388 Slingshot w/ Imco lowers -- Extension boxes?
03-28-2018 | 10:02 AM
#21
Gold Member
Joined: Oct 2000
Posts: 496
Likes: 9
From: Tampa, FL USA
I know it's been a few years, but our 388's haven't changed, nor has our quest to dial them in. I went off the above advice from P-Rob and installed 1" spacers on my 2000 388 with whippled 500's. IMCO standard length lowers. I'm guessing it's the additional bow lift/leverage that helps. No extension boxes. I have both labbed p5-x's and labbed bravo's to try with this combo. Appears I have the factory X of 18.5-18.75". Full cabin. I will try to post some results of the spacers, it makes sense because shorties definitely do not work on our boats.
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10-26-2018 | 07:35 AM
#22
Registered
Joined: Aug 2011
Posts: 526
Likes: 1
From: US of A
Sorry for late response. 1.35 gear.
I am removing my XR Max Machine uppers (only one hour on them now), and going with SCX's. I removed the 1" spacer because it didn't do much of anything. I did repower this year with new engines and larger whipples. In the 850hp range so drives will be a constant stressor from here forward. So I have an awesome set of uppers for sale, and I would like to trade someone their SC shorty lowers for my -0 SC lowers. The SCX is about 1" deeper than an XR.
I am removing my XR Max Machine uppers (only one hour on them now), and going with SCX's. I removed the 1" spacer because it didn't do much of anything. I did repower this year with new engines and larger whipples. In the 850hp range so drives will be a constant stressor from here forward. So I have an awesome set of uppers for sale, and I would like to trade someone their SC shorty lowers for my -0 SC lowers. The SCX is about 1" deeper than an XR.
11-22-2018 | 09:59 PM
#23
Registered
Joined: Sep 2016
Posts: 34
Likes: 7
From: freeburg illinois
Sorry for late response. 1.35 gear.
I am removing my XR Max Machine uppers (only one hour on them now), and going with SCX's. I removed the 1" spacer because it didn't do much of anything. I did repower this year with new engines and larger whipples. In the 850hp range so drives will be a constant stressor from here forward. So I have an awesome set of uppers for sale, and I would like to trade someone their SC shorty lowers for my -0 SC lowers. The SCX is about 1" deeper than an XR.
I am removing my XR Max Machine uppers (only one hour on them now), and going with SCX's. I removed the 1" spacer because it didn't do much of anything. I did repower this year with new engines and larger whipples. In the 850hp range so drives will be a constant stressor from here forward. So I have an awesome set of uppers for sale, and I would like to trade someone their SC shorty lowers for my -0 SC lowers. The SCX is about 1" deeper than an XR.
