Thread: 500 Caddy/G Body Swap
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09-28-2010 07:32 PM #11
CHR Member
- Join Date
- Mar 2003
- Location
- SW Arizona
- Car Year, Make, Model: 68 Ply Valiant, 83 El Camino
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- 3,872
Barb, if it is this hole it is for vacuum. The manifold will take a wide range of carburators and not all will have all the vacuum ports.
Actually a couple of the ports you mentioned on the Rochester were probably for the choke pull offs. In many cases (like my stock manifold) there is an additional vacuum T located in the rear runner for a vacuuum sourse for the AC doors and cruise control.
To answer your question it's fine to plug the hole if you're not going to use it.I've NEVER seen a car come from the factory that couldn't be improved..... 
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