do a compresion test on your 4 cylinder, if its fair, pull the head, have it gone thru and freshend. Have the machine shop install the rocker arm up grades. try compition cams magnum rockers, they are cheaper than full roller and far better than what you have, you may have to install big block chevy rockers and studs. DO a search for cheap 460 ford rockers, a whole bunch of different ideas came up. Put it all back together with the stock 2bbl set up and try it out. At teh very least, you will have a good motor to sel if you want more power. My old roomate had a 17 Stingray owrider. I did a few minor mods to the 3.7 2bbl motor he had. Teh boat would run 55 mph with alight load. We used to pull two wake boards all teh time with four peopl in the boat. Don't give uyp on that four cylinder, its a good powerful motor. Easier to fix what you have than start a new
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