I hate those tube heaters. No offense meant. I worked on lots of them at work for years. Always was an air flow issue. Dirty filters were very common. Our systems were larger and had an air pump/venter motor to move the heated gases. They also incorporated pressure switches for safety. I like the over head Reznor Heaters. Easy to fix and service. Yes and in the warm days of summer the little birds like to build nest in them. Hell, my neighbors truck has been sitting all winter/spring outside and the song birds have made a nest in it.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
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