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Mod | | | Forums66 Topics128,083 Posts1,055,967 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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#78046 05/26/2007 7:08 AM | Joined: May 2007 Posts: 6 Junior Member | | Junior Member Joined: May 2007 Posts: 6 | OK so I got a H/W kit for my 250 Chevy from Langdon's. Put it on started it up. It idles great, advanced the timing a little to smooth it out. She runs good on the primary but, as soon as the secondary opens it backfires (hard) through the intake. Anybody got any ideas??? Jets??? Intake leak??? I gave up for the night I'll get back on her tomarrow. Any insight would be great THANX. | | |
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