I did the 421 in my ^@ GP and a 4 cyc that was in my 63 Lemans.The GP got a 068 with a set of NOS GM lifters,the 4 cyc got a a factory regrind done by Isky also with GM lifters.Was VERY careful priming and sure all lifters were spinning when it was 1/4ed and primed.Used 10-30 dyno oil with a 1/2 bottle of EOS and a 1/2 bottle of STP.Fired them up,did the normal brake in and both engines as far as I know are running fine.Still own the GP and it gets driven a lot.The 4 cyc I assume is good as the current owner lives close and if it failed I would know.When I do a oil change on the 421 it gets the 10-30 dyno oil and also the 1/2 bottles of EOS and STP.FWIW,Tom
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