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#1
01-12-2010, 08:44 AM
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BB GM Heat Riser # 3940977
Need an NOS one .....
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Eddie M Camaro-less 87 El Camino SS Few Ferrari's 
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#2
01-12-2010, 08:32 PM
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Re: BB GM Heat Riser # 3940977
Ed,
Did your part number supercede another number? I can't find your number in my GM books. I have a GM heat riser but it has another number stamped on it.
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67 Camaro RS/SS 396 Original Drivetrain 70 Chevelle SS 396 Convertible Original Drivetrain 70 Chevelle SS 454 LS5 Survivor Original Drivetrain 70 El Camino SS 396 Original Drivetrain 65 Impala 396/425 65 Triumph TR4 Original Family Owned
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#3
01-13-2010, 05:24 AM
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Re: BB GM Heat Riser # 3940977
if your looking for the heat valve on the passenger side I just bought 3 of them from the dealer. dealer cost is $39.83
#3969903
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69 SS L78 Chevelle 70 SS 396 Chevelle 
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#4
01-13-2010, 07:03 AM
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Re: BB GM Heat Riser # 3940977
I was informed today that the 903 is the only one avail. Im still reserching this - its for a 69 yenko camaro Feb built car. What im told the 903 is what is currently used for quite a while now.
As for the 977 part number - i was given this number as the correct one - so im not sure if its an old number or a mistake.
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Eddie M Camaro-less 87 El Camino SS Few Ferrari's
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#6
01-13-2010, 08:58 PM
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Re: BB GM Heat Riser # 3940977
How do you tell which one you have? I have two saved for my resto. If I put them with the doughnut mount surface down on the table, one has the weight and spring on the left and the other has it on the right. The weight on that's on the left has p/n 3746844 cast into it. The other one looks new. Both picked up at swap meets 10-15 years ago.
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Martin Foltz 68 Camaro SS-396 L35/M20, Corvette Bronze, black vinyl top George Olsen Chevrolet San Francisco
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#7
01-16-2010, 01:42 AM
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Re: BB GM Heat Riser # 3940977
I have one and the exhaust manifolds that we took off my friends Chevelle back in 73 or 74 when we put headers on it. He was going to through em out so I keep them. The dates on the exhaust manifolds are K-7-9 October 7th 69. The heat riser only has a B34 on the balance arm. There looks like it might another number below that but I cant make it out. Is that the number on the bottom of the balance arm ? If it is I will try and make it out.
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#8
11-15-2013, 04:54 PM
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Re: BB GM Heat Riser # 3940977
The 977 number supercedes 3887033 which fit '65 to '68 Camaro Chevy and Chevelle. The '69 396 Camaro used the 3940977 valve which was replaced by the 3969903 by June of '70. This came from the GMPartswiki website. Clint
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#9
11-15-2013, 09:39 PM
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Re: BB GM Heat Riser # 3940977
Did the BB use the 2" and the 2 1/2"? OR is it 2" for small block and 2 1/2" for big block?
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Gary 06A 1969 X33D80 Z28 Unrestored 
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#10
11-15-2013, 10:42 PM
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Re: BB GM Heat Riser # 3940977
2" small block
2 1/2" big block plus 300 horse and up 327's and many 348's and I believe all 409's
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...................... John Brown This isn't rocket surgery.....
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