Before Tom got on the dyno I proposed a bet that the 292 would not match the 4200 on power and torque...

Well we're both 1/2 right..

Bone stock 2006 4200 - 277ft/lbs and 291HP - mind you this is in full emmission trim and with the stock exhaust system. So not quite apples to apples.

I know I pickup 23 HP and 15 ft/lbs going to open exhaust during my 4200 engine dyno session earlier this year.


Lets see a good 2006 4200 can be had for about $1000-1500....

On another note the 4200 won't last for ever GM canned production 1 year ago.. Time to start stocking these away.

The early 235-261 are getting hard to find, bet the 230/292 are not far behind. I've only seen 2 292 in the past 5 years show up at the wreckers. Tom can tell you where one of then is....

I guess my point is the 4200 is most likley the future of the GM 6 as early engines disappear.


Last edited by efi-diy; 12/07/09 08:13 PM.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them