams or smaller solid lifter cams. That being said, I could dump my existing cam and change the heads but that's throwing good money right out the window and downgrading a lot of performance at the same time. I think I'll just mount the Victor Jr back up and call it a day until I finish the next DZ motor. Again, I can swap the engine out later.

[rszmjt]

[QUOTE=NorCam;1532725]Been there...done that. The problem with DHC heads is that they will not accommodate the large diameter 1.550 springs needed for this roller cam. The top guy at Trick Flow (forgot his name) warned me not to try and cut them. Max spring pocket on the Trick Flows is 1.470 and they are best suited to hydraulic roller cams or smaller solid lifter cams.


FWIW. - 186 heads can not be safely machined for 1.550 springs either, the end spring pockets are prone to hit water, you can step cut them with a .060 stock diameter shim in place and then use .100 long valves, but this may mess up the rocker geometry.

Plus you will probably lose 40+ HP.

Maybe you could find a Orphan Tarantula Intake manifold ( or period correct ) and have the tops of the intake runners Tig Welded up/ground down, to work with your current heads?.