To BixSix302.....
My truck had originally a 216... and they bolted a 248 GMC to the original bellhousing.... using what seems to be the original flywheel and 9 inch clutch. Can I assume that a 270 would also bolt on the bellhousing????
I am now committed to rebuilding a 261 1958 ex fuel delifery 3 ton truck.... which bolts on the old 216 bellhousing.... and will be using the 10 inch flywheel clutch of the '58 and the original 1940 4 speed crash box... no synchros...yikes!!!.
I have saved the 248 for a future project.
My 261 will have the central, one only, motor mount bolted to the bottom plate at the front of the engine... actually got mine from another donor 235..... I am also using 235 heads after many recommendations that is was a better mix on the 261...as long as you remember to drill out the steam hole...... it will take me from an original 82bhp to a whooooping 145bhp....
Top speed with the original 216 and 16 inch wheels with 6:39 axles was about 45mph.... I am hoping for at least fifty with the 261...going down hill.... hoping the brakes will hold up...
Would love to do another one using a big 270 or better still a 302 but would expect crank to flywheel incompatibility problems....not to mention the overall lenght of the GMC block.
Sure appreciate all the info and help I have gathered over many hours of reading the Forum.
Bob Carriere
