SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 75Hustler on February 26, 2012, 04:57:34 PM
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Hi everyone newbie to the forum and looking forward to being an active part of this community! I am also new to the jet boating world and very excited to get mine going!
I recently purchased a 23' 1975 Hustler with a 455 oldsmobile engine and I have a few questions, hope someone can help me out here...
1. I am installing Hardin Log Manifolds and was wondering if they directly bolt to the block or is there a gasket needed? Checked out the Hardin marine website and cannot locate a gasket that matches my bolt pattern, so now I am a bit confused. I would think there would be a gasket between the manifold and block??
2. Can automotive parts be used on this engine or should i stick with only marine parts? Reason I ask is automotive parts are much cheaper than the marine parts. Not sure if it matters but I will be using on lakes and rivers only, NO ocean.
Thanks :)
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Hi everyone newbie to the forum and looking forward to being an active part of this community! I am also new to the jet boating world and very excited to get mine going!
I recently purchased a 23' 1975 Hustler with a 455 oldsmobile engine and I have a few questions, hope someone can help me out here...
1. I am installing Hardin Log Manifolds and was wondering if they directly bolt to the block or is there a gasket needed? Checked out the Hardin marine website and cannot locate a gasket that matches my bolt pattern, so now I am a bit confused. I would think there would be a gasket between the manifold and block??
IMHO I have always made sure the gasket surface on the manifold is flat and used either high temp silicone (like Ultra Copper) or simply high temp never seize. The weak link is the center Siamesed cylinders. At the same time if you want to run a gasket I would recommend solid copper.
2. Can automotive parts be used on this engine or should i stick with only marine parts? Reason I ask is automotive parts are much cheaper than the marine parts. Not sure if it matters but I will be using on lakes and rivers only, NO ocean. What parts?
Thanks :)
GT
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GT
any idea where they may carry a gasket that would fit the HARDIN WET LOG MANIFOLD OLDS 455? Have been searching like a mad man but cannot seem to find one that will fit that bolt pattern, if not I may just have to go with the high temp silicone as you suggested.
As for parts... Carb, Distributor, plugs, plug wires. All external parts nothing internal.
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Silicone.
Sent from my ADR6400L using Tapatalk
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If the engine is inside of an enclosed area you have to use coast guard approved "marine" parts for a few specific items (Distributor, carb, fuel pump, alternator, starter and an approved spark arrestor). If the engine is open you can run automotive parts but it is recommended to still use marine parts when you can.
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any idea where they may carry a gasket that would fit the HARDIN WET LOG MANIFOLD OLDS 455? Have been searching like a mad man but cannot seem to find one that will fit that bolt pattern, if not I may just have to go with the high temp silicone as you suggested.
As for parts... Carb, Distributor, plugs, plug wires. All external parts nothing internal.
Get em virtually anywhere.... These are pretty inexpensive... :sly:
http://www.scegaskets.com/Oldsmobile/350-455-V8/Exhaust-Header-Gaskets/SCE-Pro-Copper-Header-p6630115.html (http://www.scegaskets.com/Oldsmobile/350-455-V8/Exhaust-Header-Gaskets/SCE-Pro-Copper-Header-p6630115.html)
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Thanks for the help guys, think I will stick with marine parts and GT thanks for that link exactly what I was looking for! :thumbup:
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Welcome to SCJB ;D
Now post some pics of the new float ;)
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Dont use a solid copper gasket . trust me been there done that. make sure the head is flat and the manifold is flat! i got away with useing felpro automotive exhaust manifold gasket with the RTV high temp sealer.copper color. good luck.
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Dont use a solid copper gasket . trust me been there done that. make sure the head is flat and the manifold is flat! i got away with useing felpro automotive exhaust manifold gasket with the RTV high temp sealer.copper color. good luck.
What problems did you have with copper?
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What problems did you have with copper?
X2 ???
Had many success stories from using a solid gasket. :-\
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copper is also GREAT at conducting heat and logs are a great way of getting rid of heat...
ended up with copper gaskets here, dont forget to port match em.
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copper is also GREAT at conducting heat and logs are a great way of getting rid of heat...
ended up with copper gaskets here, dont forget to port match em.
