Duke
Donation Time
Did some more measuring and observations -
My pistons are sitting .030 in the hole at TDC. They are .030 oversized pistons (have a 30 stamped in the center) so the pins were offset .020 to allow for block decking. Well, the PO did not have the block decked so instead of the .010 the piston should have, they are .030 down.
This creates a much lower compression ratio. So here is our plan, we will CC the combustion chambers and see what we need to do to get the compression ratio in the ~9.5:1 range. This may involve a .015 steel head gasket and some head shaving.
For valves - 1.5"(+.05) exhaust valves and 1.72" (+.05) intakes with larger stems will be installed.
It is all coming together to explain why this engine used so much fuel. Looking at the top of this thread at the first dyno, expect to see some really nice gains in power. The engine will do this using much less fuel.
I will post some pictures of the current condition of the valve seats soon.
My pistons are sitting .030 in the hole at TDC. They are .030 oversized pistons (have a 30 stamped in the center) so the pins were offset .020 to allow for block decking. Well, the PO did not have the block decked so instead of the .010 the piston should have, they are .030 down.
This creates a much lower compression ratio. So here is our plan, we will CC the combustion chambers and see what we need to do to get the compression ratio in the ~9.5:1 range. This may involve a .015 steel head gasket and some head shaving.
For valves - 1.5"(+.05) exhaust valves and 1.72" (+.05) intakes with larger stems will be installed.
It is all coming together to explain why this engine used so much fuel. Looking at the top of this thread at the first dyno, expect to see some really nice gains in power. The engine will do this using much less fuel.
I will post some pictures of the current condition of the valve seats soon.