Thread: Solving backfire problem on passenger side
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Old 05-01-2006, 06:47 AM
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HSSS427 HSSS427 is offline
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Join Date: Jul 2004
Location: Alpharetta, GA
Cobra Make, Engine: ERA #414 427 s/o w. Shelby Aluminum heads, Edelbrock Performer RPM Intake, Mighty Demon 750, Tremec TKO 600
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So my leading theory is air leak on passenger side. The obvious spot would be primary tubes into collector since it's just a tolerance fit with the tubes sliding into one another. Any suggestions on some type of goop to use to cause that fit to seal up?

Will also check the carb settings, but it is a new Demon that I got from Don Gould at FourSecondsFlat - he adjusted it and tuned it for the engine specs I gave him, but that was 150 hp and 160 ft lbs of tourque ago prior to rebuild. #77s on primary and #80 on secondary.

Could the stage II port and polish and new cam mean I need to re-jet to larger size?

Engine is running smooth ie no missing. Will check compression.

Will try simple stuff first though ie the header pipes.
Thanks!
Scott
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