- Joined
- Feb 16, 2011
- Messages
- 3,495
- Reaction score
- 11
- Location
- Monument, Colorado
- My Car
- 1972 Sport Roof
So, the 429 is topped by an Autolite 4300 carb. At sea level it ran great, up here at 7,000+ feet it runs rich and performance sucks (but the engine sounds great). I have a couple questions:
1) I've been told the carb needs to be rejetted for high altitude. I know I have to retune it, but my experience with carbs is minimal. I've got a bunch of books I've been reading, but they are lean on 4300 information. How tough would doing this stuff be?
2) Should I look at investing in a better carb? I've read very mixed reviews on the 4300 (it was rebuilt ~10 or 12 years ago and only has about 50 miles on the rebuild).
3) For the 429, does the 4300 flow enough or should I look at a carb that flows better?
Note: I'm not looking at racing, just cruising. Also, MPG's are good!
1) I've been told the carb needs to be rejetted for high altitude. I know I have to retune it, but my experience with carbs is minimal. I've got a bunch of books I've been reading, but they are lean on 4300 information. How tough would doing this stuff be?
2) Should I look at investing in a better carb? I've read very mixed reviews on the 4300 (it was rebuilt ~10 or 12 years ago and only has about 50 miles on the rebuild).
3) For the 429, does the 4300 flow enough or should I look at a carb that flows better?
Note: I'm not looking at racing, just cruising. Also, MPG's are good!