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Forum: Pontiac - Street 08-09-2022, 12:42 AM
Replies: 12
Views: 635
Posted By SD421
Sun tuned, I have the info posted in my...

Sun tuned, I have the info posted in my signature.

Running 670’s on it now.
9.3 to 1 compression
3.73’s
1966 GTO
Forum: Pontiac - Street 08-08-2022, 07:42 PM
Replies: 12
Views: 635
Posted By SD421
Engine Stroke And Its Affect On Total Timing?

Hi,
Curious to know what the 4Ē stroke of my 421 wants.
Does it prefer 32,34,36 or 38 degrees total timing or does cam design and head material affect it more?
Forum: Suspension TECH 07-28-2022, 02:29 PM
Replies: 2
Views: 462
Posted By SD421
Hop Stop Bars Issue

Hey anyone,
I have HO racing hop stop bars from 1994 in my GTO. The problem I’m now having is that the attaching point on the differential keeps coming loose on me.. The original attachment is one...
Forum: 66-67 GTO Tempest & LeMans TECH 03-23-2021, 08:29 PM
Replies: 4
Views: 761
Posted By SD421
Sorry, yes a pic of the large sail panel fitment...

Sorry, yes a pic of the large sail panel fitment is what I needed.
This is what the guy did (see pics)
Legendary precovered panel and its not fitting correctly.
Forum: 66-67 GTO Tempest & LeMans TECH 03-23-2021, 03:35 PM
Replies: 4
Views: 761
Posted By SD421
Pic of 2nd Design Sail Panel Area

Hi,
The guy doing my headliner is having an issue with the sail panel fitment.
Could someone post a couple of pics including where the panel meets the back glass?
The trim at the bottom is angled...
Forum: 66-67 GTO Tempest & LeMans TECH 03-21-2021, 01:46 AM
Replies: 1
Views: 396
Posted By SD421
Need Pic of Electric Antenna Cable/Wire Route

Hi,
Does anyone have a pic or can tell me how the electric antenna cable and wire runs from the radio to the antenna?
Seem to recall it ran under the aluminum door sill plate?

Thanks,
Don
Forum: 66-67 GTO Tempest & LeMans TECH 03-14-2021, 08:11 PM
Replies: 2
Views: 474
Posted By SD421
You are correct as it should lay as snug to the...

You are correct as it should lay as snug to the pan configuration as possible. I don't think there was an exact spot.
Mine was closer to the center hump but I've seen a few also close to the seat...
Forum: 66-67 GTO Tempest & LeMans TECH 03-14-2021, 12:37 PM
Replies: 2
Views: 474
Posted By SD421
Location of Under Seat Metal Wire Cover

Hi,
Can someone tell me or post a pic of where the metal cover that sits under the rear bottom seat go?
Itís been years since I removed it and the screw holes for locating it was covered with...
Forum: 66-67 GTO Tempest & LeMans TECH 03-14-2021, 12:20 PM
Replies: 5
Views: 1,189
Posted By SD421
Thanks Jeff. Iím currently having the headliner...

Thanks Jeff. Iím currently having the headliner and seats redone .
Forum: 66-67 GTO Tempest & LeMans TECH 01-22-2021, 12:40 PM
Replies: 5
Views: 1,189
Posted By SD421
Thanks Jeff. That solves my issue! Don

Thanks Jeff.
That solves my issue!
Don
Forum: 66-67 GTO Tempest & LeMans TECH 01-22-2021, 02:17 AM
Replies: 5
Views: 1,189
Posted By SD421
Where Do These Two Plastic Trim Pieces Go?

I cannot remember where these two pieces go.
Near the windshield/headliner? Ames Catalog calls them “Front Windshield Upper Inner Lace”
Could someone post some pics please?
Thanks,
Don
Forum: Pontiac - Street 04-03-2020, 03:31 PM
Replies: 36
Views: 3,353
Posted By SD421
I can’t seem to keep the attached pics from...

