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Discussion Starter #1
Hi all. I think I have reached to point of trying to tune and correctly jet my 3 Deuce set up on my 347 stroker. Has any one done a SBF with this set up and can give me clue what you are running in both the primary and secondary's. Also, what power valves are you using? I know to set them according to vacuum but where to start? It would be helpful so I don't have to buy 100 jets and support Holley in the manner to which they would like to become accustomed. MANY thanks! Mel
 

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Maybe ZRay will have some advise . Mine is still sitting on the shelf .
 

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Maybe ZRay will have some advise . Mine is still sitting on the shelf .
I have a tripower that I tried to put on my 73 302 in my 65. The setup I put on I thought was clean. But after a host of problems from a needle sticking to the linkages jamming and sending the rpms sky high (really just bad luck). I couldn't get the car to not to run rich with at idle I couldn't get the car to not run rich at idle. So I decided to back off and have my 289 (another engine) rebuilt before I tried again. What I did in the mean time was buy tri power info from HP trends- it was around $20 bucks and it's geared towards FE engines but a lot of the principles still work for a SBF. Also I am going to add an AFR gauge so I can see how it runs at idle/part throttle and wide open. Tuning it should be easier than making run after run replacing jets. Right now I have 52 outer jets and 58 centers with a 6.5 power valve. Its just a start. I won't find out until next season how this will work. Also look on ebay there's guy who sells jets at half the price that most speed shops sell them and he has more variety. I'd be curious on your progress keep us posted :)
 

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Discussion Starter #5
69 RR thanks for the info. I also bought the HP- trends book for $20. AND you are correct it (as well as most of the other sources) deal with the 390 and other BB. I got my set up from a guy who got it from a guy that built a '68 289 but passed away before it got installed or even started. So it is basically new (never had gas in it.) I now have it set up on a '66 289 which is stroked to 347.

He had it set up with the primary (center) with #50 jets and a 6.5 power valve. The secondary's have #55 jets and the power valve blocked. I ran in the cam and now wanted to start tuning. I'm in the same boat as I won't be able to get it out on the road until next spring.

I bought the #40, #50, and #60 jets from ebay just as you noted. I'll let you know what I find you! Please do the same.
Thanks again, Mel
 

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I run a healthy 347 in my '67 Fastback and an original set of 3x2V Holleys. Engine was tuned on a dyno with 59's in the center carb (6.5 PV) and 57's on the end carbs. Intent was to be a little rich vs lean. I ran the motor in the car for the rest of the season that way. The following year, I dropped everything by 2 (57 in center and 55's on the ends) and have run it that way for the past 2 years. I do have a wideband I hope to wire up so I can monitor it a bit better over the entire range.
 

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I would establish a baseline through a Dyno session. Then you know where your AFR is reading. Even similar built engines are different with so many variables.
 

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Discussion Starter #9
Thanks 19Fastback67. The 50 center and 55 ends were TOO lean. I was going to try 60 center and 65 on the ends. If that is too rich I'll try 57 center and 62 0n the ends. I really appreciate you help!
Ken A . . . that is a great thought . . . . but the nearest Dyno is over 1,000 miles away and not connected by road. So that is not possible. It must be nice to have that kind of resource available. thanks for the thought!! Mel
 
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