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Powerful PONTIAC'S


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#1 LeadfootLightnin'

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Posted 01 December 2003 - 09:33 PM

Powerful PONTIACS
Let's see some Classic PONTIAC Muscle?


I wish I still had my 455 4spd. Trans Am like this...





Looking from the outside, you'd be hard pressed to tell the '71 from the '70, as the visual clues are minor. The one visual clue is the soon to be trademark of a Trans Am- lettering the engine displacement on the shaker. Perhaps Pontiac wanted to let everyone know there was a new and torqueier engine residing beneath the shaker.

Nineteen-Seventy-One marks the year in which the engine most associated with the Trans Am made it's debut. The 455. This new engine was the 400 stroked .46 inches (to 4.21 vs 3.75 inches) and offered a bit for more torque - 480 gross lb/ft of torque to be exact. To be more exact, the new net torque ratins were 410 lb/ft @ 3600 prm. The increase meant the engine was now "oversquare" , meaning the stroke was longer than the diameter of the cylinder bore (4.12"), henceforth a 5500 rpm redline. The engine, coded as YE or YA when coupled to an automatic and WL or WC when installed in front of a 4-speed, featured a four-bolt main bearing block and aluminum intake manifold.The new engine was not without compromise, however, as the horsepower numbers dropped off a bit as compression ratios took the first plunge into mediocrity. In 1970 the 400 V8 featured a 10.5:1 compression ratio, while for '71 the ratio dropped to 8.4 as the auto makers were succumbing to the pressures of the insurance companies.

Since the 455 was an oversquare engine, Pontiac engineers used lighter parts in the reciporcating assembly to reduce mass, therefore relieving stress. Each piston lost 1 1/2 oz each to reduce the mass. To make the engine stronger, the crankshaft main bearing journal diameter went from 3.00" in the 400 to 3.25" in the 455. All crankshafts were cast of nodular iron rather than standard cast iron for increased toughness.

No longer were there any "ram air" references, as this engine performed it's last service of duty the prior year. On the bright side, the 455 posted good horsepower numbers, still producing 335 gross hp at 4800 rpm or 310 net @4800 and the aforementioned 480 lb/ft of torque at 3600 rpm. A new cylinder head casting, #197 replace the mighty "Ram Air III and IV" cylinder heads. The head was unique to the 335 hp engine, as the "other" 455 engines had the #66 casting. The camshaft lost a great deal of lift in the 400 to 455 switchover. On the Ram Air IV 370hp engine, the valve lift for the intake/exhaust valves were .527/.527 inches respectively. The 455 used the part number 9779068 camshaft, the same as the R/A III, and it developed .408/.406 inches of lift respectively. Also missing was 20-degrees of intake and 18-degrees of exhaust valve duration. On the plus side, the 455 H.O. in the Trans Am still reatined screw-in rocker arm studs.

Atop the engine sat a cast aluminum intake manifold with a separate cast iron crossover for exhaust gases recirculation. By making this a separate piece, it didn't take owners long to remove this as to increase power. A Rochester Quadrajet 4-bbl carburetor sat below the shaker/air cleaner assembly.

The H.O. engines still had the desirable "round" exhaust port rather than the "D" shaped ports of mainstream 455's. Another desirable quality of the 455 H.O. engines was the select fit porcess during line assembly of the engines. This allowed for closer tolerances resulting in a nearly blueprinted engine - direct from the factory.

A conventional distributor was still used, and it carried pn 1112073 and ignited AC R-46S spark plugs set at .035"

Three transmissions were offered, the standard M13 three speed HD manual, the RPO M40 TurboHydraMatic 400, or the close ratio four speed manual RPO M22 rock crusher transmissions. The gearboxes were ideally matched for the generous levles of torque the 455 could supply. At the rear of the car, the famed GM 12-bolt rear end was no more, replaced by a bit less sturdy 10-bolt. Three axle ratios, 3.08, 3.42, and 3.73:1 were offered, depending on transmission and equipment choices.

The shaker scoop was still functional as the exterior engine noise level standards hadn't legistated this neat feature out of production. As on the '70 models, the solenoid activated flapper and this was still an axiliary source of cooler air as the air cleaner ingested air normally through dual snorkels.

The rest of the outside was carryover for the most part. Color choices were still limited to cameo white with blue stripes and shaker or the lucerne blue with a white stripe/shaker combo. The engine displacement decal were the same color as the exterior. The poly cast honeycomb wheels made their debut in '71 and would remain popular until replaced by the aluminum snowflake of 1977. These wheels were quite deceptive as they certainly had the look of a "mag" wheel. Nothing could be further from the truth however, as these wheels were merely steel 15" x 7" steel wheels with a ruberized metallic silver honeycomb center (the first composite wheel?).

Inside, the T/A received the high-back bucket seats. These seats would remain in basic form until the advent of the all-new 1982 models. The only other seat style offered during the 71-81 production run were the Recaro buckets offered in the '81 NASCAR edition. The high back style if the seats were very much in vogue in the early seventies. They gave a wrap around feel to the interior, while being somewhat comfortable.

