|
80’s 24’7” Refit Suggestions Needed
I recently purchased a 24’7” Superboat knowing the engine took a bath and needed to be rebuilt. I have always had cats and know not a lot about good set up on these small V’s. The boat must have been the only Superboat in Havasu and surprisingly is all dry. I boat at Lake Cumberland and want to build something that is reliable safe and run into the 70’s. I also plan to use it to ski the Catalina Ski Race in 2026. I have stripped the boat and am planning what to do to optimize the set up with a reasonable budget.
The boat has a 454 4 bolt main with 990 iron heads flat tap hyd cam. I have already taken the block to the machine shop and they are going to bore 30 over, line home, new cam bearings etc..I am going to use the original GM forged crank and dimple rods. I am going to use Promaxx 317 rect heads with 119cc chambers, pac springs, inconel exh valves, wiseco pistons that will give me about 9.7:1 CR with a standard thickness head gasket. I’m going with a Edelbrock Airgap intake and 850 carb. The boat had an electric shift Merctrans 2 which the tail stock is leaking. A TRS drive with a nose cone. The drive seems good, but I am going to pressure test it. The transom assembly looks good and tight. I want to shoot new gelcoat on the transom while I’m at it. The boat had the cheesy bennet tabs. Tenative plan. Hydraulic dual ram steering 280 Kplanes Borg Warner transmission change.(I am going down a bit of a rabbit hole with this because I am going to have to move the engine forward about 6 inches find a new drive yoke, new shifter) I have managed to gather a bunch of used parts to lower the cost of the project. I like the old graphics and want to keep the nostalgic look. I know that the transom is going to be full of hardware and the steering rams may restrict the location of the tabs. I don’t know if moving the engine forward would adversely affect the CG? I know it wouldn’t be good for top speed but may help it to fly more level. Please let me know your suggestions. https://cimg7.ibsrv.net/gimg/www.off...500d923d8b.png https://cimg2.ibsrv.net/gimg/www.off...3081e5d1c.jpeg https://cimg6.ibsrv.net/gimg/www.off...3bf05871a.jpeg https://cimg1.ibsrv.net/gimg/www.off...6429fdba8c.png |
Congrats on the purchase. It looks good in the pics. I just moved from a twin outboard Talon cat to a 23' Kryptonite with 300XS. I
look forward to following your refresh of the boat. I don't think you will have any problems getting answers on setup as those hulls have been around a long time. Keep us posted on your progress and congrats again! |
Boat needs real external steering . All the power in the world won’t help if you can’t drive it.
|
I have twin ram Imco hydraulic steering ready to go except I need one of their back cap mounts, Thanks for the suggestion. I have some 280kplanes as well. I am going to have to fill in some screw holes and regel the transom.
The machine shop is about done with the block and the new Promaxx 317 heads are arriving tomorrow. I tore into the 71-c velvet drive this weekend. The used unit I bought had some water in it and it is marginally rebuildable. I was lucky enough to find a 72 that was working but had a seal leaking. So it looks like I will rebuilding that one. I had never opened a velvet drive up. Wow beefy units. Much better than the Bravos cone clutch but they add a lot of weight and have to have a lot of parasitic power loss. https://cimg5.ibsrv.net/gimg/www.off...b19622e3f1.png |
|
The 71s are not the same length as the 72s
|
K planes for superboat
Originally Posted by z.zuperboat
(Post 4921172)
The 71s are not the same length as the 72s
|
Sliding the engine forward doesn’t sound like the best idea for top speed but the aluminum heads could make it a wash.
|
https://cimg1.ibsrv.net/gimg/www.off...0e8bb8366.jpeg
https://cimg2.ibsrv.net/gimg/www.off...68f169838.jpeg https://cimg3.ibsrv.net/gimg/www.off...b4bbbb09c.jpeg https://cimg4.ibsrv.net/gimg/www.off...f607e6d22.jpeg Making progress. i have all the holes in the bilge area filled and it sanded ready for new coat of gelcoat. i dynoed the engine and it’s ready to go. I got a mock up block and I’m fabricating the motor mounts and getting them installed. As you can see I ditched the TRS stuff for the Konrad drive with a Huber 1050 drive. I refinished some 280 K planes and have IMCO dual ram steering ready to go. |
Are you keeping the Imco powerflows?......love the old skool 24' SB's ~ Good luck !
|
| All times are GMT -5. The time now is 12:52 AM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.