81 K5 "Arctic Blaze" H.O. 5.3 / SM465 swap

[whitels1]

At this point the wiring is completed in the engine bay, all that is left is to loom it up an run the wiring to the gas tank for the pump and tank pressure sensor, as I'm planning to use the evap purge to control my tank venting, I'm still not sure if I'm going to run an f-body evap canister yet but well I will see when I get there. I have modified the stock tank to accept an in tank pump from a 03 3500 truck, it fits perfect. Here it is mocked up with a 99 F-body pump assy. The tank ring kit was from vette works, boil / clean the tank, cut the old ring out to size tack on 4 corners and seal it.













Finally on to the motor, which is what was has been holding up my swap process, When I started the I had a complete minus heads 00 LS1 from an F-body, but after pulling it apart and inspecting the block it was no good, and turned into my mock up block.


So I was monitoring craigslist for a motor and found a complete 4.8, it had a spun bearing, and a chewed up cam, but the block was solid.








Interestingly enough, both of these motors had fram filters on them when I got them.....

[74 shortbed 406]

I have been wanting to swap in the same combo into my 78, but I am wanting the lq9 engine. Was curious on what was needed for it to bolt to the sm465.

[whitels1]

Originally Posted by 74 shortbed 406

I have been wanting to swap in the same combo into my 78, but I am wanting the lq9 engine. Was curious on what was needed for it to bolt to the sm465.

Running a SM465 with a Gen3 is basically the same, there is only a few differences. 1st is flywheel I will be using a NFW1050 $55 bucks at o'reilly is it deeper and makes up the .4 offset and will mount to a standard 11-7/8 clutch. 2nd an LS7 pilot bearing P/N 12557583 to properly support the input shaft because of the .4 difference in spacing between the block and crank. 3rd 5qty M10x1.5x40 bolts to hold the bell housing to the block. Additionally I have a full write up of the SM465 swap attached to the old 350 on my blog http://morecoffee.me/index.php?view=bulletin&blog=74 It pretty much covers it all.