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Forum: 70-72 GTO Tempest & LeMans TECH 03-11-2023, 01:10 PM
Replies: 251
Views: 23,416
Posted By unruhjonny
if you assume that the number indicates...

if you assume that the number indicates advertised intake duration, as companies have done in the past, it’s probably a 243 duration cam

EDIT:

This might be a good link for starters:

Crane...
Forum: 70-72 GTO Tempest & LeMans TECH 03-05-2023, 11:56 AM
Replies: 251
Views: 23,416
Posted By unruhjonny
/\ except the Olds motor made less power, and was...

/\ except the Olds motor made less power, and was only available in one platform.

I absolutely agree that it was a cool motor, and a real curve ball considering what Olds was doing at the time,...
Forum: 70-72 GTO Tempest & LeMans TECH 03-05-2023, 02:03 AM
Replies: 251
Views: 23,416
Posted By unruhjonny
I agree with these guys, but we also all have...

I agree with these guys, but we also all have individual opinions.

If this was a halo car (RA, 455HO, SD455) then the numbers engine would be a much bigger factor, but lets be honest for a second;...
Forum: 70-72 GTO Tempest & LeMans TECH 02-19-2023, 05:51 PM
Replies: 251
Views: 23,416
Posted By unruhjonny
well, it looks like (from the third attached...

well, it looks like (from the third attached picture) that the primered door will need repairs to the backing structure like yours;
since it’s loose, you could look inside to see if more rot is...
Forum: 70-72 GTO Tempest & LeMans TECH 02-17-2023, 02:07 PM
Replies: 251
Views: 23,416
Posted By unruhjonny
Yes. my notes suggest the following: (IIRC...

Yes.

my notes suggest the following:
(IIRC this was from a combination of personal observations and info gleaned from the internet)
HM = 1973-1976.5
HW = 1976-1978(?)
HF = 1979(?)

The 15x7"...
Forum: 70-72 GTO Tempest & LeMans TECH 02-16-2023, 09:22 PM
Replies: 251
Views: 23,416
Posted By unruhjonny
good catch on the 14” wheel codes guys; I took...

good catch on the 14” wheel codes guys;
I took the post at face value, and only looked at the 15x7” Rally II codes I had here on my phone;
it hadn’t “clicked” that KS was a 14” wheel code - and I...
Forum: 70-72 GTO Tempest & LeMans TECH 02-16-2023, 08:06 PM
Replies: 251
Views: 23,416
Posted By unruhjonny
I would not expect it to make a dent in the...

I would not expect it to make a dent in the value.

I have not observed any physical difference for any of the 1973 & newer Rally II wheels - other than getting on your knees (and possibly removing...
Forum: 70-72 GTO Tempest & LeMans TECH 02-06-2023, 12:09 PM
Replies: 251
Views: 23,416
Posted By unruhjonny
if done properly, I doubt it would affect the...

if done properly, I doubt it would affect the value.

From the few first hand accounts I received from people who ran the Muncie three speed, they all suggested that it seemed to be gear perfectly,...
Forum: 70-72 GTO Tempest & LeMans TECH 02-06-2023, 12:56 AM
Replies: 251
Views: 23,416
Posted By unruhjonny
The 69-74 Muncie three speed only had two ratios:...

The 69-74 Muncie three speed only had two ratios:
The ‘car’ or “B” ratio: 2.42/1.58/1.00
The ‘truck’ or “A” ratio: 3.03/1.75/1.00
I believe that GM’s designation for this transmission was an...
Forum: 70-72 GTO Tempest & LeMans TECH 02-05-2023, 01:28 AM
Replies: 251
Views: 23,416
Posted By unruhjonny
correct, if the option page does not list it,...

correct, if the option page does not list it, then it had standard equipment.
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