I'm starting the build-up process on a set of unposted "G" heads that will go on a near-stock 292. Had them Magnafluxed and pressure checked, but as this might be a good time to clean out the rust/scale I noticed in the coolant passages, I am tempted to fill/soak them with a commercial flush solution. But, if the scale is sealing a hidden crack, I would have to lug them back and pressure-test a second time to avoid wasting a lot of work. What do the pros normally do? Is it worth the effort to soak them? Should I fill/drain with Stop Leak afterward?



I will have to pull/change the temp sender bung. Does it need to be pressed in, or just fitted/sealed with J.B.Weld?



I milled off about .007" just to square them up initially, but may take off up to .010" more after most of the work is done. I'm thinking a clean-up cut off the intake/manifold surfaces will insure a good gasket seal, even after the block is zero decked. But, my question concerns some of the pitted sguish surfaces left outside the combustion chambers. Is it normal to mill them flat when doing a good build-up (assuming the cut does not exceed the CR/manifold seal/head thickness limits)? Will it hurt to leave any pitting?




6 VOLTS/POS. GRD. NW INDIANA