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Old 10-13-2010, 01:26 PM
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What degree should the motor be set at?

I had the 4.3 set at 5 degree down. I placed my level on the edge of the head.

Should I do the 350 the same 5*? Since I have to redo the tranny x-member, I wanted to make sure & get it right.

Also, putting it on the head ok?

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Old 10-13-2010, 01:43 PM
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With the body level, somewhere between 2 and 3 degrees is about right. I always installed the intake manifold and leveled off the carb pad, which is cut on a downhill angle to the centerline of the crank.
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Old 10-13-2010, 02:05 PM
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Quote:
Originally Posted by techinspector1
With the body level, somewhere between 2 and 3 degrees is about right. I always installed the intake manifold and leveled off the carb pad, which is cut on a downhill angle to the centerline of the crank.
Thank you very much!
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Old 10-13-2010, 03:14 PM
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What angle is the pinion at? those two angles must be the same.

dave
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Old 10-13-2010, 03:27 PM
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Quote:
Originally Posted by 2old2fast
What angle is the pinion at? those two angles must be the same.
dave
They don't have to be exactly the same, but within a degree or two works ok. In a street machine, if I put the motor in at 3 degrees down bubble, then I try to put the pinion in at 1 to 1 1/2 degrees up bubble. That way, with a little power applied to the pinion when cruising, it will climb the ring gear a little due to compliance in the suspension and the angles will cancel each other.

A drag race car is a whole different animal. The action is so violent that there might be up to 8 degrees difference, depending on the type of rear suspension. You'll see the most difference on a leaf spring car. The whole idea is to line up the angles to cancel each other out at extremes of torque input into the pinion. In other words, in the case of a leaf spring car, if the motor is installed at zero, the pinion might be at 8 degrees down bubble.

It all depends on the power you will apply to the pinion and what type of suspension you are using. You might only want a degree or two difference with a 4-link car or ladder bar car, just enough to take up the slack in the system.

I've always wanted to set up a video cam under a drag car and watch the pinion angle change as the driver goes through the gears. I think that would be interesting. Maybe I'll try to get that done before the end of the year.
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Old 10-13-2010, 03:41 PM
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Do like Tech-inspector said in his first post. Put the engine in the car with the intake manifold that you are running. Make sure the car is at ride height and the put a level on the manifold where the carb will mount. Level the engine by raising and/or lowering the tranny mount. If this is all in a stock set up it should be OK ie. stock motormounts, tranny mounts and rear end mounts. If you are doing a conversion, get the motor and tranny mounted this way and then post back on what angle the rear end should be set at.
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Old 10-14-2010, 07:37 AM
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Factory setting of the centerline of the 350 small block Chevy crank is 4 degrees down in the rear of the engine. See scanned image from factory manual below. Left click for a larger view. This will be with the carb mounting surface of the intake manifold level front to rear and side to side with the vehicle at 'normal' ride height.

For drag only the pinion angle will usually be set in a down position so that when under hard acceleration the angles will be somewhat parallel.

The centerline of the pinion gear should be set at the same angle but up to keep the two centerlines parallel to each other with no load.

The centerlines can be offset side to side but must be parallel when looking from the side or from above.
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Old 10-14-2010, 08:47 AM
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I set the frame level, Then set the carb base on the intake level..
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Old 10-14-2010, 06:17 PM
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check this link out, it seems to get it right http://www.hotrodhotline.com/md/html..._harmonics.php
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Old 10-14-2010, 07:38 PM
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Complements to the guys answers to the posters questions

Great detailed info!
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Old 10-15-2010, 12:57 PM
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Quote:
Originally Posted by GMC boogie
Complements to the guys answers to the posters questions

Great detailed info!
Yes, That is why I love this site..they give very detailed info.
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