1976 merc 400 thunderbolt

[bardzik]

Someone has told me that carbs from a larger motor (dont know what size) will up the hp due to the same block being used. Its a 1976 merc 400EL kifr 40hp super thunderbolt.
ser. 190376. if so, what else has to be done to compensate...prop...time..? motor seems to be slow to begin with.

 

[johnson20]

Re: 1976 merc 400 thunderbolt

50 only has one carb? 50 is a 4 piston where 40 is only 2.

johnson 40-50hp have 2 pistons.

 

[bardzik]

Re: 1976 merc 400 thunderbolt

the 40 i have is 4cyl two carb

 

[johnson20]

Re: 1976 merc 400 thunderbolt

Ok.

Maybe it would work... oem part finder pistons,reeds,block serials and compare to see if theres a difference.