cub cyl ?

[Wheelman Chassis]

hey guys i have a 392 cub motor for my shee.. can i put a 4mil crank in it without changing the ports, can it even be done without changing the cyls?

thanks

[4strokekilla1987]

hey guys i have a 392 cub motor for my shee.. can i put a 4mil crank in it without changing the ports, can it even be done without changing the cyls?

thanks

 

is the 392 ported

[bbcmudtruck]

I don't think you can run a 4mil crank with a 392. You will have to buy 421 cylinders.

 

 

[4strokekilla1987]

I don't think you can run a 4mil crank with a 392. You will have to buy 421 cylinders.

 

 

not true i run a 5mil shortrod in mine

[Wheelman Chassis]

just a clean up port on the 392, so if i run a short rod on the 4 mil i can stay with the same cyl?

[sleeper06]

I know they make one for a 40 over blaster piston but I think its a 398,In my opinion the durations of the port are to large for the added stroke,last time I degreed one it was on the high end.You would also need to cut the domes if the piston comes through the deck

[Wheelman Chassis]

ok with that being said, say i get the 392 ported and switch to meth.how much would i be giving up to the cleanup port cub 4mil?

[sleeper06]

A drag ported stock stroke cub will tear ass,there is just more capability in the 421 set up,hp will lower along with the torque curve

[RadarRacing]

Can it be done. Yes. But you'd take a 392 which has port durations of 194/130 and end up with 198/136 which isn't really what you'd want for transfer duration. It could be lowered but you can easily sell the 392 cyl add a few hundred for a new cyl and it would be a lot better running motor. IMO. Nate Mccoy and Dan Hull can build those 392s into little monsters get it ported and a set of their domes and it'll rock.