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When timing a 1987 454 class A home there is 2 timing plates one at 2 oclock and one at 4 oclock when timing @ 4 oclock seams like it is 90 degs off should it be timmed on another Cly. ?
In Rv, there is so much stuff in your way to get at the timing mark, it why there is one at 4 Oclock so you can time from under at 4 oclock with #8 cylinder.
wrench