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| Mechanical and Engine Tuning and Mods Found a way to add horsepower by tuning a few parts? Have some questions about Tuning your own engine? Well post them here and learn from other members. |
This is a discussion on Lifters, push rods, and compression -- 390 within the Mechanical and Engine Tuning and Mods forums, part of the Tech Forums category; Hello all, Recently replaced the exhaust manifold gaskets on my '66 390. Had noisy lifters as well, so I decided ...
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01-25-2011, 07:56 PM
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Lifters, push rods, and compression -- 390
Hello all,
Recently replaced the exhaust manifold gaskets on my '66 390. Had noisy lifters as well, so I decided to replace them. So far so good. Got things back together and it started up ok, but somewhat rough. Went back a couple days later to tune it up but it wouldn't start. Checked compression. Several cylinders were very low while others had no compression. Read an article mentioning new style lifters would result in pushrods being too long. I believe the valves are not seating 100% therby resulting in the lack of compression. I kinda thought the hydraulic float would absorb the difference. Anybody run into this kinda thing, and how did you resolve? Thanks, John 
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04-22-2011, 01:29 PM
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Kapejo: I don't have the exact answer to your question yet. I suggest you check your valve clearance per the shop manual. That would involve collapsing the lifter and measuring valve stem to rocker clearance.
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