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Forum: 64-65 GTO Tempest & LeMans TECH 05-23-2024, 12:37 PM
Replies: 7
Views: 1,434
Posted By Dick Boneske
We always aimed for 12 degrees initial and about...

We always aimed for 12 degrees initial and about 34 degrees all in by 2500 rpm. That should work for your 421. If you want better fuel economy, adding vacuum advance will help, but be careful. The...
Forum: 61-66 Big Pontiac TECH 10-28-2022, 03:43 AM
Replies: 3
Views: 1,311
Posted By Kenth
I would say 1963-1965 1/2 #544956 421 H.O. rod. ...

I would say 1963-1965 1/2 #544956 421 H.O. rod.

In general, widths of the big end of the Pontiac rods are .995", and the small ends are 1.250".

Exceptons are
1958-63 S.D., .985" big end....
Forum: 61-66 Big Pontiac TECH 10-28-2022, 03:22 AM
Replies: 3
Views: 1,311
Posted By 242177P
Seeing as how nobody more knowledgeable than me...

Seeing as how nobody more knowledgeable than me (that's a lot of people) has stepped up...

IIRC, all the 58-62 rods were forged. Could these be good ones? Without any way to ID them odds are...
Forum: 64-65 GTO Tempest & LeMans TECH 10-14-2021, 09:13 AM
Replies: 2
Views: 1,168
Posted By Rich-Tripower
For 64-65 I believe the windshields (and thus the...

For 64-65 I believe the windshields (and thus the a-pillars) are all the same. It changed for 66-67 where the hardtops and sedans were slightly different.
Forum: 64-65 GTO Tempest & LeMans TECH 10-13-2021, 10:24 PM
Replies: 2
Views: 1,168
Posted By 242177P
The post car windshields (includes 4 doors and...

The post car windshields (includes 4 doors and wagons?) are shorter by about an inch.
If I'm not mistaken it's because the hardtop windshield is laid back at a slightly more
aerodynamic angle?...
Forum: 64-65 GTO Tempest & LeMans TECH 06-23-2021, 04:41 PM
Replies: 16
Views: 3,477
Posted By padgett
It was the aluminum headers that would drip on...

It was the aluminum headers that would drip on the track.
Forum: 64-65 GTO Tempest & LeMans TECH 06-23-2021, 04:01 PM
Replies: 16
Views: 3,477
Posted By MIAGIMAN
421

My 64 runs a 421 HO for years & years, " no worries" go for it, It's been a track and street car second all its life with no frame issues with plenty of first gear launches! Like B Man said it's...
Forum: 64-65 GTO Tempest & LeMans TECH 06-21-2021, 12:25 PM
Replies: 16
Views: 3,477
Posted By padgett
The magazine test cars in '64 had 421s. Bolt...

The magazine test cars in '64 had 421s. Bolt right in.
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