02-04-2018, 05:59 PM
Many thanks for the input gents.
I have decided to lap new valves into the existing seats and see where I get to. A previous owner had the engine rebored by a professional outfit 10 years (but only 1000 miles) ago and had new valve guides at the same time, and I assume new valves as well. Quite why they didn't skim the block and do valve inserts while it was in bits is a bit puzzling. The car is a 1934 Type 65 and the sports engine has the original, or at least original spec, crankshaft, so at some point I expect to rebuild it to get the crank crack tested and check the rear bearing. I'll skim the Chromidium block and get hardened valve seat inserts done at that time.
The angle across the block and valve seat and into the port appears to be a straight 45°. I think it's just the crud above the seat that gives the stepped appearance Ian referred to. Attached photo is number one exhaust which I have started to reface using the old valve, and which I think should then lap in ok with a new valve.
Just wanting to get it on the road in time for the sunshine, although it was snowing here in Leeds this morning, so working by the open door of the garage is a bit character buildng!
I have decided to lap new valves into the existing seats and see where I get to. A previous owner had the engine rebored by a professional outfit 10 years (but only 1000 miles) ago and had new valve guides at the same time, and I assume new valves as well. Quite why they didn't skim the block and do valve inserts while it was in bits is a bit puzzling. The car is a 1934 Type 65 and the sports engine has the original, or at least original spec, crankshaft, so at some point I expect to rebuild it to get the crank crack tested and check the rear bearing. I'll skim the Chromidium block and get hardened valve seat inserts done at that time.
The angle across the block and valve seat and into the port appears to be a straight 45°. I think it's just the crud above the seat that gives the stepped appearance Ian referred to. Attached photo is number one exhaust which I have started to reface using the old valve, and which I think should then lap in ok with a new valve.
Just wanting to get it on the road in time for the sunshine, although it was snowing here in Leeds this morning, so working by the open door of the garage is a bit character buildng!