Promaxx heads and Valako
#22
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Joined: Feb 2009
Posts: 8,356
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From: NW Michigan
That’s funny. I think about it nonstop. I’m not looking for big numbers rather a good tune. The shop I’m dynoing at is notoriously 5 to 10% lower than others in the area but that’s fine. They should make some good power though considering the combo. 💪🏽👍
edit: It’s been a long time in the making but it’s finally near ready (12m & engines). For the last several years my melon was so messed up I didn’t know whether to buy boat/engine parts, food or ammo. Plus I finance nothing!!! Finally on track…
edit: It’s been a long time in the making but it’s finally near ready (12m & engines). For the last several years my melon was so messed up I didn’t know whether to buy boat/engine parts, food or ammo. Plus I finance nothing!!! Finally on track…
Last edited by getrdunn; 05-23-2022 at 06:10 PM.
#23
What are you using for a FA? Its VERY important to see how it affects your afrs on your cylinders. We dynoed a 540 today with mildly worked 317 promaxes, vic jr, muffled we were at 650+ hp/650 + ft lbs of tq. Using a custom 4150 norm built, afrs were .8 to 1.2 points a parts, no FA. bolted the customers billet oval fa on and here we go again, afrs 3.5 points leanest to richest. Added a 2" TBI pickup truck spacer under it thinking maybe it will let whatever turbulence its causing stabilize, yeah buddy, now # 5 was 15.5-1 at wot. back to drawing board, gotta find a FA for 4150/4500 that does NOT have a square edge inside where air turns to go in the carb!
#27
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Joined: Dec 2010
Posts: 4
Likes: 1
From: Grand Rapids Michigan
That’s funny. I think about it nonstop. I’m not looking for big numbers rather a good tune. The shop I’m dynoing at is notoriously 5 to 10% lower than others in the area but that’s fine. They should make some good power though considering the combo. 💪🏽👍
edit: It’s been a long time in the making but it’s finally near ready (12m & engines). For the last several years my melon was so messed up I didn’t know whether to buy boat/engine parts, food or ammo. Plus I finance nothing!!! Finally on track…
edit: It’s been a long time in the making but it’s finally near ready (12m & engines). For the last several years my melon was so messed up I didn’t know whether to buy boat/engine parts, food or ammo. Plus I finance nothing!!! Finally on track…
#28
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Joined: Feb 2009
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Likes: 1,515
From: NW Michigan
Whoa say what? Damm!!! I do all the majority of the work but will definitely keep that in mind. I practically grew up there living only 2 miles away but Dick and Duane are getting up there in age but great guys and always done great work for me. Sorry that happened to you…. Blow some seals etc?
I’ll have to mention that to them. I see you only have one post. What engine was it?
Last edited by getrdunn; 05-24-2022 at 02:18 PM.
#29
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Joined: Dec 2010
Posts: 4
Likes: 1
From: Grand Rapids Michigan
Whoa say what? Damm!!! I do all the majority of the work but will definitely keep that in mind. I practically grew up there living only 2 miles away but Dick and Duane are getting up there in age but great guys and always done great work for me. Sorry that happened to you…. Blow some seals etc?
I’ll have to mention that to them. I see you only have one post. What engine was it?
I’ll have to mention that to them. I see you only have one post. What engine was it?
Last edited by tpscrtchk; 05-24-2022 at 03:13 PM.






