"Secret Photos" of the 68 Petty Road Runner at the Daytona 500
- Thread starter odcics2
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j-c-c-62
Well-Known Member
Nice pics.
My takeaway:
1. Single circuit MC, all drums
2. It is very telling to me the front down cage bars appear ( but it might actually be there, unseen) to make no real effort to reach forward of the UCA pivot points, for reasons I suspect I agree with.
3. The Tb's appear to be rather healthy C body's
4. The rear is a 742?
5. The amount of streamlining underbody taken surprises me for that era
6. Rear springs do not appear to be as robust as I would expect, but the individual leaf thickness is an unknown in the pic
7. I suspect that jack point is near COG, and rather impressive that far back.
8. Don't see any telescoping/collapsing features in the engine compartment on the steering column
Thanks for sharing
My takeaway:
1. Single circuit MC, all drums
2. It is very telling to me the front down cage bars appear ( but it might actually be there, unseen) to make no real effort to reach forward of the UCA pivot points, for reasons I suspect I agree with.
3. The Tb's appear to be rather healthy C body's
4. The rear is a 742?
5. The amount of streamlining underbody taken surprises me for that era
6. Rear springs do not appear to be as robust as I would expect, but the individual leaf thickness is an unknown in the pic
7. I suspect that jack point is near COG, and rather impressive that far back.
8. Don't see any telescoping/collapsing features in the engine compartment on the steering column
Thanks for sharing
Last edited:
The idler and pitman arms are quite the thing.
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it looks? like theres 2 sets of springs on each side,along with a lowering block too.
stock set is light color,look on Top of those at the thinner black set?
those u bolt and shackles look like truck pieces too ?
j-c-c-62
Well-Known Member
I don't see double springs, I do see double shocks, which was the norm in the 60's in nascar, as shocks had not yet evolved.
j-c-c-62
Well-Known Member
Is that a mopar transplant solution, or from another make solution?
Runcharger
Well-Known Member
Great shots for sure. Some surprises there for me.
I don't know anything about them
j-c-c-62
Well-Known Member
Any idea what that linkage set-up gained for them? Improved wet sump oil pan?
That 8.75" rear was unexpected, hemi/4 speed, 600? Hp 3500 lbs,500 miles
Strength, over the flimsy stock linkage. All the MoPar stock cars used the 8 3/4, 1.75 straight pinion. Lots of gear choices from 2.76 to 6.13.Any idea what that linkage set-up gained for them? Improved wet sump oil pan?
That 8.75" rear was unexpected, hemi/4 speed, 600? Hp 3500 lbs,500 miles
The 4 speeds used were standard 18 spline.
Drag cars are different animals!
The drivelines get shocked!
j-c-c-62
Well-Known Member
Remember, there were no pit lane speed limits in that era. Every pit stop was essentially a 1? mile drag race.
I also doubt any "soft" gear alloys would not last a high bank full throttle 500 miles so that was not likely an option.
I surmised it was a 742 rear, in that there is evidence of a wide range of ratios for it, that far surpassed the 489 availabilities.
The 489 was released in 68?
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The 742 was used all the way into the 80s when the last MoPar stock cars were running.
Sometimes the gears would fail, but not often.
I was at every Nascar race at MIS from 1970 to 1978.
Sometimes the gears would fail, but not often.
I was at every Nascar race at MIS from 1970 to 1978.
What are those oval tanks under the topside of the fenders?
Not tanks. Just aluminum pieces between the fenders and engine bay bars.
Probably some type of aero usage.
j-c-c-62
Well-Known Member
Rock guards?
Maybe a decoy!
Look here, not under the car!!
dvw
Well-Known Member
Hard to tell in this pic. It appears the adjustable strut rods are threaded on factory upper ball joints mounted into the K frame.
Doug
Doug
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