ProComp/Speedmaster aluminum heads

As for the guides....... I don’t know if the quality has improved with them in recent years or not.
But that certainly was a point of concern with most Chinese heads at one point.
I had some ProComp BB heads used on a tractor puller that the guides were absolutely trashed in with fairly short run time.
I believe there were some geometry issues with that motor as well, which I suspect was at least a contributing factor to that.
On the other hand, I’ve had some Ede heads come back to me for multiple freshenings through the years, and Ive never had to replace a worn out guide.


From my perspective, as someone who doesn’t have to pay to have heads done, my preference is to pay a little more and use the Ede heads.
They have good quality seats and guides, the valves are decent, and I don’t worry about the springs and retainers(if they’ll work for the combo they’re to be used on).
The guides are always too tight, so I get to hone them to my preferred clearance...... instead of they’re a little loose, and it is what it is.

But, I realize with the cost of the RPM heads, plus a little machine shop love..... they too are getting kinda close to the TF heads in terms of cost.