On one hand, the thinking is that it takes a long time for the lead to wear off the exhaust valves and actually cause a problem. It happened to me on my '73 Sonett, but in this case, the valves had been re-ground at one point, losing whatever lead was left on them. So it happened to me. The first thing you notice is that you have to adjust the valves more often and the exhaust valves are really tight. So you adjust them more and more often- you get really good at knowing when it needs to be done based on how it runs. Then one, day, it runs awful and you do a compression check and you have a cylinder with 60 psi or less. No big deal- swap in some heads. Most of us have accumulated a half a dozen sets.
On the other hand, I don't think there are drawbacks other than the cost of whatever product you choose and remembering to add some in every now and again. Seems like this has been hashed over a while back, but the stuff you buy doesn't really have much lead. Some products are better than others.
Of course the best thing to do is put in hardened exhaust seats.
eric in vermont
posted by 65.199.61...
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