original ford head ,,what is the spark plug size,,gonna go git a compression gauge,,still got a miss
need it fixed next weekend is the WASP reuion here,,womens airforce service pilots,and would really like to give them a ride as this is where they trained at
well i think the same valve is trying to stick again,,very irregular miss,all plugs firing gonna go pull timer now just to check.
This thread will help with a tester:
For a stuck valve or mayor differences in compression it is easy to compare how hard the engine is to turn over on each compression stroke with the hand crank.
Once in awhile, sticky valves won't show up with a compression test. What can happen is that the valve closes, but too slow. Exact rpm will vary greatly form case to case and even on the same engine for a dozen reasons (like relative thermal differences or rotating bent stem). So under a hundred or even several hundred rpm, it will close and show good on the compression test. However, at higher rpm (500, 1000, 1500), the valve may hang up lowering the compression enough to make it run rough. I have seen valves that would hang up and then snap shut about a half stroke too late.
It is still well worth the standard check. If it shows up, you know what to fix. If it doesn't show up, you are no worse off.
Drive carefully and enjoy, W2
Sometimes, if the trouble is a sticky slow closing valve, simply putting in a slightly stronger valve spring may fix it. It may be worth just trying that on both springs in the offending cylinder just to see what happens.
"WASP reuion here,,womens airforce service pilots,and would really like to give them a ride as this is where they trained at".
Very few 'WASP's' left.