Got the head back from the machinist. removed .050" which is as much as is possible considering the last pass ever so slightly skimmed the edge of the intake valve. I think it is only possible to remove this much because I had a 3 angle valve job done, which sunk the valves in a bit.
New combustion chambers are 47.7cc and 47.8cc which brings the compression ratio to about 10.6/1 which is a little higher than I was aiming for but totally fine.
I clayed the head and the combustion-chamber-to-piston clearance is now about .030-.040" around the edge which is much better. The clay i used was too sticky so it was hard to be super accurate, however it looks like there is plenty of room.
The only problem now is that because the head sits closer to the pistons the exhaust valve has pretty much a zero tolerance fit on the edge of the valve pocket, however there is ton of room for valve lift, 0.220"! I'm thinking about taking a dremel with a small sanding drum and just whisking the edge of the valve pocket to make room.
thoughts?
New combustion chambers are 47.7cc and 47.8cc which brings the compression ratio to about 10.6/1 which is a little higher than I was aiming for but totally fine.
I clayed the head and the combustion-chamber-to-piston clearance is now about .030-.040" around the edge which is much better. The clay i used was too sticky so it was hard to be super accurate, however it looks like there is plenty of room.
The only problem now is that because the head sits closer to the pistons the exhaust valve has pretty much a zero tolerance fit on the edge of the valve pocket, however there is ton of room for valve lift, 0.220"! I'm thinking about taking a dremel with a small sanding drum and just whisking the edge of the valve pocket to make room.
thoughts?