Disagree on the no, the new intake seat will be .065" further out, and the old seat cut away.
Looks like there's lots of room between the valves. The 2.19" intakes that markm mentioned should fit fine. Same on the 1.88" exhausts.
I BBC seen many a 781 & 049 head machined to accept the 2.19. 1.88 valves with no issues. I agree with Rick the larger valves will be on new metal.
Last edited by markm; 10-24-2018 at 03:46 PM.
That picture is from before they were installed. I don't think there is a leaking valve, I get 205 to 210psi cranking compression all around. On the valve I think you see a mark in some carbon from a wire brush. I do see the little cracks in the seat though, or is that in the casting? I haven't the slightest clue how big around the hardened seats are but it sort of looks like the cracks stop at the seat?
What I'm seeing is that there are radial marks on the outside of the pressed in seat, but they stop short of the outside diameter of the valve. So I don't see anything on the actual seating surface. They may or may not be actual cracks.
What you may be up against if you go to bigger valves is that you may have to start over and replace the pressed seats for bigger ones. A little measuring would confirm or deny this.
They are just light weight springs. You replace your normal valve springs on one cylinder, use the same retainer and valve locks. This way you can rotate the engine to different degree settings and push the valve down with your finger. I use the back end of a dial caliper to see what the reading is. Your're looking for the difference between full height and open height touching the piston.
Remember the "13"
Rotate the engine to 10° BTDC on overlap. Put a dial indicator or caliper on the exhaust valve and get a zero reading. Push down on the exhaust valve retainer with your fingers until the valve hits the piston. Measure again. The distance the valve moves is your clearance.
Rotate the engine to 10° ATDC on overlap and repeat the procedure on the intake valve.
On a solid lifter engine you don't even need checking springs. Just use the regular springs and the lash adjuster.