Goopy Custom 12A Rotor Housings !

[Libor]

Originally Posted by GorillaRE

I like the idea here but..... The spread on the spark plugs in the 13B housings and the 12A rotor trench, are different for a reason. By changing the width of the "cylinder" and not adjusting the rotor trench and spark plug spread, you may be doing more harm than good?

-J

Maybe, but we have to take into account fact that it was compromise in the first place - power at full load vs. low load fuel economy and emissions...