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		| RE: 390 Exhaust with fins? | 
	 
		| By BobSprowl - 09/11/2002 7:49:25 AM; IP 152.1.160.205 | 
	 
		| Some F100 and F250 trucks in the '70s had the fins.  I beleive they were added to prevent the exhuast manifolds from cracking.  I never heard of one with fins doing this but the plain ones often do.  | 
	 
 
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