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Author Topic: Firebird and the Trans-Am series  (Read 41668 times)
tjs44
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« Reply #135 on: March 05, 2014, 11:45:19 AM »

inside X ram
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crazyamc
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« Reply #136 on: March 05, 2014, 01:20:05 PM »

Big applause! I LOVE to see the obscure parts posted! THANK YOU!  I have two questions; the offset on the carbs looks like they go the wrong way, (meaning it seems to me that they're sitting at the ends of the plenums..?   2.  The roof of the opening; was the distribution fixes and the cut away roof cast that way, or was it a 'dyno' mod?  Ken
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tjs44
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« Reply #137 on: March 06, 2014, 10:23:46 AM »

You have to realize the intake port arrangement is more like a BBC than a SBC,meaning no paired ports.To balance the flo they must have had  proof that it was better to have the carbs positioned where they are.I like a tunnel ram myself over a X ram.Pontiac had a factory tunnel ram avail over the counter for their 421 SD program way back in 1962.Tom
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mike343sharpstick
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« Reply #138 on: March 06, 2014, 11:01:36 AM »

I remembered seeing this attached info elsewhere on THIS forum. There is so much information here on misc. TA cars and related engine technology it's incredible.
Note the picture on the upper-left, you can see where they are testing different carb configurations.
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69Z28-RS
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« Reply #139 on: March 06, 2014, 11:14:04 AM »

I didn't know much about Pontiac's '303' engine, so I had to do some digging.  I was curious about the bore/stroke relationship.. and for us 'over square' engine lovers (who love revs), all I can say is WOW... Smiley   Does anyone have an audio clip of this engine at 8-9 grand?? Smiley
Has any factory engine ever had a higher bore/stroke ratio than 4.125/2.84= 1.45 Huh?
"303 specs...


The 303's bore was identical to the 400 at 4.125 inches, but it featured a shorter stroke at 2.84 inches. The 303's short deck took off about 40 lbs. from the 400 V-8 version.  The racing 303 was equipped with four-bolt mains, a forged steel crankshaft, aluminum intake and a high-rpm crankshaft that allowed the engine to rev up to a whopping 8,000 revolutions per minute. Pontiac beefed up the main-bearing webbing to handle the high revs and reinforced the ribbing. The engine was a Ram Air forced induction model with Ram Air V heads and R/A-V cast-iron exhaust manifolds. The compression ratio was set at 10.75-to-1, and with an 800 cfm four-barrel Holley carburetor, it generated up to 525 horsepower. The intended production version, which would satisfy the SCCA homologation rules, would generate 355 horsepower.
"
« Last Edit: March 06, 2014, 12:39:55 PM by 69Z28-RS » Logged

Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
ko-lek-tor
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« Reply #140 on: March 06, 2014, 11:42:27 AM »

Dag Gawn, that's impressive!! I'm with you Gary, I want to hear one of those Indians 8K wail! Like you, I am going to read up on the 303 thanks to this post. Thanks guys and CRG.
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Putting you First...Keeps me First. Talent on loan from God. Helping the hobbyist and exposing the fraud
1969 SS/RS 396 coupe Hugger Orange X22 712 bought in 79
1969 SS 350 coupe LeMans Blue 713 bought in 79
1969 307 4spd. coupe Daytona Yellow 711 bought in 85
Jon Mello
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« Reply #141 on: March 19, 2014, 08:34:02 AM »

I feel like I should be wearing a helmet and cape while posting these. Here are a couple of photos from Mike Scott, aka group/7. They are of a spectator's car in the parking lot at the 1970 Mosport Can-Am. I thought those trunk lid rear wings only came around as a result of the Fast & Furious films but here is the grand daddy of them all. Firebird GT47 rulesGrin
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Jon Mello
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satman
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« Reply #142 on: March 19, 2014, 11:53:07 AM »

I worked for a Canadian GM dealership back in the sixties and trust me there never was a factory built Firebird with a Chev engine but I guess the overworked tech staff decided to let it slide. In my opinion the Firebirds were not that well prepared and needed all the help they could get.

Al Richards
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Jon Mello
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« Reply #143 on: March 20, 2014, 08:42:20 AM »

Al, there was a Firebird made within Pontiac somewhere that did have a Chevy engine installed in it and it was taken up to Terry Godsall's dealership in Canada as a ploy to convince the SCCA people that some Firebirds were equipped with Chevy engines north of the border. I do not think the Chevy engine was installed on the assembly line but I do think some paperwork was created to make the car appear legit. I don't think any of it was truly necessary as SCCA was willing to look the other way just to get Pontiac's involvement.
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Jon Mello
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Jon Mello
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« Reply #144 on: March 21, 2014, 08:41:11 AM »

Here's another picture of a '67 Firebird at the Mosport circuit, courtesy of Mike Scott (group/7). This shot was taken at the
1000K enduro in August 1984. No other known details about it. I don't recall another car trying to take aerodynamics to
that extreme on that style of body back in that era.

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Jon Mello
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« Reply #145 on: March 21, 2014, 07:52:54 PM »

I am glad that trend never caught on, at least over here. Japan has cars like that running around.
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Jon Mello
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« Reply #146 on: March 22, 2014, 12:07:03 AM »

I agree. That's not a look that does anything for me.
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Jon Mello
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firstgenaddict
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« Reply #147 on: March 28, 2014, 11:13:52 AM »

Here is an early configuration of Titus's 69 car, it has a duct taped 68 front bumper on a 69 styled body

https://revslib.stanford.edu/catalog/nc991hs6427

Better pic of the front end

https://revslib.stanford.edu/catalog/hx133kv3882
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James
Collectin' Camaro's since "Only Rednecks drove them"
 
Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://picasaweb.google.com/112392262205377424364/1969_Z28_Restoration
Swede70
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« Reply #148 on: April 23, 2014, 04:10:41 PM »

Greetings,

Now for something completely different!  See link to pdf file of a Japanese motor racing magazine examination of the '69 T-G Racing Firebird Trans Am/SCCA Trans-Am effort.  I'd never seen the photo image depicting a Superbird/Charger Daytona high wing (plus discreet vents/bubbles on the top of each fender consistent with reproducing the concept entire) on the 1969 prototype before, hence something surely to mull.  Wait! - when was the Charger Daytona developed, and who was Paul Lamar befriending and chumming around with in period?  Fun regardless, and an alternative conception of Stardust memories...

http://www.rotaryeng.net/Japanese-TransAm.pdf

Mike K.
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JoeC
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« Reply #149 on: April 23, 2014, 08:24:31 PM »

I don't know if this has been posted but there is some interesting Firebird TA stuff here

http://musclecarfilms.com/1969_Firebird_Engineering_Cars_2.html
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