1966 389 "xs" motor - Pontiac GTO Forum
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post #1 of 5 (permalink) Old 10-31-2004, 11:27 AM Thread Starter
 
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1966 389 "xs" motor

I need info. on how or if i can accurately build a 1966 gto as a factory built ram air gto with the "xs" package. The motor is stamped "xs", with the 744 cam and all associated parts. The question is if i drop this motor into a 1966
that has a 4-spd m21, (need 4.33:1 rear) can I state a bone-stock ram-air car yet not-original car? I have the "xs" motor, not just the dealer installed parts. Did the gtos that were factory-built (possibly 40-50 cars) have a different fire-wall code number? I am extremely particular on all original gto's, but this item has me perplexed on the right thing to do. If anyone has a knowledge or history on this very rare option please help me. Thanks.

pete
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post #2 of 5 (permalink) Old 10-31-2004, 09:22 PM
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Quote:
Originally Posted by gto-pete
I need info. on how or if i can accurately build a 1966 gto as a factory built ram air gto with the "xs" package. The motor is stamped "xs", with the 744 cam and all associated parts. The question is if i drop this motor into a 1966
that has a 4-spd m21, (need 4.33:1 rear) can I state a bone-stock ram-air car yet not-original car? I have the "xs" motor, not just the dealer installed parts. Did the gtos that were factory-built (possibly 40-50 cars) have a different fire-wall code number? I am extremely particular on all original gto's, but this item has me perplexed on the right thing to do. If anyone has a knowledge or history on this very rare option please help me. Thanks.

pete
I doubt (my opinion) they had an accessory code on the data plate for the Ram Air Modification since the cold air components were shipped in each car's trunk and it was up to the dealer or owner to modify the hood scoop to be functional. Here is the web site of Pontiac-Oakland Club International, they have a library which includes an Accessories Catalog for 66 pontiacs. You will have to join POCI to have access to the library.
The car with the ram air installed was rumored to produce 380 to 400 hp, but was only rated at 360 hp. Shortly after the XS engine GM stopped offering cars with the 3x2 carbs except for vettes.
Good luck, I will continue to search for accessory code information on the 66.

Randy



Last edited by 05GTO; 11-02-2004 at 10:54 AM.
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post #3 of 5 (permalink) Old 11-01-2004, 08:06 AM Thread Starter
 
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Thanks for your reply. I believe in order to put a ram-air '66 back to its original or stock form, i believe i need the following: heavy duty fan, 4spd close-ratio, 4.33:1 gearing, metallic-lined brakes, not to mention if there is any info on the color of these 50 cars that came from the factory! If an A/C package was available. I guess my goal, (which maybe impossible) is to put a car back to exactly like it was in '66. Its been 21 yrs. since i owned a gto, ('67 335hp car), and i have a chance to get back into this wonderful world of gto cars. Now if this car is to be done, i wouldn't build it for myself, (to much power for me and to many rare parts). I'm looking for a nice crusier '65, or '66 335hp car). I would think there is a collector out there who would be interested, thus the importance of the above list of items. The only problem would be once finished i don't know if my wife has enough strength to pry my hands from it! Thanks.

pete
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post #4 of 5 (permalink) Old 11-01-2004, 09:46 PM
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I believe the XS option did not include A/C. Here is a link showing if air was available with certain transmissions and it does not show being available with the close 4 speed on the Tri-power car. Also, it shows the standard rear end is a 3.90

1966 GTO Drivetrain Options


Another rare car is the 67 XS and XP which were also Ram Air cars, Around 700 produced and only 100 or so were automatics (XP).

Randy


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post #5 of 5 (permalink) Old 12-09-2004, 07:25 PM
 
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As a of owner of a '66 RA 1 GTO , I can tell you quite abit about them .

1st most of them were done at Royal Pontiac , were they had the xs engine installed/doctored along with the 4 speed . they did not all come w/ muncie's as for the muncie would spit its countershaft to easy .
None of them had A/C . Some of them were also done at Central Pontiac ( They did alot of the 421 trophy cars there .)
They were none insulated and most of them were Sport coupe's .
I believe there was 51-53 cars produced total in '66 . These were dealer built only (remember Gm didnt sanction any racing at this time)

I have seen 13 of them over the years . one hardtop and all the rest were coupes . I'm not sure if the hardtop was a real one but it did have the xs eng code and the tell tail punch in the build tag .(but you wont see any different code/s in the tag ) I also had a '66 Lemans in this same config but its eng was long gone when I got it .

the Engine was hand picked Night casting w/ thin copper head gaskets .022 ,different valve springs ,and didn't always have the 744 cam . (I think this depended on the dealer ) the Heat riser on the tri power was blocked off , and the tri power was rejetted along w/a dist kit and curve,Hi-volumne fuel pump, and larger fuel lines. You should see an arma steel crank , and if it hasnt been raced to death and changed theres a good chance it will still have steel rods also. (remember these were built as out the back door special order superstock cars ) Some of the RA1 cars also had 421's in them and very few kept there 4.33 to 1 rear end in them if any (mine blew up at the starting line )


A few Quirks that they have is an A/C core support and the large desert cooler radiator , anouther item that i believe all of them have is the 6 cyl Frame in them (these cars Weighed 3100-3150 lbs in full dress )

now remember to try to get one back to how they came stock, it would be near impossiable as for they had alot of aftermarket parts tossed at them and were sold to the serious race crowd only . I dont think any of them kept the stock height pyramid valve covers for instance .

So there ya Go, good luck w/ your '66
Please dont hound me w/ emails or any of that ,We would like to keep some of the mystery in our Factory Race cars . I will tell you that the last one I know that was sold in the mid 80's and brought top dollar for being a worn out race car. so who knows I may stop in and anser a few more questions sometime again .
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