For the last two years, I've been slowly collecting parts to get my K5 back on the road. I had purchased a built 406 SBC, with forged internals and also purchased some nice AFR heads to go with it along with roller cam, MPFI, etc. Before installing it, I decided to take it by my local machine shop and have them inspect it. Unfortunately, I got bad news today from my machine shop and was told one of the steam holes had cracked into the cylinder wall from the previous owner. I have no recourse going back to the guy since it was well over a year ago when I bought it. So now I'm looking at buying a new Dart Little M block...
I thought about buying another used GM block but after you spend the money to machine the splayed main caps, and other services, price is fairly close to a new Dart block. With estimated 500+ at the crank, and possible forced induction in the future, it makes more sense to upgrade to a stronger block.
For a good a laugh, I went through all the engines I have gone through for the K5-
K5 Engine History-
350 ci- Stock, not enough power
383 ci- Lost bearings and crank due to oil pump pickup not welded to pump
454 ci- Used. Lost main bearings due to improper clean and build
454 ci- New. Not enough power due to crappy peanut port heads
496 ci- Spun rod bearings, lost crank due to bad machine work
540 ci- Never installed- sold due to finances
496 ci- Used, never installed. Change mind for 406 SBC
406 ci- Used, never installed. Found crack in GM block
406 ci- New Dart Block ordered. Will use rotating assembly from engine above
Wondering if I hold the record on most engines for one K5!
I thought about buying another used GM block but after you spend the money to machine the splayed main caps, and other services, price is fairly close to a new Dart block. With estimated 500+ at the crank, and possible forced induction in the future, it makes more sense to upgrade to a stronger block.For a good a laugh, I went through all the engines I have gone through for the K5-
K5 Engine History-
350 ci- Stock, not enough power
383 ci- Lost bearings and crank due to oil pump pickup not welded to pump
454 ci- Used. Lost main bearings due to improper clean and build
454 ci- New. Not enough power due to crappy peanut port heads
496 ci- Spun rod bearings, lost crank due to bad machine work
540 ci- Never installed- sold due to finances
496 ci- Used, never installed. Change mind for 406 SBC
406 ci- Used, never installed. Found crack in GM block
406 ci- New Dart Block ordered. Will use rotating assembly from engine above
Wondering if I hold the record on most engines for one K5!



Sucks! Funny how I can push 730whp with a turbo 4 banger, abuse the crap out of it and not have a single issue!


