Quote:
Originally Posted by Model A Ron
Do you need to shave /surface the 5.5 or 6.1 prior to installing?
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No. It needs to be heat cycled first so the casting with move all it is going to move.
I am not here to dispute what John is saying regarding using a stock distributor, -however the 6:1 head is very, very similar to the 5.9 head that Larry Brumfield produced for years and years. These heads were used by folks with stock Model-A distributors for years. No one ever complained about having detonation issues. IMHO, most of this stuff is 'he said/she said' where someone said you need to have a centrifugal distributer with your 6.0 head or you will blow up your engine. Nothing could be further from the truth.
I have sent a bunch of engines out the door, an every one of them use a Snyders 6:1 that we re-machine the surface (-generally about 0.005") and install. Back when Larry first introduced those heads, 98% of all engines they were installed on were cast bearings. The only bearing failures that were talked about on the forums (Ahooga and the original Fordbarn) back then were generally attributed to poor quality babbitt work. Today, using a 6:1 head does not need anything different than a 5.5 head.