1/20/25
I have been slowly working on things here.
I decided after the Lobe failure, to examine the Spring pressures. This is an old Jeffery Head, and I never checked the spring pressures. Ken at OCG says to try to get ~120# Seat Pressure at the installed height and 250# open for this cam.
The Seat Pressures were good, but the open pressure was high, so i ordered a new set of PAC Catalog MoPar springs and they will knock down the open pressures.
While I Had the head apart, measured installed heights and checked all of the new springs at their installed and open heights. This head had no Shims anywhere under any of the springs. I found out that It has nice Ferrea Chevy Valves @ ~1.8 and 1.5 with 11/32" Stems. There are no seals on the exahsuts, Just on the intakes.
I ordered some 0.015" and 0.020" valve spring shims to more closley match the spring pressures and Installed heights.
At the same time I cleaned up all the gunk on the backside of the intake valves and observed the seats - It looks like 2 Exhaust valves have practically no seat area on them... so Off to the machine shop it goes tomorrow, for some seat touch up work.
I wanted to avoid heading to the machine shop, but it is not so this time.
I also Am going to change out the oil pump. I had a nice, light Aluminum rebuilt stock unit in there, but with my extra oil pump gear sprayer, I was never happy with the Oil pressure.
This replacement unit needed some massaging in the casting, which I do on all of my oil pumps now when I get into a slant 6 build.
Head on the bench, with cruddy Intakes.
Dirty Valve Right,
Cleaned up Valve Left.
I am no trained expert, but this seat contact width seems too small to me.
This pump casting could use some massaging in certain areas.
Excess Flash:
Smoother and some radiused flow around the bends.
With lots of snow shoveling, plowing, sled riding as well as trips to the mountains, progress has slowed down a bit on this project.
We have not had winter for 4-5 years so i am thoroughly enjoying this cold and Snowy January 2025!
It also is projected to be -10° F this week, so I probably wont get back to working on finishing the valve cover until the temperatures go up again.
Fortunately, my engine assembly area has heat so I can work on getting the oil pump painted, installed and as well as the oil pan set on the engine this week while the head goes back to the Machine shop.