Re: 356 CI Compression Ratio

Posted by 53 Cavalier On 2024/7/23 1:30:19

PRH's are very common, I have encountered many of them in my 53 Cavalier. (Packard Rabbit Holes) Sometimes there's a hole within a hole within a hole, and not unlike the movie Inception, you get in so deep that it's hard to remember where you even started.

When I bought my 53 Cavalier it was not running and had been parked for years, maybe decades. After I got it running it had a tapping sound, not a knock and not a tick. I tried all sorts of things to see if it would go away, but ended up opening the engine, which lead to 8 rabbit holes!

Anyway, I too found that #4 also had the worse valves, in fact I'm 99% sure that my tapping sound was an extremely worn exhaust valve guide on #4.

As far as why, I don't know. Maybe #4 runs richer and hotter?

If you pull your valves, I would check the clearance on the guides.

If you happen to find any of the rabbits making all these holes, KILL THEM!!!