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Engine Balancing, Custom Engine Rebuilding, Cylinder Boring by Buds Machine and Engine Shop
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Machine Shops Services - BES Racing Engines
What I would do on any street/strip build....
1. Check main bearing bores for being round and parallel with each other. Align-hone or align-bore to correct.
2. Registering off main bearing bore, cut block decks to desired block deck height based on stack measurement and head gasket thickness.
3. Bore and hone with torque plates for next size piston and rings. Hone specifically for the ring material used.
4. Check for gaps at the intake manifold/cylinder head interface. This is best done after all the trial assemblies are done and after you have torqued the head bolts. I have even sacrificed a pair of intake gaskets for this. Torque everything down, then take the intake manifold off and inspect the gaskets for being pinched all the way around each and every port. If the manifold doesn't fit in between the heads correctly or is cut on a different angle than the cylinder heads, you will never get a seal there. If the gap is toward the outside, you will be able to find the vacuum leak by spraying a combustible material around the interface. But if the mis-match is on the bottom side of the ports, you will not find it with spraying. The motor will suck in oily crankcase vapors when the intake valve is open with the piston descending in the cylinder. You will get burned oil out the exhaust and fresh oil on the spark plugs. So if you guys pull spark plugs out that are oily and the motor is fairly fresh, you may now have an idea of what happened. This may happen only on one cylinder or more than one, depending on where the ports are not sealed.
If there is a gap, either on the inside or on the outside, it can be corrected by taking a cut on the intake manifold face that is equal to the angle of the cylinder heads. You will want to enlist the aid of a professional machinist to help you figure it out, how much to cut and at what angle. I'm surprised that this doesn't come up more often in discussions on engine building.
