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Old 09-09-2014, 12:19 PM   #27
gchemist
BAD BOW-Silverado XST
 
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Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
Re: 86 GMC PU with new crate 350 getting 8 MPG.

Wow, without a bigger cam the carb is too big. On my ZZ4 with 355 hp a 1406 works great. The 1407 may work with the smallest jets possible or better tuning.
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