SO here it goes not new to boating just new to ownership of a 1969 mark twain I know all about the history of the maker and the forum for these boats I have a stupid question that I need all the ears possible to help me... It has a model 1 out-drive on it and came with a 120 hp motor the previous owner says the motor was swapped he thought the 140. Interesting part is the valve cover has no identifiable marks and I have literally no idea what motor is in there.
I know the serial numbers don't match on block of motor and hull tag so motor is not original that I know and I have a full garage stall of spare engines parts from bell housing to engine couples to manifolds and carbs.
I have three carbs and three manifolds two manifolds are the same and have 6 bolts to hold it on, two bolts being on the outside edges of the flange and one has 4 bolt holes none on the very outside of the flanges and is cast iron the others are aluminum. They are all 2 jet Rochesters with auto choke.
That being said I know if I take the head off I'll know right away but is there a way using serial numbers to identify motor and head I have engine number and head as well I think.
I don't want to just go off looks because supposedly the 120 exhaust would need to be put on the 140 to make it work with the out-drive is that correct?
I know the serial numbers don't match on block of motor and hull tag so motor is not original that I know and I have a full garage stall of spare engines parts from bell housing to engine couples to manifolds and carbs.
I have three carbs and three manifolds two manifolds are the same and have 6 bolts to hold it on, two bolts being on the outside edges of the flange and one has 4 bolt holes none on the very outside of the flanges and is cast iron the others are aluminum. They are all 2 jet Rochesters with auto choke.
That being said I know if I take the head off I'll know right away but is there a way using serial numbers to identify motor and head I have engine number and head as well I think.
I don't want to just go off looks because supposedly the 120 exhaust would need to be put on the 140 to make it work with the out-drive is that correct?
