Some Big Block help please.

[Craig Nedrow]

Did what you want to do reciently, go here:
https://www.gmsquarebody.com/threads/1973-k20-350-to-454-swap.29840/
Listed lost of part # details, what can be used from the 350 and etc. Hope this helpes.

 

[Mark Jones]

Ya, I was going to say 12valve ftw.
it wins the “less wires” to hook up and The most Easy power For towing and pro use all in one.
1 wire and 700-800 ft-lbs without even taking the valve cover off!

For gas towing and pto gotta keep the 4 speed, but a 70s RV with a 454 and turbo 475 trans is hard to beat for simple tough setup.

'turbo 475 trans is hard to beat'

YES

 

[wanderinthru]

Thanks fellers!! That is alot of information to get thru and "figure out". Been a busy as a cat on concrete so it may take me a minute to digest all this.

 

[dsteelejr]

In what I have been able to assertain seems a 427, with the correct cam and compression may be more ideal than a 454? Any and all thought, experience etc.. is appreciated.

A tall deck 366 or 427 are ideal for heavy load applications. I considered replacing my 454 with either one, but went with another 454 because of the core.

The tall deck engines are not fast, but they were designed as heavy duty gas engines specifically designed for sustained heavy duty loads.

The deck height (the block) is 10.2 inches, compared to 9.8 inches on the standard big blocks like the 454. The reason for this was GM put taller pistons in it, which had an extra compression ring. Three compression rings and one oil ring. The taller piston accommodated this without changing the rod length or stroke. This also puts the heads further apart so it has a wider intake manifold. Fine if you use the stock manifold, but aftermarket ones are next to nonexistent. They also have a superior cooling capacity than the 454, using two thermostats.

For tall deck engine info check out
https://www.tradecraftspecialties.com/bbckb


366/427 versus 454
https://www.tradecraftspecialties.com/bbckb#Topic12


Why bother with a 366?
https://www.tradecraftspecialties.com/bbckb#Topic7

 

[wanderinthru]

A tall deck 366 or 427 are ideal for heavy load applications. I considered replacing my 454 with either one, but went with another 454 because of the core.

The tall deck engines are not fast, but they were designed as heavy duty gas engines specifically designed for sustained heavy duty loads.

The deck height (the block) is 10.2 inches, compared to 9.8 inches on the standard big blocks like the 454. The reason for this was GM put taller pistons in it, which had an extra compression ring. Three compression rings and one oil ring. The taller piston accommodated this without changing the rod length or stroke. This also puts the heads further apart so it has a wider intake manifold. Fine if you use the stock manifold, but aftermarket ones are next to nonexistent. They also have a superior cooling capacity than the 454, using two thermostats.

For tall deck engine info check out
https://www.tradecraftspecialties.com/bbckb


366/427 versus 454
https://www.tradecraftspecialties.com/bbckb#Topic12


Why bother with a 366?
https://www.tradecraftspecialties.com/bbckb#Topic7

Thanks, very educational for me!! I had no idea the 366/427 had a higher deck height than a 454... actually wasn't certian what deck height is. As I've been mulling this over, looking for C 60 ish, bob tail grain trucks for the engine. It makes more sense to find a c60 take the bed and hoist off (prob mount on a goose neck trailer and sell??) Build a nice bed, Mount the winch I have on it as well as welding rig etc... and just use it as a haul, work truck. Can see alot of advantages, more hauling area on the bed, more convient bed height to work off of, table top, with out looking all janky, bigger truck with better braking ability, more under bed area for compressed air tank, hydraulic controls, storage boxs etc... Get it put together, that frees up the 75 to fix up and make another neat old work truck out of?? Plus, an old C 60 all dolled up and rigged out would be pretty cool!
Thanks again!!