Can dual plug Hemi Heads be run single plug by plugging the unused holes? If so, will a standard, single plug valve cover work? Thanks, Joel

1. Yes
2. Yes(?)

1. Yes
2. Yes

Why not run the dual plug cover and fire just the
one plug

Absolutely as long as you get the plugs and plug tubes in the correct locations on both heads

All the cool kids fire both!! All MSD inside, PM me if interested.

Go to page 5 of elephant hemi for sale, 1/3rd way down page. There is a pair of dual plug valve covers with both block off plates for sale.

Those superlightweight stamped aluminum Mopar covers that use the block off plates are unusable. You would be leaking more oil than the Deepwater Horizon.

Are all Hemi valve covers the same height top to bottom?

I think so.

cast covers might be different in size,all the steel ones should be the same

Definetily not! Street Hemi heads versus K heads and the different part numbers on the spark plug tubes makes me think that as well as how many spark plugs tubes I've seen with the bottoms pulled out by the spark plugs I've seen two different Mopar brand spark plug tubes that use two different spark plug seals to the covers I seem to remember that the 1966/67 Street Hemi covers and tubes being different from the 1968 to 1971 street hemi covers, tubes and seals
I assembled one motor that had a set of KB cast alumnum covers on Dart aluminum water heads that required buying thier (KB) tubes to make the tubes fit correctly in those covers