Photo of 68 Camaro's at Kenny Ross Chevrolet ?

[JoeC]

Not many 1967 or 1968 TH400 427 Yenkos have been found so hard to say how they were built.

In 1967 Yenko ads show the 427 TH400 car as 410hp with hydraulic lifters.
In 1967 Yenko converted SS396 325HP TH400 cars to 427
It is not clear how the engines were equipped
They could have used a 390hp L36 short block or long block and called it 410hp.
Not sure if they used the Q-jet or changed out the intake and carb for a Holley

In 1968 Yenko ad shows 427 425hp TH400 cars.
Most likely converted from an SS396 325hp TH400 but it is not clear if they used hydraulic lifter or solid , oval port heads or square port heads , Q-jet or Holley, to get the 425hp.
It would be a stretch to use a L36 390hp and call it 425hp

I have not heard of any SS396 325hp TH400 Camaros with the COPO 9737

[Kurt S]

I think the gold cars were all L35 autos, non-COPO (since the COPO included the MV block). That means that there were several errors in the ad about 9737 components on the cars. Not surprising because it was complicated.
Interesting they didn't spread the autos into different colors.

I was always curious how they 'detuned' the 25 hp. Did they work over the TH400 trans or was it stock?

1-1/16" sway bars - any found in 68 Yenkos? I didn't think they were that large.

[enio45]

Kurt, they had the big sway bars....mine and tom billions car had then and of course other 68 yenko cars as well.

They are HUGH !!!!!

[Charley Lillard]

I thought 9737 was a 13/16" sway bar ?

[JoeC]

1969 9737 COPO Camaros had a 13/16 bar

1968 9737 COPO Camaros had a 1 1/16 bar by most accounts but some still say they had a 1in dia. bar. I wonder if they used both for some reason.

Chevy made a bunch of bars available as Special Equipment for road racing.
They were available from about 3/4 in. to 1 1/16 in. to tune the suspension to different tracks run in SCCA. Also made a rear bar.

Don was said to be very good with sway bars and springs from many years of SCCA racing

[bkhpah]

The front sway bar on 68' Yenkos was 1 1/16. There is different hardware that hold the bar to the frame and two additional frame brackets located inside the frame to support the bar..

[firstgenaddict]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bkhpah</div><div class="ubbcode-body">The front sway bar on 68' Yenkos was 1 1/16. There is different hardware that hold the bar to the frame and two additional frame brackets located inside the frame to support the bar..

</div></div>

The braces look like the ones for the Trans Am sway bar kits available from Chevrolet during the period. Much listed about them in the Trans Am forums on the CRG site.

[cook_dw]

In my experiences with running and using chassis dynos the drivetrain loss from a manual which pretty typical of 15% and an auto is %20 so the 6% (give or take) difference between the 450 to 425hp flywheel hp listing in the ad would make one assume it was a solid lifter L72 type of engine with a TH400.. I would think that Yenko would toss one of the auto cars on the dyno just to see what the drivetrain loss would have been.. Remember this was the very early stages of auto trans being able to handle the power and shift almost as fast as someone in a manual and it be consistent on the shifts..

That's my worthless $0.02


As for the sway bar does any know why the change to the larger bar was done.?. Most of these cars were built for straight line not the SCCA.?.

[Kurt S]

Thanks for the info on the 68 swaybars. That thing looks like a 69 ps drag link!

[bkhpah]

I knew you would appreciate the info Kurt..BKH