Thanks for clarifying the 12 bolt rearend for these engines. As for the fan question; I got some reading glasses and got my answer from the '65 Beaumont brochure. All the 327 engines in that year had thermostat fans.
Some questions regarding the equipment that came with the L30 250 hp 327 and the L74 300 hp 327 Acadian Beaumonts in 1965.
Did they come with 12 bolt rear ends like the L79 350 hp car? Did they also come with thermostat radiator fans ?
I was hoping to get you an answer from the parts book. I "think" I did. I would have thought any V8 could be had with HD cooling and that a fan clutch would be part of that option but not according to this:
Blade, fan ___________
3839282 64-65/ All with 194, 230 and 283 engine
3789562 64-65 all with 4 BC/ 283 and 327 engine
I would say that tells us all 283 2 barrels have no fan clutch.
I would say that tells us all 283 4 barrels have a fan clutch
I would say that tells us all 327 engines have a fan clutch (because there was no 327 2 barrel engine available.)
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
1965 was a bit funny. After only having the 10-bolt through 1964, for 1965 all 327 cars used a 12-bolt rear. Even a 250-horse 327 with a Powerglide would have come with a 12-bolt that year.
For 1966 there was a regression in that department, all 327s only came with the 10-bolt rear again (except the L-79 Acadians)
In 1967 it is generally thought that the 10-bolts were used on all Beamont & Chevelles through the 327 275-horse engines, but it is not commonly known that if you ordered a 4-speed with the 275-horse engine you got the 12-bolt 3.07 rear rather than the 3.08 10-bolt rear. That also held true in 1968.
1969 was something else different.
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67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.
In garage, 296 cid inline six & TH350...
Cam, Toronto.
I don't judge a man by how far he's fallen, but by how far back he bounces - Patton
This car I am very familiar with. It's a factory 327 4 speed well optioned custom. It has and has always had a 10 bolt non posi 331:1 diff. It's my dads car that he bought when it was less than a year old.
-- Edited by Steve C on Sunday 16th of May 2010 11:52:20 PM
Steve, I can check the books to make sure but it is likely 3.36 ratio if it's a 10 bolt. Can you find the stamping on the passenger side axle tube just to confirm that? That two letter code would state whether it's a limited slip or not, what ratio and whether or not the car has metallic brakes. I'd be curious to see what it has. I have no doubts you are correct if your dad had it that long. I'm more curious to see the different ratios offered in the 4 speed cars.
I am not used to seeing 3.07 or 3.08 with 4 speed like Cameron says but I never say never!
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
Regarding the 3.07 and 3.08 being used with 4 speeds; the brochures say that the '65 327 (250 hp and 300 hp) 4 speed came with a 3.07 and the '66 283 and 327 4 speed came with the 3.08 I can vouch for the '66 beaumont 327 4 speed coming from the factory with a 3.08 as that was what was in my new '66 SD
Yes that would be kind of different.... an L79 in a 2 door sedan. Might even be a bit lighter in weight than the 2 door hardtop that the L79 was usually ordered in. And quite a bit llighter than a convertible with the L79.
Regarding the 3.07 and 3.08 being used with 4 speeds; the brochures say that the '65 327 (250 hp and 300 hp) 4 speed came with a 3.07 and the '66 283 and 327 4 speed came with the 3.08 I can vouch for the '66 beaumont 327 4 speed coming from the factory with a 3.08 as that was what was in my new '66 SD
Just an add on for anyone reading and wondering why there are two almost identical numbers-
3.07 ratio is 12 bolt
3.08 ratio is 10 bolt.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
Okay, if that is a fact; then there have been times when the factory build sheets have not been totally accurate.
For example: I ordered up a 1970 Pontiac Lemans SW with the 400 hi compresion 330 hp motor along with the TH400 and I asked for a heavy duty rear end. The car came with a builsheet which said GU4 3.08 and G80 positraction.
Quite normal looking as 1970 Pontiac Lemans, GTO's and Firebirds usually came with 10 bolt rear ends....so the buildsheet seemed to confirm that.
I had that wagon for 8 years. Along the way in the mid 1970's I took the car to a rear end shop to have it rebuilt. They told me that they found something quite unusual for that model of car. It had a 12 bolt heavy duty Chev rear enSo that would mean that the buildsheet did no match up with what was really at the rear of that car.
After I see what you have to say about this example, I have another example to share with you
Hmm, just going to run to get the parts book and see. I agree with you on the 12 bolts in Lemans (Canadian cars at least) but I'm "almost" ready to say I'll eat my shorts if a 12 bolt Chevy style diff ever had 3.08 gears.......... "Almost" is the key word!
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
