Intake manifold
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[[File:429 CJ Q JET INTAKE 2.jpg|thumb|left|300px|429 Ford factory Q-jet cast iron intake]] <br style="clear:both"/> | [[File:429 CJ Q JET INTAKE 2.jpg|thumb|left|300px|429 Ford factory Q-jet cast iron intake]] <br style="clear:both"/> | ||
| + | ==Small block Chevy intake bolt patterns== | ||
| + | From 1955 until about 1986, all SBC engines had the same 12-bolt intake bolt pattern. In about 1987, GM changed the center 4 bolts to 72 degrees. This was used (except on Corvette aluminum heads, which retained the early bolt pattern) until the 8-bolt Vortec head bolt pattern took over in about 1996. | ||
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| + | The early intake can be made to fit later 72 degree heads by slotting the bolt holes and fabricating (or buying) shims to correct the angles. [http://www.persh.org/pickup/TBI%20Intake%20Manifold.htm '''Using a stock TBI Intake Manifold'''] and [http://www.hotrodders.com/forum/sbc-87-cast-iron-heads-vs-older-intake-55-86-a-175547.html#post1250079 '''this Hotrodders forum thread'''] has the details. | ||
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| + | Neither of the earlier intake bolt patterns are compatible with the Vortec 8-bolt cylinder head, nor can a Voterc intake be used on either of the earlier bolt pattern heads. | ||
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==Types of intakes== | ==Types of intakes== | ||
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