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The replacement carb I took off had 70 jets. The original #3367 I put on has the correct 65 jets. Should that have any effect on the way the car performs?
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Re: '66 #3367 JET SIZE
Improved fuel economyBill Clupper #618 -
Re: '66 #3367 JET SIZE
Depends on what model/size carb you took off. Many Holleys had #70 jets as standard issue. May be a difference in fuel economy, may not. When I ran a carb like yours, I found #67 jets gave slightly more power than #65. Don't know about milage. I'd guess bigger jets than stock in almost any Holley would decrease mileage.Comment
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Re: '66 #3367 JET SIZE
the correct jet for a 3367 is a #65 and the correct secondary plate is a -22Comment
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Re: '66 #3367 JET SIZE
The service replacement carb I removed was a #3605(AIR) with 67 jets, 4920 front metering block and 22 secondary metering plate and the extra vacuum openings blocked off. So far, I feel like it performed better than the original #3367 I put on with correct 65 jets, and 4943 front metering block.(I'll check the # on the secondary metering plate). Meanwhile, can I check the opening of the secondaries while the car is stationary?Comment
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checking the secondary for WOT opening
to check the secondary opening put a small dab of grease on the throttle base plate where the secondary wide open throttle stop hits the base plate. this is under the vacuum secondary diaphram housing. go for a full throttle run and see if the dab of grease has a mark in it,if not the secondary is not opening fullyComment
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Re: '66 #3367 JET SIZE
Mike,
I was mistaken, the jets were 67 that were in the replacement #3605 carb on my car. Could you actually feel the difference in performance between 65 and 67 jets? I'd like the car to run as it did before I switched carbs, so maybe I'll put the jets, metering block and secondary plate from the other carb in my original. I can always switch back if I'm not happy with the results. The original carb isn't leaking anywhere(now)which was my real concern.Comment
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BY THE WAY, I DON'T HAVE AN A.I.R CAR *NM*
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Re: '66 #3367 JET SIZE
Optimum jet size in any given carb can can vary due to variables in pressure, temp, humidity, exhaust design, etc. In my circumstances, the #67 size gave more SOTP than the #65. If you want to play with it, go ahead and see if you can feel any difference. I believe I would just change the primary jets first and then go to the secondary plate next. They may even be the same. I see no need to change your primary metering block.Comment
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jet size
most carbs are jetted for sea level and you need to reduce the jet AREA by 2% for every 1500 feet above sea level.Comment
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Re: jet size
Well, what would you do if you stayed at sea level and the temp dropped 40 degrees and you decided to open your headers? Or maybe add a little gasahol?Comment
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Re: jet size
Well, what would you do if you stayed at sea level and the temp dropped 40 degrees and you decided to open your headers? Or maybe add a little gasahol?
Now read your civilian mail. I have a question on a different subject.Comment
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Re: jet size
if you plugs are brown you are too rich,cigarette ash white is the correct color. i always used a new plug to compare and if it was just slightly darker white than the new one we were good to go. the best thing ever invented was the self contained EGT gauge with a memory that held the highest temp reading. i still have mine somewhere.Comment
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Re: jet size
???????????????? you talking to me????????????Comment
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Yes! *NM*
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