Engine Swap Compatibility

chevrolet

#1

I’m considering the purchase of a 1961 Chevy C-10 Apache pickup truck with a 235 c.i. “Stovebolt” 6-cylinder engine and a “3-on-the-tree” manual transmission. I would like to put a bigger I-6 engine in sometime down the road, and I wanted to know whether or not a 292 c.i. straight-6 would be a direct bolt-in replacement, or should I try for a 261 c.i. six instead?


#2

Right up my line. I say stick with the 235 but bore it and put a hydraulic cam in it. These blocks will take a .090 over bore. I built one of these 235’s and could run away from 292’s quite easily. The weak spot on the 235 is the head, they will crack.

The best swap I made was getting rid of the 305 V-6 in my '65 GMC and putting a 330hp small block with a built Turbo 350 in it. That was a sweet running combo and managed to allow me to aquire my last speeding ticket.

If you make a swap,go small block. If you stay with the 6, you can pump the 235 up a good bit.Then again it all depends on what you can get and at what cost.


#3

Clifford performance parts has been in business for decades, specializes in 6-cyl engines. I would also either modify what you have, or swap in a small block v8 if that’s not enough.

http://www.cliffordperformance.net/Merchant2/merchant.mvc?


#4

I like that you built a 235 that could walk away from a 292, sounds great! However, I’ll elaborate on my previous question. I know that the '61 Chevy Apache half-tons came with either a 235 or a 283 V-8, and I believe some of the 4x4 K10’s could be had with a 261 I-6; that being said, I was thinking that instead of a V-8 I could put a larger 6 in this particular truck and get some decent gas mileage, while still having some very respectable stump-pulling low end torque. I’m not really looking for a hot performer, but rather something that looks good and yet can still be used as a work truck at times. I do think it would be a neat trick to see a 50-year-old Chevy Apache workhorse kick some sand in the grille of a new Toyota Tundra, but I’m not really looking to do that. A good, solid, reliable stock-appearing truck that can work with some of the best would suit me. I’ll probably want to lift the suspension a few inches and put some slightly oversize all-terrain tires on it too. What do you think?


#5

The engine won’t make that much difference for gas mileage. Put a V8 in it and gear it for fuel economy.


#6

The bad deal with that Chevy truck is the rear suspension design. My GMC had full leaf springs but I think you Chevy has those long arms connected to the rear end.


#7

That Apache has collector value…I would leave it stock…Out in New Mexico, on the Apache Reservation, they bring SERIOUS money…They have become a HUGE status symbol…

The fancy models with two-tone paint and the wrap-around back-light, name your price…