There is a GM marking stamped on the upper intake manifold. I also do know that it is a 4 barrel Rochester carberator and on the the top of the outdrive where my oil fill screw is located there is another nameplare that says "OMC 5.7L". Thats the only reason I say its a 5.7
I have a 79' 5.7 OMC with Model #983816 and Serial# J352479. Im trying to order some parts and a service manual but when i put these numbers in, Im struggling trying to find info. Am i missing something? The numbers came off an ID tag on the side of the outdrive. I couldnt seem to find any other...