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- Pemberton, N.J.
The biggest problem with these Ambac pumps it those damn expensive timing buttons!!! That they apparently have not made for 50 years. And according to the manual there is a shim between the pump and the block that HAS to stay with the engine. Those are also unobtanium. And also no way of knowing what shim is needed if pumps are changed out and shim is damaged or destroyed. This is why I will be leaning heavily on Ray and Guy this summer when I do mine.
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