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Old 05-02-2019, 10:01 PM
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Question Intake Manifold Flange torque Spec 88 EVO

Greetings, all. I was finishing a rebuild of an '88 Softtail, with an S & S Super E Carb, and over tightened the intake manifold bolts, breaking the front manifold flange. I've obtained new ones, but wonder what the torque spec for these bolts is. It's also an S & S manifold, with their flanges, but I can't seem to find even the stock Harley torque spec for these bolts. Neither my "Clymer Evolution 84-99 Models" or my "Haynes Shovel head and Evolution BTs 70-99" books list that spec. Not that I could get a torque wrench in there anyway, but I'd like to have an idea of what I'm trying for. Any suggestions on how tight to take these bolts? They are socket head bolts, so I'm using a 1/4" Allen wrench.
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Old 05-03-2019, 12:44 PM
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I have never had any problems just using feel, you can feel a bolt when it starts to reach it's
stress point,tighten it down until the action slows exponentially ..Crank the engine and let it heat up and then go back, if it doesn't move then you are good. Try practicing on something else first..
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Old 05-03-2019, 06:09 PM
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Feel is the only way to tighten them, draw the down evenly but make sure the manifold is in it’s final position. To do this you need to install the carb and air cleaner backing plate, that way the intake will seal properly.
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Old 05-04-2019, 08:28 PM
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Thanks, I'd forgotten that the air filter backing plate bolts to the heads, and the holes need to line up, so I mounted the carb and AF backing plate, then snugged up the manifold flange bolts. I figured that I can't tighten them too much, having broken one already, but wondered if Harley has published a specific torque. I'm pretty good at the calibrated wrist getting close to a torque value, like on a smallbolck Chevy intake manifold (pre '86), where you can't get a torque wrench, and wanted to get close to that published torque, but this info is good enough to get me by, so thanks again.
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