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Forum: 68-69 GTO Tempest & LeMans TECH 07-14-2026, 06:09 PM
Replies: 15
Views: 249
Posted By SD455DJ
...I'm at a loss for words... Dennis

...I'm at a loss for words...

Dennis
Forum: Pontiac - Street 07-13-2026, 07:17 PM
Replies: 32
Views: 6,359
Posted By SD455DJ
Here is the dyno session on a '78 W72 400 with...

Here is the dyno session on a '78 W72 400 with the Summit 2800 cam...

Dan had a good dyno session today with the W72 400. He rebuilt the original numbers matching engine with .040" over Icon...
Forum: 67-92 Firebirds & Trans Ams WANTED 07-13-2026, 06:50 PM
Replies: 65
Views: 20,479
Posted By SD455DJ
Thanks! If only it was a '78! Weird that it...

Thanks! If only it was a '78!

Weird that it was ordered with the vacuum gauge instead of the tach with the W72 400!

Dennis
Forum: 71-77 Ventura including 74 GTO TECH 07-09-2026, 02:55 PM
Replies: 20
Views: 3,560
Posted By SD455DJ
I'm sure the double chamfer in the '70 350 blocks...

I'm sure the double chamfer in the '70 350 blocks didn't help the compression any, except lower it a bit. 7.9 to 8.0 is probably right on.

Dennis
Forum: 71-77 Ventura including 74 GTO TECH 07-08-2026, 07:38 PM
Replies: 20
Views: 3,560
Posted By SD455DJ
I should have mentioned that you rotate the...

I should have mentioned that you rotate the engine so both lifters to the cylinder you're testing are on the base circle (compression stroke). It is a resonance difference between the two extremes....
Forum: 71-77 Ventura including 74 GTO TECH 07-08-2026, 06:43 PM
Replies: 20
Views: 3,560
Posted By SD455DJ
The Katech Whistler is an electronic device that...

The Katech Whistler is an electronic device that accurately measures an engine’s compression ratio without disassembling the engine.

The Whistler Compression Ratio Tester is designed to determine...
Forum: 71-77 Ventura including 74 GTO TECH 07-08-2026, 10:04 AM
Replies: 20
Views: 3,560
Posted By SD455DJ
This conversation has got me curious… For...

This conversation has got me curious…

For the 350 (354) and 400 engines with #11 heads to have the same advertised compression ratio of 8.80 to 1, the 350 heads would need to measure 77.2 cc’s and...
Forum: Pontiac - Street 07-08-2026, 07:33 AM
Replies: 416
Views: 82,495
Posted By SD455DJ
I hear ya...It's challenging to get the entirety...

I hear ya...It's challenging to get the entirety of the swap meet in, let alone watch some racing along with the demands of the car show work we are committed to, then maybe, quickly look at the cars...
Forum: THE LOBBY 07-08-2026, 07:23 AM
Replies: 16
Views: 456
Posted By SD455DJ
Maybe with a 301T block with aluminum heads &...

Maybe with a 301T block with aluminum heads & intake with tube headers to keep the weight to a minimum would work...and a custom 9" IRS rear.

Dennis
Forum: Pontiac - Street 07-07-2026, 06:56 PM
Replies: 416
Views: 82,495
Posted By SD455DJ
Absolutely amazing Mike! I'm the guy the helps...

Absolutely amazing Mike! I'm the guy the helps 'park' the Firebirds for the show, so I'm bummed I won't see you and the car on Saturday. Dan is one of the show car tech guys at the front of the line....
Forum: 61-77 GTO, Tempest & LeMans Parts WANTED 07-07-2026, 09:25 AM
Replies: 3
Views: 1,011
Posted By SD455DJ
Any white/ivory 2-dr hardtop interior driver door...

Any white/ivory 2-dr hardtop interior driver door panels out there in PY land? It is needed for my GT-37, but it's a driver quality refurbishment, not a concours restoration, so I'd be interested in...
Forum: 61-77 GTO, Tempest & LeMans Parts WANTED 07-06-2026, 07:53 AM
Replies: 2
Views: 142
Posted By SD455DJ
Barry Martin at Sonic Motors used to repop them....

Barry Martin at Sonic Motors used to repop them. Check with him to see if he still has them. I bought one for my '71 455HO Formula and it worked/looked great.

Dennis
Forum: Pontiac - Street 07-05-2026, 06:54 PM
Replies: 51
Views: 1,611
Posted By SD455DJ
Quote: "I believe Cars magazine had a road test...

