Link to wards site - the power curve is based on the SAE net correction so when compared older engine which were rated SAE gross the difference is ~ 15% lower.

http://wardsauto.com/news-analysis/general-motors-vortec-42l-dohc-i-6

In any case its about 260 lbs/ft @ 2500 rpm. The torque curve is pretty flat from 1500 to 5500. Have a look and judge for your self. This is in full stock emissions trim - once a better exhaust and PCM power tune is installed the engine make more power. The cost of doing this is included in the cost comparison.

Found this for the 292

http://www.chevyc60.com/the_engine_page.htm they claim a stock 292 made 262 lb/ft net @ 2000 rpm.

If anyone has better info - please update.

The cost comparison included the cost of the rear sump oil pan to address the front axle issue.

To adapt the bell housing to the traditional I6 (194-292) bolt pattern the parts are available.

Here is whats needed to do the job:

bell housing adapter plate including 2 long hollow dowel pins $220

Hitachi gear reduction starter - rough cost $175

or a Tilton starter $340

+ starter nose adapter $180

Alternative is to modify the bell housing to add a bump to clear the stock start nose as it protrude past the ring gear.

For an PG/th200/350/400/700 A torque converter spacer (TC) is needed $120 - 140 depending on the trans. This provides support to the TC nose and adds the length needed fill the gap that 3/8" bell housing spacer introduced.

So for an automatic install - this adds $340 if you modify the bellhousing + $540 for the most expensive bolt in starter option.

all the parts to do an automatic transmission conversion are available.


The biggest issue right now is manual transmission flywheels.

There are a number of efforts underway to solve this supply issue.

Last edited by efi-diy; 04/23/16 01:54 PM.