Somewhat is stressed because for some reason, Detroit had a problem with building cars with adjustable seat backs. (the Chevrolet Camaro did have an optional two-position seat back adjuster). The seat was very upright, but this was almost necessary with the formula steering wheel. Matching up to the front seat center console was a rear seat console which extened from the rear of the front one and filled in the otherwise carpeted void of the rear seats. Pontiac introduced an option that proved to be ahead of it's time, a cassette tape player. In a world where the 8-track was king, the cassette player was a much undesired option. I personally have never seen one in a Trans Am (or Firebird), and my guess is this would be a rare piece. Another new option, an in car rechargable flash light could be had for a mere $12.64.

The base price increased to $4595.00, a $290.00 increase over the 1970 version. Production of the Trans Am dropped to a mere 2116 cars, nearly a 50% decrease form the 3196 1970 models built. Automatic's outnumbered manuals 3-to-2 with 1231 buyers opting for the turbo 400, and 885 going for the "rock crusher"

1971 was certainly a pivotal year to the Trans Am, with legislators pushing for clean air and less horsepower, many feared the newly designed Firebird and specificly the Trans Am would be a short lived "nice try".


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1971 Trans Am Production Engine Code Trans Production Total
455 H.O. WL, WC 4M 885
455 H.O. YE, YA 3A 1,231
2,116
Color & Trim Codes Exterior Colors Code Interior Colors Std Trim Code Custom Trim Code
Cameo White 11 Blue Vinyl 201 Vinyl 211
Lucerne Blue 26 Ivory Vinyl 212
Saddle Vinyl 203 Vinyl 213
Sienna Vinyl 214
Jade Vinyl 206 Vinyl 216
Sandalwood Vinyl 207 Vinyl 217
Cloth &Vinyl 227
Black Vinyl 209 Vinyl 219
Cloth & Vinyl 229
Engines Gross Figures
CID-Version Code Trans HP@RPM Torque@RPM
455 HO Wl, WC 4M 335@4800 480@3600
455 HO YE, YA 3A 335@4800 480@3600
Net Figures
CID-Version Code Trans HP@RPM Torque@RPM
455 HO Wl, WC 4M 310@4800 410@3600
455 HO YE, YA 3A 310@4800 410@3600
Transmissions RPO Speeds Code Usage
M13 3-Manual, HD RM Std
M22 4-Manual, Close Ratio WO Opt
M40 3-Auto PQ Opt
Rear Axle Ratio & Useage Code Useage Ratio
GYG Std w/Auto Trans w/ Air Cond 3.08
CJG Std w/Man Trans or Auto Trans/no air cond 3.42
CGG Opt. Man Trans w/o Air Cond 3.73


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#2 astroracer

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Posted 03 December 2003 - 09:13 AM

Hey Leadfoot,
I am currently building a Pro-Street '73 'Bird. The chassis is mostly done with a little welding on the cage left to do and retinning the interior.
I have most of the bottom end for the .030 over 455 I am putting together for it. SLP pistons, Crower rods, N series crank out of a '70 RA motor and a major deburring and blue printing for the '72 block I am using. I am saving up for a set of E heads and will use their RPM intake with an 850 Holley. Jet hot coated Hookers will be bolted on and a built 2004R from Art Carr will stick the torque to a Narrowed nine inch with 4.88's sitting on leaf springs with a set of home built traction bars... I just need to get her finished up...
Mark

#3 LeadfootLightnin'

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Posted 03 December 2003 - 11:22 AM

Sounds like it is developing into quite the KOOL Car! howyoudoin.gif

#4 Mustang: Ride The Horse

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Posted 29 December 2003 - 09:59 AM

sledder.gif

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Straight lines are for cars.
Corners are for drivers!!!

#5 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:01 AM

Here come the JUDGE :)

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Straight lines are for cars.
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#6 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:01 AM

sign_beer.gif

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Straight lines are for cars.
Corners are for drivers!!!

#7 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:03 AM

RAIV 400 50 miles tease.gif

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Straight lines are for cars.
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#8 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:06 AM

sledder.gif

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Straight lines are for cars.
Corners are for drivers!!!

#9 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:10 AM

02 Trans Am Blackbird # 47 of 50 made $30,000 US 53 miles siterock.gif

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Straight lines are for cars.
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#10 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:11 AM

cool.gif

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Straight lines are for cars.
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#11 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:12 AM

400 CID 30,000 miles sign_beer.gif

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Straight lines are for cars.
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#12 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:13 AM

sledder.gif

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Straight lines are for cars.
Corners are for drivers!!!

#13 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:14 AM

sign_beer.gif

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Straight lines are for cars.
Corners are for drivers!!!

