T
tbbob
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- Last seen
- Joined
- Dec 12, 2017
- Thunderbird Year
- 1966
At about 100K the 390 in my '66 was feeling quite tired. I had the engine completely rebuilt but doing so didn't really make a noticable difference (actually wondering if the engine shop even did the rebuild or simply repainted it - rather poorly). So I'm looking for pointers on the easiest way to increase the engine's HP.