Engine Swap Advice

[meep]

Question. I did a bunch of comparisons a few years back and seemed to find that stroked engines on the same block were more efficient for mpg. It wasn’t the *size* that made the final difference (it’s commonly said that the large motor “works easier” and gets better mileage) but what I was seeing was more that the engines with longer strokes had the mpg advantages (and emissions disadvantages). Instead of just looking at 305, 350, 4.7/8, 5.7… should we (for fun) consider a smaller block modded as a stroker?

 

[ripcord]

Question. I did a bunch of comparisons a few years back and seemed to find that stroked engines on the same block were more efficient for mpg. It wasn’t the *size* that made the final difference (it’s commonly said that the large motor “works easier” and gets better mileage) but what I was seeing was more that the engines with longer strokes had the mpg advantages (and emissions disadvantages). Instead of just looking at 305, 350, 4.7/8, 5.7… should we (for fun) consider a smaller block modded as a stroker?

In an old school V8 powered car, reduced cruise RPM seems to be the most important factor for fuel economy.

 

[wsar10]

Why not just rebuild what you have, the way YOU want it, and add Fuel Injection?

 

[BrendanC]

i have swapped many vehicles with LS’ and Coyotes. an LS swap on a square body chevy is very simple. find a good running 5.3/4l60e pull out, order an amazon harness. make SURE you go drive by cable. it’s just easier. the last C10 i did is a daily driver and gets 17mpg.
walbro 255 pump, -6 AN feed and return, conversion motor mounts, drive shaft and the simple wiring of the C10.

 

[Rmay635703]

Our old 93 1/2 t 2wd (350 v8 Suburban ) was a consistent 20mpg at low highway speeds and arse in city mpg unless you were very careful ,
I don’t think displacement would help improve on the above

 

[meep]

i have swapped many vehicles with LS’ and Coyotes. an LS swap on a square body chevy is very simple. find a good running 5.3/4l60e pull out, order an amazon harness. make SURE you go drive by cable. it’s just easier. the last C10 i did is a daily driver and gets 17mpg.
walbro 255 pump, -6 AN feed and return, conversion motor mounts, drive shaft and the simple wiring of the C10.

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I *love* what you did to this truck. The suspension drop sends it.

 

[BrendanC]

I *love* what you did to this truck. The suspension drop sends it.

isn’t mine, i just do swaps for a side hustle. i’m the electrical/mechanical person and my partner does all the other work

 

[dfarr67]

Without reading all the posts- the Q-jet can be made to run great witha suitable cam and vortec heads, just have to find a good builder. I purchased a couple kits off of Ruggle but I think he is retired now. For all the expense of a swap I don't think the 350 you have id thought through.

 

[lbhsbz]

I want to say 5000 miles a year on it but more realistic would be 2 or 3k.

The amount of money you'll spend on the engine swap will buy you enough fuel to drive that truck for 10+ years with the engine that's in it.

 

[Stiff_clutch]

I say 4.8/5.3 and the aces jackpot standalone system. The self learning is great and runs a 4.8 just fine in a jeep wrangler if this helps any