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Discussion Starter #1
Have a set of BBC 12 Degree Profiler heads and each year during the winter rebuild I discover a cracked exhaust guide in the pocket of the port. Anyone have this issue and know why this happens.
 

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I know a guy who makes bolt in guide out of some super strong alloy to prevent this problem. If you want his info I can send it to ya. they require a Kliner though.
 

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Discussion Starter #4
No turbo, little shot of NO2 every now and then though, 100 to 150 shot.

Gas single carb, about 1200 HP on motor.

Please forward the info on those guides.
 
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