Author Topic: BB Heater Box vs. SB/6 Differences  (Read 701 times)


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BB Heater Box vs. SB/6 Differences
« on: August 15, 2017, 05:00:18 PM »
I recently had a chance to compare my BB heater box to a SB. I thought they were both the same and the only reason the BB box had a different part number was because of the hose cover or clips or heater core or the rubber hose hole cover. So, I tried putting the core from the BB in the SB box. It did not fit. After closer examination, I found the one thing that is different between the 2 type boxes. The BB welded in heater core plate is approximately 1/4 in. wider. I could probably make the SB work with a BB core, but I would have to modify, I.E. hammer, to make it fit. Below is what I found. I hope this helps someone ID their box in the future. Bottom box is the BB one.
James to strangers, Bentley to friends
1969 SS/RS 396 coupe Hugger Orange X22 712 bought in 79
1969 SS 350 coupe LeMans Blue 713 bought in 79(sold)
1969 307 4spd. coupe Daytona Yellow 711 bought in 85


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Re: BB Heater Box vs. SB/6 Differences
« Reply #1 on: August 18, 2017, 10:07:27 PM »
Good info to know. Would you have measurements? I did not notice when I had mine out. Side by side would be noticeable.

Good job Bentley!