353 Ext. Boxes & 502's w/ Shorty lowers Qstn.
05-12-2008 | 09:50 AM
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353 Ext. Boxes & 502's w/ Shorty lowers Qstn.
Hello Everyone,
Just bought a 353 w/ 502's and stelling ext. boxes. My mechanic was looking at the X-Dimension and said that I could probably gain alot with the addition of Shorty lower units. He said that with the standard lowers that they looked to be pretty far down because Formula mounted the Ext. Boxes right where normal bravo's would be instead of raising them up. Has anyone switched over and is it a big gain in performance?
Just bought a 353 w/ 502's and stelling ext. boxes. My mechanic was looking at the X-Dimension and said that I could probably gain alot with the addition of Shorty lower units. He said that with the standard lowers that they looked to be pretty far down because Formula mounted the Ext. Boxes right where normal bravo's would be instead of raising them up. Has anyone switched over and is it a big gain in performance?
05-14-2008 | 09:25 PM
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From: Alexandria Bay, NY 1000 Islands
05-15-2008 | 09:45 AM
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From: Maryland
Unless I'm mistaken, the Stellings boxes can be raised and lowered on the transom, because of the internal CV joint driveshaft in the box. Maybe there isn't sufficient room under the bottom of the platform to raise the box anymore, in which case the shorty lower would be your only alternative.
05-16-2008 | 01:53 AM
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From: Gelsenkirchen, Germany
we use ITS and shorties on our 353
ITS is alrady installed at higher X Dimension than stock drives
gained 3 MPH with shorties - most important - we use a 15 1/4 Maximus prop - Boat did not plane easyly with a 15 5/8 prop
ITS is alrady installed at higher X Dimension than stock drives
gained 3 MPH with shorties - most important - we use a 15 1/4 Maximus prop - Boat did not plane easyly with a 15 5/8 prop
05-16-2008 | 03:27 PM
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Thank you all for the replies, my mechanic thought it would gain me approx. 5mph. I have plenty of room to move them up under the platform but I thought they were thru-bolted in the bravo pre-cut holes. Does anyone know if the Stellings can be adjusted up and down?
05-20-2008 | 12:32 AM
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From: tn
Stellings boxes come in 2 flavors.
1) One set of mounting holes. You have to redrill to move it.
2) Three sets of mounting holes - neutral, plus 1, minus 1. Just move the box, as the Ujoints will easily accomodate the difference.
If you have the one-hole boxes, you can have the other holes added. Or you can send em to me and I can add them.
1 inch isn't a lot of range, though.
If you want to, you can swap to Imco boxes, and use the +3 boxes. You have to raise the motors, but it is just a matter of spacers under the FRONT motor mounts, since the rear mounts are part of the transom plate. Tailpipe mods also to use the same transom holes.
I happen to have some +3 boxes if somebody were to want them...
mc
1) One set of mounting holes. You have to redrill to move it.
2) Three sets of mounting holes - neutral, plus 1, minus 1. Just move the box, as the Ujoints will easily accomodate the difference.
If you have the one-hole boxes, you can have the other holes added. Or you can send em to me and I can add them.
1 inch isn't a lot of range, though.
If you want to, you can swap to Imco boxes, and use the +3 boxes. You have to raise the motors, but it is just a matter of spacers under the FRONT motor mounts, since the rear mounts are part of the transom plate. Tailpipe mods also to use the same transom holes.
I happen to have some +3 boxes if somebody were to want them...
mc
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