Originally Posted By: limequat
 Originally Posted By: Whitedog
My original plans for my 'bolt were to find a 261, or dual carb and split the exhaust on my '59 235. The more I think about it, the 4200 is probably the way to go and I would be much more satisfied with the end result. Finding a wrecked TB and stripping the drivetrain may even be cheaper than rebuilding a 50+ year old drivetrain and trying to squeeze a few extra ponies out of it.


Oh, I definitely agree that the 4200 is the better value proposition. I got my 2006 -complete with all accessories, pcm, and wiring- for $850.


X2 - with a good tune, and a decent exhaust your not far off 300HP crank.

In my '51 I stated with a well built 292, - made about 200HP, but drank gas like no tomorrow. Changed to a bone stock '05 4200 motor and picked up 10 MPG highway. No other changes to the truck.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them