I can’t seem to keep the attached pics from rotating.
They’re clearer though
Forum: Pontiac - Street 04-03-2020, 01:31 PM
Replies: 36
Views: 3,353
Posted By SD421
Had to go back to find a pic.

Had to go back to find a pic.
Forum: Pontiac - Street 04-01-2020, 07:30 PM
Replies: 36
Views: 3,353
Posted By SD421
My 421 Block Isnít Following The Rule

Hi,
It was pointed out to me that my 421 block doesnít have the straight across machined pad under the cylinder head but is scalloped like the 389.

Itís a 1966 421, YH code, has the transfer lug,...
Forum: Tri-Power Tech 03-17-2020, 09:06 PM
Replies: 113
Views: 44,538
Posted By SD421
Tom, Thank you for posting all of this...

Tom,
Thank you for posting all of this information!
Could these specs help determine the cfm of these Tripowers?
Thanks,
Don
Forum: Pontiac - Street 02-18-2020, 04:05 PM
Replies: 58
Views: 5,714
Posted By SD421
Dick, I remember something in Pete McArthy's...

Dick,
I remember something in Pete McArthy's book about the 428 is really a 426 but that the name 428 sounds better!!
Don
Forum: Interior TECH 02-09-2020, 10:15 PM
Replies: 0
Views: 845
Posted By SD421
Vertical Window Run Question

Hi,
When the hole gets too large and makes the adjusting screw unusable do you just weld it up and re drill it or get another one?
Don
Forum: Tri-Power Tech 01-29-2020, 06:12 PM
Replies: 15
Views: 2,897
Posted By SD421
Jon, since Iím running a manual transmission is...

Jon, since Iím running a manual transmission is depressing the HIC still
something one should do?
Thanks,
Don
Forum: Tri-Power Tech 01-29-2020, 02:45 PM
Replies: 15
Views: 2,897
Posted By SD421
Hot Idle Compensator When Adjusting Idle

Hi,
I have a question that until recently I never really paid much attention to.

In the Pontiac Service Manual it says to depress the Hot Idle Compensator while adjusting the idle.

Now, Ive...
Forum: Tri-Power Tech 01-19-2020, 06:43 PM
Replies: 6
Views: 3,338
Posted By SD421
Dick, I sent you a PM

Dick, I sent you a PM
Forum: Tri-Power Tech 01-17-2020, 06:39 PM
Replies: 86
Views: 11,285
Posted By SD421
Dick, what about the End Carbs? Should they...

Dick, what about the End Carbs?
Should they have holes in the throttle plates too?
Thanks,
Don
Forum: Tri-Power Tech 12-26-2019, 03:39 PM
Replies: 6
Views: 3,338
Posted By SD421
Mixture Screws Over 3 Turns Out

Hi again,
Another question:

So my mixture screws are over 3 turns out and I already opened the Idle Orifices and the Mixture Screw holes up per Mike Wasson's recommendation.

If I want to be 2...
Forum: Tri-Power Tech 12-26-2019, 03:33 PM
Replies: 1
Views: 1,747
Posted By SD421
When A Crack In The Manifold Really Matters

Hi,
How serious is having a couple of cracks where they usually appear on a 1966 tripower manifold?
When do you need to replace the manifold?

Thanks,
Don
Forum: Pontiac Business Entities Exchange 09-23-2019, 09:09 PM
Replies: 8
Views: 3,779
Posted By SD421
Paul ďgtofreekĒ Huge Asset To The Communty

Hey all,
I had some questions recently and called Paul “gtofreek” to discuss.
He is a huge asset to our Pontiac community.
Thanks again Paul!!
Don
Forum: Pontiac - Street 04-07-2018, 04:13 PM
Replies: 10
Views: 505
Posted By SD421
This is the book I used. Plus I bought gears and...

This is the book I used. Plus I bought gears and rebuilt kit from Paul as well.

How to Rebuild & Modify High-Performance Manual Transmissions (Workbench Series)...
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