#14 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:15 AM

428 400 HP cool.gif

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Straight lines are for cars.
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#15 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:17 AM

cool.gif cool.gif

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Straight lines are for cars.
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#16 Mustang: Ride The Horse

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Posted 29 December 2003 - 10:18 AM

cool.gif cool.gif cool.gif

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Straight lines are for cars.
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#17 Pegazus

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Posted 07 January 2004 - 09:29 PM

The TV show was bizarre at best, but the car was absolutely stunning - here's another Dean Jeffries' creation: The business end of the Monkeemobile, one of only 2 made. The blower was a fake, but it still got everyone's attention. The #1 car resides in the metropolitan New York City area. The #2 car can be seen at: Star Cars Museum, 914 Parkway Gatlinburg, Texas. If anyone hears either car is going on tour, I'd like to hear about it. Here's an excellent link to see more photos: http://groups.msn.com/TheMonkeemobile/thecar.msnw

UPDATE! See below for news of where you can go and see this bizarre car!

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.....no one shifts below 4000rpm, right??

#18 Guest_Spenc_*

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Posted 07 January 2004 - 09:55 PM

Hey! easy on the MONKEE'S, that show ROCKED! cool.gif Got any more of one of our all time fav TV Hot Rods?

#19 Mustang: Ride The Horse

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Posted 08 January 2004 - 08:10 PM

Here is one for you Spenc :lol:

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Straight lines are for cars.
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#20 Guest_Spenc_*

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Posted 08 January 2004 - 11:23 PM

"I'm BATMAN" cool.gif

Actually after seeing some of these latest Gallery additions, I'm starting to hear the sweet whine of a Giant Blower Motor? ( perhaps project MILD 2 WILD will get a little more WILDER than we first thought :unsure: )

#21 Mustang: Ride The Horse

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Posted 09 January 2004 - 12:14 PM

That's What MILD 2 WILD Is All About DUDE cool.gif Oo/ cool.gif
Straight lines are for cars.
Corners are for drivers!!!

#22 Pegazus

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Posted 10 January 2004 - 07:13 PM

"The Car", another George Barris design, has a Lincoln Mark III chassis with a 455 cubic-inch engine and an attitude. Six cars were built for the film, one steel 'principle' car, and five clones. WHAT EVIL DRIVES THE CAR...... the cult movie trailer: http://www.suncoast.com/Movies/Movie.aspx?...=review&prodid=

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.....no one shifts below 4000rpm, right??

#23 Mustang: Ride The Horse

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Posted 19 January 2004 - 07:04 PM

cool.gif Full PHS documented 69 Judge Convertible One of 108 Judge Convertibles made in 1969! One of 74 that were 4spds Frame-On restored 4 years ago. 400 Ram Air III, SR block with correct heads, intake,carb. Have RAIV intake on car now, have original intake as well. New exhaust. Hideaway headlights Hood Tach Power Windows Still working 8-track player Runs and drives beautifully. I drove this car frequently to exhibits and shows. Not a trailer show queen, just an original beautiful Judge Convert.
Technical Data: The overall condition of this car is Excellent. It has 50000 MI on the odometer. The engine is a 400 CI with 8 cylinders producing 366 horsepower 455-ft lbs of torgue. The transmission is a Manual 4 speed and the drivetrain is 2WD. The Paint color is Carousel red and the interior color is Black. VIN number: 242679B176504 sign_beer.gif
$120,000 US
tease.gif

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Straight lines are for cars.
Corners are for drivers!!!

#24 Mustang: Ride The Horse

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Posted 19 January 2004 - 07:05 PM

sledder.gif

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Straight lines are for cars.
Corners are for drivers!!!

#25 Mustang: Ride The Horse

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Posted 19 January 2004 - 07:11 PM

sign_beer.gif 1970 GTO JUDGE 400ci 4 SPEED siterock.gif PALLADIUM SILVER VERY RARE COLOUR cool.gif
366HP-445 FT-LBS OF TORQUE - HAS ALL IT"S PAPERS sledder.gif
$299, 000 US
tease.gif

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Straight lines are for cars.
Corners are for drivers!!!

#26 Mustang: Ride The Horse

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Posted 19 January 2004 - 07:13 PM

cool.gif 2KooL cool.gif

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Straight lines are for cars.
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#27 wwwallis

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Posted 06 November 2004 - 02:43 PM

this is my firebird
1980 it has a hard top also a soft top
motor is a 70 400 big block with nos holeshot setup

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#28 wwwallis

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Posted 06 November 2004 - 02:47 PM

another

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#29 Pegazus

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Posted 07 March 2006 - 11:40 PM

Update on the Monkeemobile! #1 and #2 cars were made by Dean Jeffries. The photo (12 posts above this one) posted earlier is the # 3 car, made from a Le Mans by Dick Dean.

The #3 (the tribute car) will be at Cool Scoops, North Wildwood NJ on 30 April 2006 at 1pm, along with a tribute band and Peter Tork from the original MONKEES band.

For more info (and map) go to the COOL SCOOPS website and look up the SUPER 60s SUNDAY advertisement: http://www.coolscoops.com

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.....no one shifts below 4000rpm, right??