340 X Head Valve Options
Hello FABO,
Got my X heads back from the valve job. The shop was really impressed with the small stem of the Hemi valves. With proper porting and bowl blending they said the heads should make good power. They had to cut the 2.08 intake down to 2.06 to get it out of the hardened exhaust seats, 2.08 is probably a little too big anyway.
Next step will be spending some time with a carbide burr to blend the valve job cuts into the bowl, gasket match the intake, and smooth everything out. Not looking to get crazy here, just some common sense clean up. Then finish the intake off with 80 grit, exhaust 120 grit rolls.
Once porting is done the heads will go back to the machine shop to clean up the deck, cc the chamber, and maybe flow the heads to see where i'm at on flow.
Still have some geometry to work out since the exhaust stem is shorter than the intake. Might need to buy a different spring to work with my lift. Picked up a new in box COMP CAMS XR274HR-10 from a swap meet. Not a crazy amount of lift but I need to check coil bind.
Thanks for all the help and ideas FABO.
Hello FABO,
Got my X heads back from the valve job. The shop was really impressed with the small stem of the Hemi valves. With proper porting and bowl blending they said the heads should make good power. They had to cut the 2.08 intake down to 2.06 to get it out of the hardened exhaust seats, 2.08 is probably a little too big anyway.
Next step will be spending some time with a carbide burr to blend the valve job cuts into the bowl, gasket match the intake, and smooth everything out. Not looking to get crazy here, just some common sense clean up. Then finish the intake off with 80 grit, exhaust 120 grit rolls.
Once porting is done the heads will go back to the machine shop to clean up the deck, cc the chamber, and maybe flow the heads to see where i'm at on flow.
Still have some geometry to work out since the exhaust stem is shorter than the intake. Might need to buy a different spring to work with my lift. Picked up a new in box COMP CAMS XR274HR-10 from a swap meet. Not a crazy amount of lift but I need to check coil bind.
Thanks for all the help and ideas FABO.
