Working on my 1970 340. I have open chamber "O" heads (3418915B), 2.02 / 1.60's with tulip valves.
Just got the heads back from the machine shop after a cleanup on the seats and valves.
The combustion chambers are measuring an average of 78cc's, so they're going back to the shop to remove 0.020 from the deck surface. Approximately 4cc chamber volume reduction will give me the SCR / DCR I'm looking for. I want to avoid any machining on the aluminum 6-Pack manifold if possible.
The machine shop says what they like to do is machine the deck surfaces and give me the heads to do a trial fit on the block / intake and see if any further adjustments are required. If adjustments are needed, they can machine the intake sides of the heads.
What techniques do you builders use to check for proper fit of the intake manifold?
I've read of a method using plumbers solder taped to the intake gasket in several places and measuring the crush on the solder. Might try this.
What about using Dykem / bluing on the intake gaskets to check port alignment?
Since vertical position is affected, is the mesh of the distributor gear to the cam gear a concern?
Do I need to shim the distributor for clearance?
What about pushrod length?
When I checked piston to head clearance (flat tops with chamfered OD), at max travel the piston hits the edge of the open chamber. Am I correct in thinking that the piston to head clearance will not change since the piston will hit the edge of the chamber in the same place, but the piston to valve clearance will be reduced?
Any other things to check?
