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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