Why not more SBCs in boats?
01-08-2018 | 08:15 AM
#51
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Joined: Jan 2006
Posts: 715
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From: Minneapolis
Let's see if this link works.
https://www.performancetrucks.net/forums/attachments/gm-parts-classifieds-23/52293d1274528758-rebuilt-317-heads-ls6-springs-0-miles-%24400-shipped-100_1339.jpg
the area where the head bolt holes are in the middle is wide open to the lifter valley. This is lower than the outer floor where you would drill for a drain. Again, I'll have another look this evening. making a clear valve cover for this would be easy and informative too.
Jeff
https://www.performancetrucks.net/forums/attachments/gm-parts-classifieds-23/52293d1274528758-rebuilt-317-heads-ls6-springs-0-miles-%24400-shipped-100_1339.jpg
the area where the head bolt holes are in the middle is wide open to the lifter valley. This is lower than the outer floor where you would drill for a drain. Again, I'll have another look this evening. making a clear valve cover for this would be easy and informative too.
Jeff
01-08-2018 | 12:53 PM
#52
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Joined: Sep 2017
Posts: 12
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From: Baton Rouge, LA
I may be able to offer some answers to "go-fast" SBC application.
I have a 1996 Fountain Lightning 35 with 2 Marine Power 6.2 LSA small blocks. The original performance report had the boat at 77 mph at WOT with the 502s. I have been able to achieve 80 mph at WOT with the sbcs. There is room to improve, I haven't tested the boat with minimal fuel yet. Engines have around 80 hours and are mated to Bravo 1s. So far, I have had reliable power, always fill with 93 octane fuel.
I have a 1996 Fountain Lightning 35 with 2 Marine Power 6.2 LSA small blocks. The original performance report had the boat at 77 mph at WOT with the 502s. I have been able to achieve 80 mph at WOT with the sbcs. There is room to improve, I haven't tested the boat with minimal fuel yet. Engines have around 80 hours and are mated to Bravo 1s. So far, I have had reliable power, always fill with 93 octane fuel.
01-08-2018 | 05:56 PM
#55
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Joined: Oct 2016
Posts: 553
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From: Buffalo, NY
Most of the oil should run along bottom side of head toward exhaust side before it fills high enough to spill into head bolt holes. Your just looking to divert some of the oil from going to the valley. You could also plug a couple of the those holes towards the rear, maybe threaded aluminum plug or something that snaps in. Doesn't have to be perfect seal. Just some ideas. Good luck. Nice job by the way looks really clean.
Last edited by veloc410; 09-21-2018 at 11:01 AM.
01-08-2018 | 06:05 PM
#56
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Joined: Jan 2006
Posts: 715
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From: Minneapolis
Yep, just had a look at my heads. Looks like I can make plugs over the head bolt holes and add the external drains. Done deal!!
what shall I obsess over now?
Jeff
what shall I obsess over now?
Jeff
Last edited by hallj; 01-08-2018 at 06:48 PM.
03-05-2018 | 08:21 AM
#57
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You get what you pay for! Merc gets a more reliable and less expensive to build with the BBC in the 400 plus torque.
yes you can charge a SBC to produce the same of a BBC. But you just hadded the cost of a charger and that charger can be added to a BB for the same cost has the SB.
Stroking is good but it also has it limits. Again cost vs gain....
The LS technology is great. But more $$$ and great gain.
It's all about torque for boat. Wile your torque curve climb, you are accelerating. Has soon has it peeks (regardless off your RPM) you are pretty close to top speed.
yes you can charge a SBC to produce the same of a BBC. But you just hadded the cost of a charger and that charger can be added to a BB for the same cost has the SB.
Stroking is good but it also has it limits. Again cost vs gain....
The LS technology is great. But more $$$ and great gain.
It's all about torque for boat. Wile your torque curve climb, you are accelerating. Has soon has it peeks (regardless off your RPM) you are pretty close to top speed.