Quote: "I believe Cars magazine had a road test of a ’72 lemans GT with the L78 400, M-20 4-speed trans and a 3.55 Safety Track rear end and they got it down to 14.40’s at 99 mph in quarter mile...
Forum: 70-72 GTO Tempest & LeMans TECH 07-04-2026, 06:28 PM
Replies: 393
Views: 97,365
Posted By SD455DJ
Me too Mike...lol! Actually, it's been 11 1/2...

Me too Mike...lol! Actually, it's been 11 1/2 years since it came to Michigan...geesh! Tim, the body & paint man, is working slowly on the body work as it's been too hot up here lately. This is a...
Forum: Pontiac - Street 07-03-2026, 04:45 PM
Replies: 9
Views: 537
Posted By SD455DJ
Actually, the vacuum source is from the nipple...

Actually, the vacuum source is from the nipple screwed into the no. 1 intake manifold runner, not the vacuum tree behind the carb...thanks to Kenth's diagrams!

Dennis
Forum: Pontiac - Street 07-02-2026, 01:17 PM
Replies: 9
Views: 537
Posted By SD455DJ
The way I understand the RA heat riser function...

The way I understand the RA heat riser function is the flapper doors on the hood mounted pan have rubber vacuum lines that run to a common ‘T’. From there the single rubber vacuum line runs to one of...
Forum: 67-92 Firebirds & Trans Ams WANTED 07-01-2026, 06:17 AM
Replies: 65
Views: 20,479
Posted By SD455DJ
There have been a few since we allowed these cars...

There have been a few since we allowed these cars to race several years ago. I'd say at least 4 - '78/'79 W72 4-speed TA's, 1 - 403 '79 TA, and 4 - Z28's so far...as I recall.

According to Rocky's...
Forum: 67-92 Firebirds & Trans Ams WANTED 06-30-2026, 12:02 PM
Replies: 65
Views: 20,479
Posted By SD455DJ
I want an automatic W72 Formula for the pure...

I want an automatic W72 Formula for the pure stock drags...plus the fact that you just don't see them. The 4-speed cars seem to have a higher survival rate since they are more desirable to the...
Forum: 67-92 Firebirds & Trans Ams WANTED 06-29-2026, 07:22 AM
Replies: 65
Views: 20,479
Posted By SD455DJ
Thanks Tcom! Unfortunately, the '77 W72 400's...

Thanks Tcom! Unfortunately, the '77 W72 400's still utilized the lightened '557' block...to bad it wasn't a '78.

Dennis
Forum: 70-73 Firebird & TA TECH 06-26-2026, 03:10 PM
Replies: 6
Views: 569
Posted By SD455DJ
Any pictures to share? Dennis

Any pictures to share?

Dennis
Forum: 70-72 GTO Tempest & LeMans TECH 06-26-2026, 03:09 PM
Replies: 7
Views: 765
Posted By SD455DJ
I have a '71 GT-37 that was ordered with 14x7...

I have a '71 GT-37 that was ordered with 14x7 Honeys and it has the original 14x7 Honey spare in the standard location. It is the same location on the right side for all wheel types (standard, Rally...
Forum: Pontiac - Street 06-25-2026, 05:05 PM
Replies: 51
Views: 1,611
Posted By SD455DJ
The 250 net horsepower rating for the ’71 & ’72...

The 250 net horsepower rating for the ’71 & ’72 400 4-bbl is fairly accurate as installed in the vehicle after taking into account losses from internal frictions of the transmission and rearend,...
Forum: 70-72 GTO Tempest & LeMans TECH 06-25-2026, 01:21 PM
Replies: 5
Views: 992
Posted By SD455DJ
Should be 9799124 for all V8's. Dennis

Should be 9799124 for all V8's.

Dennis
Forum: 70-73 Firebird & TA TECH 06-25-2026, 01:16 PM
Replies: 6
Views: 569
Posted By SD455DJ
I would tend to agree with this statement. ...

I would tend to agree with this statement.

Dennis
Forum: 70-73 Firebird & TA TECH 06-25-2026, 01:14 PM
Replies: 6
Views: 569
Posted By SD455DJ
Very cool Formula 455HO Boardog! According to...

Very cool Formula 455HO Boardog! According to Fred Simmonds there were 321 455HO Formula's produced in 1971. Of this number 109 were ordered with Ram Air (I'm not sure where these numbers came from,...
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