Difference - LWB and SWB fuel tanks? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kevinr1970 · 03-13-2006, 04:21 AM

Are they the same or different? If different, could I use SWB tanks in place of LWB tanks?

Reason for asking is I have an '86 GMC 4x4. I replaced the engine with a rebuilt engine with a hot cam and although I have finally gotten it to run right, the mileage is extremely poor and judging by the smell of the exhaust at idle its never going to pass smog test.
I have a 2wd Blazer project with no emission concerns that could use this engine. I have an '87 parts truck with TBI 305 that I would love to put in the GMC as I drive it fairly often and could use the better mileage.

03-13-2006, 04:21 AM	#1
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Difference - LWB and SWB fuel tanks? Are they the same or different? If different, could I use SWB tanks in place of LWB tanks? Reason for asking is I have an '86 GMC 4x4. I replaced the engine with a rebuilt engine with a hot cam and although I have finally gotten it to run right, the mileage is extremely poor and judging by the smell of the exhaust at idle its never going to pass smog test. I have a 2wd Blazer project with no emission concerns that could use this engine. I have an '87 parts truck with TBI 305 that I would love to put in the GMC as I drive it fairly often and could use the better mileage. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

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