I replied using Ron's reply first and then read the original which has more
detail. High lift rockers need a lot of clearance and so are VERY CLATTERY.
Looking at Vizard's book (page 331 in the latest edition) he pretty much says
what I said (I think he said it first) and his additional comments bear out
what my dyno guy says.
Finally, if David Anton says something I would be inclined to listen to what
he says because I doubt there is anyone on the list who is more experienced in
building engines and running them on the dyno than him.
Daniel1312
In a message dated 07/08/03 10:47:36 Pacific Daylight Time,
philip.s.jones@comcast.net writes:
> 286 cam, Titan 1.625 roller rockers, rwhat valve clearances I should be
> running. David Anton said that I should go about .016 intake/.018 exhaust,
> and that I could go as high as .020/.022! I am going to go with the tighter
> range, but I'm just wondering what the list thinks of these gaps. Note: I
> originally adjusted them to .014, and do get a small amount of valve clatter
> even at that setting. I would think that the roller rockers' point of
> weakness would be the impact shock of "taking up" the valve clearance at the
> time of ramp-up to opening. Perhaps I am mistaken?
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