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Ted
Would you please decribe the difference between passive and positive rotators. My MB has both tapered and square valve spring retainer keepers and I assume that the square ones allow rotation. The valvetrain appears to be assembled with whatever parts were laying around at the time. Fortunately a previous owner installed hardened exhaust valve seats.
Dave Fillman
45 MB
---- you wrote:
> I've found that the "lead subs" aren't worth much. They have only
> given me about 10-12,000 miles on a base M38 flathead 4 before valve recession
> took it out.
>
> I've since gone the route of seats and good valves and passive rotators.
>
> >The 230 OHC is somewhat costly to do the valve job
> >on...the seats aren't too bad
>
> The M715 230 already has the harden seats and positive rotators.
> The civi 230 didn't and suffered the valve recession.
>
> On a soft engine, the "subs" only bought me a few extra miles. If you use
> these gas green machines at all, the engines get worked. They are not your
> typical Chevy V8 in an MB type machine (power to weight ratio) where you will
> never see this type of valve problem.
>
> Just some thoughts....
>
> Ted H.
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