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Old 02-10-2009, 06:30 AM
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Modifying 86 and earlier SBC intake for 87>

I have searched and read many articles related to using the older 55-86 SBC intake manifolds on 87-95 style SBC with cast iron heads and canted inner center bolts. The only information I found was to elongate the holes, extra sealant and large washers. Well, I am not comfortable knowing the bolt head is not square to the surface when tight, generating undue stress and possibly breaking from fatigue. Somewhere I read that someone bought an intake with adapters to do so. Are there any adapters available to use with the elongated holes? OR, what's the difference in the two bolt angles to make some if there are no such adapters to buy? What else did you guys do? Thank you in advance.

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Old 02-10-2009, 10:01 AM
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Quote:
Originally Posted by fierosum
I have searched and read many articles related to using the older 55-86 SBC intake manifolds on 87-95 style SBC with cast iron heads and canted inner center bolts. The only information I found was to elongate the holes, extra sealant and large washers. Well, I am not comfortable knowing the bolt head is not square to the surface when tight, generating undue stress and possibly breaking from fatigue. Somewhere I read that someone bought an intake with adapters to do so. Are there any adapters available to use with the elongated holes? OR, what's the difference in the two bolt angles to make some if there are no such adapters to buy? What else did you guys do? Thank you in advance.
The surface where the bolt head rests needs to be in the same plane. There are two ways of getting there:

- Mill a seat into the manifold at the proper angle.

- Use Spherical or self aligning washers see example here http://www.nolansupply.com/supertc.a...rs+-+Spherical

The thing you need to do is keep track of how much miss alignment the washer can address, some only go to 7 degrees others to 15 of so. What you'll need is right on the high side.

Bogie
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Old 02-10-2009, 10:10 AM
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I asked edelbrock this when i wanted to use my old performer rpm intake on my 89 tbi 350. They told me all i had to do was elongate the two center holes in the intake on each side where the intake bolts to the heads.
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