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390 1982 cc scoripion. Carb tuining situation Oh my!

390 1982 cc scoripion. Carb tuining situation Oh my!

Old 02-15-2020, 10:19 PM
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Default 390 1982 cc scoripion. Carb tuining situation Oh my!

Hi boater brothers! It's been awhile , the cc is alive and well. Takes me forever to get it al togeather. Wife has me doing insulation, remoulding the kitchen, and bathroom. Uhg! Got the old girl going pretty good. Still can get the carbs right! 13.5 wot, 12.7 mid ,low 10.s at idel Mabey 13.1 wot, sounds excellent , jumps right up on plane, 25 pitch merc plus props. Have a set is 27" to try this spring. What the heck can I do about my 13.5 afr wot??!!
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Old 02-15-2020, 10:36 PM
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Oh yea, I changed the high speed air bleeds down 3 sizes , and removed the 2" carb spacers, that helped, but still to lean WOT as you can see. I want it to be near 11-10.9. As it probley best for this old boat. Any ideas would be greatly apracheaed. Lol how do you Like my spelling ? Also, the 1973 Lyman seabring is purring like a kitten ! Took some deep masaging! Still have less the 150$ into her, will do sea trial this spring.
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Old 02-16-2020, 12:40 AM
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It would help if you said what carbs you have. Also 10.9-11 afr are way rich.
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Old 02-16-2020, 09:01 AM
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Carbs are holly 850's , rebuilt with new jet blocks and boost reference , connected to the intake . B&M 250,s. making 5 psi.
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Old 02-16-2020, 10:47 AM
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A lot of times lean @ WOT can be cured with the power valves, you need to make sure that they are not closed, blowers like those create a bunch of vacuum at the carb that can close the power valve when you need it the most
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Old 02-16-2020, 11:40 AM
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The carbs are boost referenced, to the intake, could there still be a problem with them?
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Old 02-16-2020, 11:52 AM
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Jets front- .096. Rear-106 pv- front 4.5 Squiter-.035 Pv rear- na. Idle-.063 front and rear As stated earlyer, dropped high speed air bleeds 3 sizes, they are now .029
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Old 02-16-2020, 11:56 AM
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Im working with a shop that did the modifications , they do mainly drag racing cars. Im sure they will keep helping me. Any one have any suggestions that may help steer us in the right direction?
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Old 02-16-2020, 11:59 AM
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Thanks again, everyone on here! Up to this point, all weve done is test rides. Looking forward to getting the afrs right , then having some fun!
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Old 02-16-2020, 12:11 PM
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This thread is a continuation of the thread , mabey Im learning started by scscoripion. Thats me. Stu
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