Mopar Stage VI 6 heads questions

lol. I don’t think you are being a dick at all. As far as head work experience I have done steel heads in the past. I have my own equipment to do valve seats and valves. I have done port jobs on 906 heads using Mopar templates. I have not done anything in 15 years and just getting back into engine building. Everything I have ever done was for my own stuff and I try to use what I have because I have never had the money to do a big budget build. I do however have a big selection of Mopar big block parts that have been accumulated over 50 years by my family. These heads are my first aluminum heads.

Ok to get more specific question I was asking is if I use stock length valves, retainers, keepers and rockers what lift can these heads take? What I was thinking was at some time when the heads were marketed as using all stock parts that they would have listed the maximum valve lift with stock parts. I guess I was thinking along the lines of when I was working on 906 or 452 heads when I wanted a cam bigger than.550 I would have the valve guides cut down and maybe the spring pocket cut down.

After seeing a couple replies on here I’m thinking that the offset rockers would be for the max wedge port design that was offered in this head. Mine are standard port design but I didn’t want to assume that stock style rockers would work.


What lift you can use is determined by (the number one factor IMO) how much load can the fasteners and the shafts take? Five 5/16 bolt won’t take the load of five 7/16 bolts. Even the hood downs matter. Using OE style hold downs won’t take the load of a block system like the W series heads use.

And, in a similar manner, the W style rocker system will not take the load of a Jesel or T&D system. It just cant.

The other factor is length of valve and what your retainer to guide clearance is. You can machine the guide down and get more clearance.

The answer is if you can’t figure that stuff out, find someone who can. It’s not hard.

You can also change the length of the valves, but unless you or whoever is doing doesn’t understand correct valve train geometry you will make your world a very miserable place using longer valves.