Yes I did. All I got was the 305 v6 and 351 v6 were alike over all. Nothing on bellhousing patterns though.
As far as i know thats it. The 305and the 351 were in gmc only trucks from the 60s to theeirly 70s. My parts 64 gmc had the 305E in it. Hell of a motor for torq but not much for hp. There is a web site for nothing but gmc trucks with them i think its called 60-66gmcguy? I cant remeber for sure. My cab on my truck still has the plate on the inside kick panel saying thats what is saposto be in there. That dont take kindly of poeple taking of replacing them with small blocks!
Ok, After doing more research. I found that a 305/351 V6 is not a universal fit bellhousing pattern like chevy bellhousing used to bolt on the chevy SB/BB engines. I was being that is probably had a SM420 manual trany.
From what I heard GM stopped making them due to they lastest to long and GM was losing money don't know how true that is oh they used a lot of gas as well.
Huh? Emissions was the number one reason, as usual. They kept jumping up in cubes, this one was replaced by an even bigger model. 379 is the one that jumps out at me most, just because I had to change a couple out in old moving vans There were several. Dave, there were quite a few engines in this line. They were a slower speed engine. You will not have fun finding this engine, but here is one I found with a simple google search http://www.nexttruckonline.com/sear...=Engines&make=GM&model=351&listing_id=1238156 If you truly have a 420 trans, ditch this idea and get a small block. Realize the likelihood of actually doing this project. Maybe just sell this behemoth, and obsess over something else?
I'm not sure what tray is in it right now. Its GMC 69 C7500. I know they stop using the sm420 in 67 and 68 was entry year for the sm465 but they only used those up to a 1 1/2 ton trucks. The GVW on this truck is 24,000. I'm more thinking going the 454 route and chevy bellhousing since the 351 V6 is hard to find. The one in that link doesnt say if its a C or M. There's big difference between the two. I have the M version for maganum. Were to selling to it right now as is but not to a scrap dealer. The truck body over all isnt in that bad of shape.
