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Re: 72 GMC Short Step Build
great thread! your first tpi setup brought me here, then i ended up having to read through everything!
16.5mpg seems low with that tuned port setup. maybe i missed it, but what gearing do you have in the rearend? when my 1991 z28 was still L98 tpi powered, it would easily pull down 25-27mpg on the highway with a 3.23 gear and 25.7" tire.
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1999 GMC Suburban K2500 SLT, 454/4L80E
1991 Z/28, 6.0L/T56
1949 GMC 250, S10 Frame, 6.0L/4L80E
Instagram @aceshighspeedshop
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