340 X Head Valve Options

SheSaid said
Hey thank man. I am listening.

The 1.80" installed height comes from stock specs for these springs as installed on a 6.1l hemi. I wanted to install them as close to stock height as I could so I could have the option to run as big of cam as possible. I see what your saying on geometry.

I also wanted as much install height as I can to avoid coil bind or excess spring pressure on the cam. I suppose that does not matter so much if I go with a roller cam.

Hardened seats are only going on exhaust side.

Sorry I'm a little confused what you meant on valve job and porting? So I need to have guides installed and then the valves roughed in to some extent, then port, then finish valve job and be done?

Appreciate all the help I can get! Thanks

Yup, that's what I'm saying. Your valve job sets up the rest of the port. You have to have enough area in the port to feed the bowl.

As for springs and pressure, there are springs out there for pretty low installed heights that will allow .600 plus lift.

I try to run my street stuff .090-.100 from could bind and the race stuff .050-.060 because I shim the street stuff once but when a race spring loses enough pressure to need shimming I **** can them. Had too many break on a shim deal and that costs money to fix.