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The injection pumps were POSs. Oddly enough it was almost the same injection pump (Roosa Master) Deere was putting in a number of ag tractors powered by six cylinders and they worked well, but I was the unfortunate owner of an '81 Caprice with that 5.7 T-U-R-D. The injection pump failed twice in a year and a half. Starters for those cost about four times what a gas engine starter cost back then. Ask me how I know.

In no particular order.

300 Ford 6

Toy 22R

"Maybe" more durable, 258 AMC/IH I6

The small outside dimension, versatile, durable & longest running engine format ever, small block Chevy. 45 years.

Surprised it was mentioned, but I've seen 100k H/D Evos. 100K, nothing for a modern engine they say, but it's a lot for a 2 cyl. air cooled unit, a lot.

I'm not a luddite, but my wares might indicate otherwise as I have a last year Small block Chevy & a last year H/D Evo.

The Oldsmobile 403 has a fantastic (over square) Bore & stroke ratio for performance... 4.351 bore, 3.385 stroke... but the blocks and cranks were weaker than schit (typical GM stunt)... i've got one in my 79 Trans am, i upgraded to a nodular "N" crank, main studs and straps and a big oil pump... ported W-31 heads, Hi-rise intake, headers & hot cam... makes 425 ft lbs @ the rear wheels... mid range is fantastic, wants to rev like a 302, Wails like a Banshee... but every time the tach gets above 5500 RPM i get a qweezy feeling in my stomach... it's holding up so far... lol

302 Chevy... 4" bore 3" stroke.... 8000 rpm baby

ironbender;
Good evening my cyber friend, I hope that this fine Friday finds you and your wonderful family well.

While I'm cognizant that the initial video and many of the respondents - not all mind you - are answering with performance in mind, I'll go with longevity and putting bugger all in for maintenance.

The mines in the Yukon would run the old 12 Valve 5.9 engines on their gensets, so it'd be running up against the governor in between shutting it down for service and then back up balls to the wall. They ran for next to forever so I hear.

We had 250 I6 from a Canadian Pontiac car - a '71 - that powered a grain conveyor on the farm. So it'd go from dead cold to flat out, run for about a half hour, then off for a couple hours in -40°, rinse and repeat. Again, it just would not die... We didn't really like it either somehow, but it would not die.

The 300 I6 from the mid '80's when they went fuel injected would go for a long time, then needed the timing chain replaced and they'd go again for longer.

As mentioned too the 22R Toyota with the early EFI is very well thought of by the local 4x4 builders here.

All the best to you all this Christmas Season ironbender.

Dwayne

IIRC, if the hood scoop decal on a Trans Am said "6.6 L," it had the Olds engine and if the decal on the scoop said "6.6 T/A," it had a Pontiac 400 in it. Am I right?? Just want to stress my memory a bit.

I had a 76 with the Pontiac 400 in it. I drove the everlovin' shit outa that car.

...and the hotrodders did it before Chevy ever did. They were makin' 301s out of 283s long before the Z28 appeared.

it was actually 450 HP... they down rated it for insurance & politics...

indeed brother... My dad was an old drag racer from the 1960's

The 300’s had timing gears. No chain.

For durability

Ferd 300

Jeep 4.0

Yota 22R

GM 3.8 v6


For making HP

454 chev
426 hemi
427 ferd

I think the 78/79 were olds 403 with an auto and the Pontiac 400 with the manual trans.

yes the 403 T/A's said 6.6 Litre on the Shaker, and the optional 200/220 HP W72 Poncho 400's 77-79 got T/A 6.6 decals... the standard 185 HP Poncho 400's in 77/78 had no shaker callouts at all or some may have had 6.6 Litre callouts as well... mine just has 6.6 on it now... i should add a ? mark just to phuqk with people...

fburgtx;
Good evening to you sir.

Thanks kindly for the correction, I was remembering the wrong motor then on the timing chain on that 300.

Too many vehicles over the years and too many repairs - well and I'm getting too old so the memory is increasingly suspect!

Thanks again and all the best this Christmas Season.

Dwayne

Edit to add;
That's the one with sort of plastic timing gears isn't it?

Or am I remembering wrong once more?

Last one was an '87 that we had and something went out on the timing after a whole bunch of miles..

I vote for the Cat 3406B too. K had one in my KW T800 pump truck and I had to actually watch the speedo to keep that thing even close to three speed limit. No need for the splitter with that beast.

So application matters? A Cat 426 hemi....

Some (?) or all of the 1969's had 2.23 intake valves, then 2.19 from then on.

6-71

Yep. Plastic “fiber” timing gear.