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"/> | ||
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| + | ==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 (same with using the later intake (both TBI and TPI intakes from F-bodies (Camaro/Firebird) with the early cylinder heads and 87-91 Corvette aluminum heads). [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 (with the exception of some performance intake manifolds e.g. Edelbrock Victor Jr. if used with the Vortec head after redrilling - some aftermarket Vortec heads will have a dual bolt pattern which do not support the traditional SBC intake manifold), nor can a Vortec intake be used on either of the earlier bolt pattern heads. | ||
==Types of intakes== | ==Types of intakes== | ||
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*[http://www.hotrodders.com/forum/carb-spacer-163755.html Carb spacer] thread on Hotrodders forum. | *[http://www.hotrodders.com/forum/carb-spacer-163755.html Carb spacer] thread on Hotrodders forum. | ||
*[http://cms.nhra.com/dragster/1999/issue05/racing_technology.html Racing Technology Tuning with carburetor spacers] from NHRA.com | *[http://cms.nhra.com/dragster/1999/issue05/racing_technology.html Racing Technology Tuning with carburetor spacers] from NHRA.com | ||
| + | * Here's a dyno flog by Car Craft involving 23 different intake manifolds..... | ||
| + | *[http://www.carcraft.com/techarticles/1309_dual_plane_intake_manifold_comparisons/viewall.html] | ||
==Marine intakes== | ==Marine intakes== | ||
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[[File:VORTEC INTAKE BOLTS.jpg|thumb|left|]] <br style="clear:both"/> | [[File:VORTEC INTAKE BOLTS.jpg|thumb|left|]] <br style="clear:both"/> | ||
| − | + | ==Using early intake on later (non Vortec) heads== | |
On the 1986-back heads and intakes, the center four bolts were the same angle as the other bolts. 1987-up use a different 72 degree angle except for Corvette aluminum heads. To compensate, spacer/washers can be made or [http://www.holley.com/90748.asp '''bought'''] to allow the intake to fit. | On the 1986-back heads and intakes, the center four bolts were the same angle as the other bolts. 1987-up use a different 72 degree angle except for Corvette aluminum heads. To compensate, spacer/washers can be made or [http://www.holley.com/90748.asp '''bought'''] to allow the intake to fit. | ||
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