Reply to "Stroker engine vibration"

This has been a very interesting thread on engine balancing and I've really enjoyed reading everyone's two cents worth on the subject. I'd like to suggest a few easy items I'd check before tearing the motor apart to check for an imbalance issue:

1. Double check that the plug wires are routed correctly. SB fords have 2 different firing orders 1-5-4-2-6-3-7-8 or 1-3-7-2-6-5-4-8 depending on your cam. It's easy to swap the back 2 plugs on either side, I've done it. Motor runs like crap.

2. Visually check the condition of the cap and rotor, ohm test the plug wires for continuity.

3. Check the plugs(previously mentioned) They should all look about the same, an odd ball in the bunch is suspect.

4. Pull valve covers and check the valve train for broken springs, broken rockers, bent push rods, or other malfeasance.

I had a vibration develop in my Cleveland once. Turns out I broke a valve spring. It broke the very first coil and would still hold the valve closed, but didn't control it properly which resulted in the vibration. I got real lucky on that one, didn't hurt the engine at all and only a little pain on my wallet.

Hope this helps, If you want more suggestions or help with the trouble shooting, just ask........J