Yes but its not a drop in and play. the GMC' 6s are 1.5" longer than the Chevy 216, 235 and 261.
Modifications will need to be made to the front or forward crossmember to extend it 1.5" to accept it. The radiator will need to be moved forward to compensate for the fit of the water pump and fan.
If this is a military engine - more than likely the front timing plate with the front mount bolts will need to be installed from your existing motor. There is a list of items to be completed to convert from military to civilian application found here on the site, and Inliners International website. Your flywheel from your existing motor may or may not fit depending on the flywheel bolt pattern. I have done this twice now. .
This will open up a broader discussion as to what you intend? Do you want more power? is your existing motor needing an upgrade and rebuild?
Finding a Chevy 261 will get you very close to the GMC 270 and will not require the modifications, effort, cost and time to convert your GMC. But, its a fun project to do -if you are inclined. Basic tools and a willingness to roll up your sleeves is all that is really required. If I can do it - you can.
Of course you can put it on a pallet and ship it to me? That is always a viable option.
Last edited by tom moore; 01/02/2020 5:03 PM.
