Author Topic: McCoy 40 R/H thunder bolt (Read 1133 times)

Bootlegger · « **on:** December 30, 2021, 01:15:01 PM »

would a thunder bolt Red head 40 take a piston and liner from a series 21 40 block and make a ringed stunt 40 ? all help will be appreciated,,, Much obliged

Manuel Cortes · « **Reply #1 on:** December 30, 2021, 09:49:14 PM »

Hi Gil.

I think so, as I bought several years ago a called "hybrid McCoy 40" who has exactly that mod performed. What I don´t Know is if it is necessary some machining work to adapt the pieces.

Kind regards from Spain.

Manuel.

Dave_Trible · « **Reply #2 on:** December 31, 2021, 09:07:24 AM »

Gil it can be done but requires the case to be bored out several thousandths to fit the Series 21 sleeve. I attempted to do one recently by simply hogging it out with a grinding stone. I got the engine together but couldn’t get it to start by hand. I may take the electric starter next time I try. I think once it gets loosed up....

Dave

De Hill · « **Reply #3 on:** December 31, 2021, 06:18:03 PM »

It can also be done by taking the cylinder of a lightning bolt Mccoy .40 and using the rod and piston out of a series 21 Mccoy .40. Stick that assembly back into a lightning bolt Mccoy .40 crankshaft and crankcase.
Then you will have what you want.

Author Topic: McCoy 40 R/H thunder bolt (Read 1133 times)

Bootlegger

McCoy 40 R/H thunder bolt

Manuel Cortes

Re: McCoy 40 R/H thunder bolt

Dave_Trible

Re: McCoy 40 R/H thunder bolt

De Hill

Re: McCoy 40 R/H thunder bolt