Glad I stumbled on this thread too... As many here know, I came very close to selling my 67 L78 Chevelle. I was trying to buy a friend of mine's car but the deal fell through so I decided to keep my Chevelle. With that being said, I'm sure glad I kept it! I decided to pull the trigger, after contemplating whether to do so for a year, and do some very light Day 2 mods. I'm sure most purists thing doing something like this to such a perfect stock specimen is blasphemy but it's my car and it's what I like. The headers are NOS Appliance Units which fit without any modifications other than a small dimple to the #3 tube for steering shaft clearance and a mini starter for more starter clearance. I painted them with white stove paint from Dampney Products. This stuff works great, in my experience, much better than white ceramic coating if you follow the instructions. I also needed to change some of the spark plug boots for better header clearance so I decided to use an NOS set of SS550 wires I had in the parts department. The exhaust system was custom made by a local shop, Allied Muffler in Bellflower, CA, and utilized Dynomax Ultraflo Mufflers. I found a beautifully restored set of original American Racing Torq Thrust Ds, also known as "Crows". 15x6 in the front and 15x7 for the rear. The lips are polished and the spokes painted gold, which really makes the gold interior pop! I went with Kelsey Tire Polyglas GTs. E60s up front and G60s out back. I also added a pre '71 Hurst Competition Plus Shifter.... what an improvement over the stock unit! I rejetted the original 3910 Holley with 72 primary jets and 80 secondary jets and a secondary block off. I installed the yellow vacuum diaphragm spring. All in all the car is much more fun to drive! The sound is incredible and way more power! These L78s really benefit from a set of headers and good flowing exhaust
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