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if it is constant its possibly an exhaust gasket leak,if intermitant could be a lifter or rocker arm. get a stethiscope or a broom handle and listen to the affected area for either valve train noise or exhaust pecking thru a leaky gasket
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1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach
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Better to burn out than it is to rust
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