Big Block Proof
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,746
Likes: 428
Big Block Proof
Hi guys,
I am looking at a 66 Roadster that was originally a 427 car, that now has a 71 corvette 454 in it. It has vin # 1676 so does that qualify it as a early big-block car. I think I read that B.B. Roadsters with vins between 1000 and 3000 were built with hood support on the passenger side. It has big block motor mounts, large sway bar and radiator and support. Large Fuel Line too. The max Oil presure gauge is 80psi,Tach is yellow lined between 63 and 65 and Red lined between 65 and 70.
What is the max pressure on the oil gauge? Where are the yellow and red lines at on tach for a 66 big block roadster.
Thanks livin,
I am looking at a 66 Roadster that was originally a 427 car, that now has a 71 corvette 454 in it. It has vin # 1676 so does that qualify it as a early big-block car. I think I read that B.B. Roadsters with vins between 1000 and 3000 were built with hood support on the passenger side. It has big block motor mounts, large sway bar and radiator and support. Large Fuel Line too. The max Oil presure gauge is 80psi,Tach is yellow lined between 63 and 65 and Red lined between 65 and 70.
What is the max pressure on the oil gauge? Where are the yellow and red lines at on tach for a 66 big block roadster.
Thanks livin,
Melting Slicks
Joined: Aug 2004
Posts: 2,479
Likes: 12
From: New York
VIN 1676 would defiantly qualify for an early car; BUT besides the obvious tach, motor mount, etc, do you know that it was a 427x450? or 427x390?
BB (427x450/425) Tach - 6500
BB (427x390) Tach - 5500
BB Oil Pressure (427x450/425) - 80lb
BB Oil Pressure (427x390) - 60lb
Early BB (427x450/425) Hood Support on Passenger side
Early BB (427x390) Hood Support on Driver side
BB (427x450/425) Tach - 6500
BB (427x390) Tach - 5500
BB Oil Pressure (427x450/425) - 80lb
BB Oil Pressure (427x390) - 60lb
Early BB (427x450/425) Hood Support on Passenger side
Early BB (427x390) Hood Support on Driver side
Le Mans Master
Joined: Jul 2003
Posts: 6,808
Likes: 24
From: Westport CT
66 vs 67 390 hp had a diff redline.
here is a redline synopsis for the C2s:
63-66 327 - 250/300 5300
63-65 327 - 340/360/365/375 6500
65-67 327 - 350 6000 (early L79s may have 5300)
65 396 - 425 6500
66 427 - 390 5500
67 427 - 390/400 6000
427 - 425/435 6500
here is a redline synopsis for the C2s:
63-66 327 - 250/300 5300
63-65 327 - 340/360/365/375 6500
65-67 327 - 350 6000 (early L79s may have 5300)
65 396 - 425 6500
66 427 - 390 5500
67 427 - 390/400 6000
427 - 425/435 6500
Instructor
Joined: Aug 2005
Posts: 205
Likes: 1
From: West Bend WI
Big Block Proof
Based on what I recently learned, you can search for the following items as well to verify that it is a BB car:
- Rear half shaft retainers, BB cars use seperate bolts with a cap that is similar to a main bearing cap in a motor. Small blocks cars use a simply u-joint with two nuts (stamped / formed piece)
- All 66 BB had transistor ignition therefore if you look on the driver side up near the head light you should see three drilled holes for the transistor box or if you are lucky, the box is still there.
- BB had a different throttle arm than the small bocks
- The rear end has stamped numbers at the bottom of the case, if you can retrieve these numbers, it will state the motor and the HP of the car.
- Rear half shaft retainers, BB cars use seperate bolts with a cap that is similar to a main bearing cap in a motor. Small blocks cars use a simply u-joint with two nuts (stamped / formed piece)
- All 66 BB had transistor ignition therefore if you look on the driver side up near the head light you should see three drilled holes for the transistor box or if you are lucky, the box is still there.
- BB had a different throttle arm than the small bocks
- The rear end has stamped numbers at the bottom of the case, if you can retrieve these numbers, it will state the motor and the HP of the car.
Navigator
Joined: Sep 2005
Posts: 9
Likes: 0
could anyone describe the throttle arm i am having the same issue with a car that is missing the motor, I have also heard that there is a difference in location of the heater hoses in the firewall can anyone verify that. Also a guy gave me a printing of something he found in a book which lists rearend codes and in 65 the big block cars all had thir own specific rear end code . i dont know if the cranky guy that has the car will let me get under there and look though.
Instructor
Joined: Aug 2005
Posts: 205
Likes: 1
From: West Bend WI
66 BB Proof
Another thing to look for is the radiator overflow. On a BB, the bag is located on the driver side on the inner wheel well. Also, I think the hood support is suppose to be on the passenger side for a BB, not on the driver side.
SAS
SAS
Le Mans Master
Joined: Apr 2002
Posts: 5,537
Likes: 280
From: Egg Harbor Township NJ
2015 C2 of Year
St. Jude Donor '04-'05-'06-'07-'08-'09-'10, '14-'15
Originally Posted by jrsimm81
could anyone describe the throttle arm i am having the same issue with a car that is missing the motor, I have also heard that there is a difference in location of the heater hoses in the firewall can anyone verify that. Also a guy gave me a printing of something he found in a book which lists rearend codes and in 65 the big block cars all had thir own specific rear end code . i dont know if the cranky guy that has the car will let me get under there and look though.
The Big Block arm stands up or curves straight up and has a small notch cut out of it.
Go to Long Island Corvette supply and search for the rod..They will list the differences and application for all 63 67's arms.
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
The 390hp didn't have T.I. standard, although it was available as an option; it was a mandatory option on the 425hp L-72. There's no difference in heater core nipple locations between SB and BB, and no midyear Corvette ever had a radiator overflow bag. All '66 BB cars used copper/brass radiators with the cap on the radiator and no separate expansion tank, and all SB cars had aluminum radiators with separate expansion tanks. All BB midyears had specific rear end codes, different from SB cars with the same ratios (because of the bolted yoke caps). '66 BB axle codes were AT, AU, AZ, FA, FB, or FC, and all were Posi.
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