351M backfiring through carb

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Dec 20, 2011 | 11:44 AM

#16

mark a.

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Joined: Mar 2004

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I'd check the preload on every lifter when you have it apart. Most of the time you can't just get away with throwing a cam in and expecting it to work. Most all aftermarket performance cams have a different base circle that will cause preload problems that can act as you have described.

Dec 20, 2011 | 08:14 PM

#17

crsmiffy

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Joined: Jan 2011

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From: Tanilba bay NSW Australia

"I'd check the preload on every lifter when you have it apart. Most of the time you can't just get away with throwing a cam in and expecting it to work. Most all aftermarket performance cams have a different base circle that will cause preload problems that can act as you have described. "
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I believe that you wrote you had a rebuild book. If it's tom monroes excellent tome it mentions how to check the preload on the lifters. You may have to shim some/all/none of them, or as I had to do grudgingly remove some material from either the rocker mount on the head (pain) or from the rocker sled (what I did) as it had too much clearance.