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#1
12-24-2009, 12:00 PM
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Nylon Timing Gear Teeth What Years?
When did Pontiac stop using the nylon tooth gears? Thanks -Jim
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#2
12-24-2009, 12:56 PM
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#3
12-24-2009, 12:57 PM
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Why should that matter at this point in time.
If you have a old motor that is still running you can check the condition of the chain by just pulling all the spark plugs and the distributor, than grab the balancer and move the crank back and forth some. You should see the distributor rotor follow right along if the chain is good. In fact if you spin the motor over thru one full rotation you can tell if the cam gear has a chipped nylon tooth by the rotor falling behind a good amout. If I recall right, it was thru mid 66 that the nylon gear was used.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#4
12-24-2009, 01:40 PM
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I could have sworn that my 79 Firebird, with a 301, had nylon timing gears.
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John  "There are no stupid questions, but there are a LOT of inquisitive idiots!" |
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#5
12-24-2009, 01:58 PM
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#6
12-24-2009, 02:19 PM
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no, it was later than that. I was riding in a '69 or '70 when the gear went on a trip from Yosemite to San Diego.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
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#7
12-24-2009, 02:21 PM
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67 Lamnas has it right.
1971 was the last year.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#8
12-24-2009, 03:26 PM
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Jim, I had a 70 with the nylon gear and a 73 without. So I tend to agree with the others re: 71.
__________________
 ___________________________________ "Objects in mirror are closer than they appear" 
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#9
12-24-2009, 03:37 PM
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Thanks guys. I have almost lost my Christmas spirit with this motor! Broke off 2 exhaust bolts flush and now it looks like I need to swap the chain. It is kinda funny. It all goes so well in my imagination-LOl. Merry Christmas to all! -Jim
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#10
12-25-2009, 12:18 PM
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One of my high school buddies 350 68 Tempest lunched after he shut it off at his girlfriend's house. Came back out to leave and all kinds of popping and wouldn't restrart. Better than the 6500 deal!
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#11
12-25-2009, 12:23 PM
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My 71 T-37 had one. Let go at 85,000 miles!
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78 Grand Am,455,KRE D-Ports,Turbo 400 conti conv,3.42 Rear |
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#12
12-25-2009, 01:00 PM
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#13
12-25-2009, 01:18 PM
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All GM engines except for the L6 used this nylon gear POS. Even Ford used them. I had a 70 390 that failed when a piece of the gear wedged into the oil pump shearing the oil pump drive shaft causing the loss of oil pressure on the highway. Ruined the block.
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“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
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#14
12-25-2009, 05:47 PM
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The nylon gear in my 67 HO let go in early 1970 at 72,000 miles. The teeth remained in the pan until I pulled the engine in the mid 80's. I was lucky in that I was backing slowly out of my driveway when the engine just quit.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
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#15
12-25-2009, 07:51 PM
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There's certain 'coincidences' that take place in life. I have a '72 Grand Ville convertible with the still original 455. The engine has 215,000 miles on it and has been my daily ride for nearly 8 years. 65,000 miles ago, I put a NOS timing set on it with (you guessed it) a nylon top gear. I was thinking that maybe I should change it, so 2 days ago, I bought a replacement set - OE style Cloyes (with steel gears), then I came across this post - I have a certain job to do on my car tomorrow.
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#16
12-25-2009, 08:03 PM
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Quote:
I had a complete '69 Grand Prix Model J given to me because the teeth were stripped off of the nylon cam sprocket at 97K miles. Bent all the pushrods and maybe a few of the valves, the pistons were all fine and the bore had little to no ridge so I reused them. |
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#17
12-25-2009, 08:22 PM
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I changed a lot of the things and removed a lot of oil pans/ oil pumps at my uncles' Pontiac Dealership, years ago. It was amazing that some of them even had any oil pressure with the crap in the pick-up screen.
I remember when Bill Jenkin's used to swear by the things as dampening the harmonics in the valvetrain/ camshaft. Maybe Bill was being paid to ease the racer's minds that everything was ok with a new chain and Nylon toothed upper gear even with a big camshaft. Tom Vaught ps They would shell big time when a guy was using the clutch to slow the car down after a higher rate of speed, pretending to be a road racer. . The camshaft/valvetrain still had a lot of inertia and you suddenly slowed down the crank with the clutch, goodbye gear.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#18
12-25-2009, 10:10 PM
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I was teaching auto tech in Clovis N.M. in 1972 when a fellow teacher had his timing gear and chain replaced. His Pontiac was a 68 Catalina with about 58,000 on it. When I saw what his gear looked like I immediatly replaced the gear on my 67 Cat 325 hp 400. My gear and chain were pristeen. They looked like they just came from the factory. Funny how stuff works. I changed it any way. The local pontiac Guru told me to use a Tempest 4 cylinder gear and chain,which I did.
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#19
12-26-2009, 06:11 AM
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Back in the 1980's I helped a guy out in my spare time who swore by the Speed Pro wide link plate timing sets with the nylon top gear. He ran a small automotive repair business, and used them successfully in high Big Block Chevy engines. He had two cars that raced nearly every weekend out of his shop. One was a 67 Camaro powered by a 396, the other was on old Pro Stock chassis with a 454 in it. The Camaro ran high 11's, the Pro Stock car high 8's to low 9's depending on which engine was in it at the time.
In all the time that I knew him, they never once had any failures with those timing chains/gears. I remember he'd pull the engines and freshen them up on occassion, and we'd inpect the top gear and put it right back in service. Even when I built engines for my own cars, I'd chicken out and use the wide link plate sets with the iron top sprockets. Never had the first trouble with one, and I'm using one in my current 455 engine. I like the design and strength of the link plate sets, even though they are somewhat of a PITA to degree the cam having to use offset cam/crank keys......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#20
12-26-2009, 06:27 PM
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Well fellas I got lucky. Today I pulled the fuel pump and peered in thru the hole, she has steel teeth! This is a 1970 455/370HP/XF, the guy that sold the car to me was the 2nd owner and he purchased it with about 40,000. So, either it originally came with a steel gear or the 1st owner had already changed it. I did go back and double check the VIN` with the block and it is number matching. So who knows. I would say to all that if you are not sure what you have then pull the fuel pump and check. Shredded nylon teeth are a terrible experience. Thanks to all. -Jim
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