Ok so I went ahead and ordered the copper gaskets here... http://www.scegaskets.com/Oldsmobile/350-455-V8/Exhaust-Header-Gaskets/SCE-Pro-Copper-Header-p6630115.html (http://www.scegaskets.com/Oldsmobile/350-455-V8/Exhaust-Header-Gaskets/SCE-Pro-Copper-Header-p6630115.html)
They are a soft copper so I am assuming if installed correctly the copper should form to any imperfections at the seal if any. Now when I removed the LOG MANIFOLDS there was no gasket, nor was there any sealant so now the question is install the gaskets or just go with the High Temp sealer???? I don't want to run into any issues with the copper gaskets later on down the road creating to much heat at the seal :o
I guess it would of helped if I added why I was thinking about adding the gasket... When engine was running it was pushing a bit of air out the top of the manifold. Could have simply just needed a good tightening on the bolts, however I figured I would just remove it and see how the surfaces looked both on the manifold and the block, to me looked fine.
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Ok so I went ahead and ordered the copper gaskets here... http://www.scegaskets.com/Oldsmobile/350-455-V8/Exhaust-Header-Gaskets/SCE-Pro-Copper-Header-p6630115.html (http://www.scegaskets.com/Oldsmobile/350-455-V8/Exhaust-Header-Gaskets/SCE-Pro-Copper-Header-p6630115.html)
They are a soft copper so I am assuming if installed correctly the copper should form to any imperfections at the seal if any. Now when I removed the LOG MANIFOLDS there was no gasket, nor was there any sealant so now the question is install the gaskets or just go with the High Temp sealer???? I don't want to run into any issues with the copper gaskets later on down the road creating to much heat at the seal :o
I guess it would of helped if I added why I was thinking about adding the gasket... When engine was running it was pushing a bit of air out the top of the manifold. Could have simply just needed a good tightening on the bolts, however I figured I would just remove it and see how the surfaces looked both on the manifold and the block, to me looked fine.
the copper gasket should have a little "ridge" that helps seal any imperfections. you shouldnt need to run any sealant just make sure they're torqued correctly. according to http://www.442.com/tech/torque.html (http://www.442.com/tech/torque.html) it looks like 25 ft/lbs.
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Ok so I went ahead and ordered the copper gaskets here... http://www.scegaskets.com/Oldsmobile/350-455-V8/Exhaust-Header-Gaskets/SCE-Pro-Copper-Header-p6630115.html (http://www.scegaskets.com/Oldsmobile/350-455-V8/Exhaust-Header-Gaskets/SCE-Pro-Copper-Header-p6630115.html)
They are a soft copper so I am assuming if installed correctly the copper should form to any imperfections at the seal if any. Now when I removed the LOG MANIFOLDS there was no gasket, nor was there any sealant so now the question is install the gaskets or just go with the High Temp sealer???? I don't want to run into any issues with the copper gaskets later on down the road creating to much heat at the seal :o
I guess it would of helped if I added why I was thinking about adding the gasket... When engine was running it was pushing a bit of air out the top of the manifold. Could have simply just needed a good tightening on the bolts, however I figured I would just remove it and see how the surfaces looked both on the manifold and the block, to me looked fine.
See the link for something to consider if you think you might have the boat for a while. The siamese ports on Olds logs are notorious for warping and eventually leaking. I eventually started omitting the center bolt: My theory was that by not pulling the top of the log flange tight against the head port, it helped keep some heat from the head port from excessively heating up the top part of the log flange. I think this allowed the whole log flange to run at more of the same temperature, and helped avoid the large delta-T's (across the flange) that cause warping. And per the below, I never used gaskets. High temp. RTV only.
<http://www.socaljetboats.com/engine-mechanical-electrical/olds-log-fix/msg150026/#msg150026>
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the copper gasket should have a little "ridge" that helps seal any imperfections. you shouldnt need to run any sealant just make sure they're torqued correctly. according to http://www.442.com/tech/torque.html (http://www.442.com/tech/torque.html) it looks like 25 ft/lbs.
ka0tyk thanks a bunch for that link! :thumbup:
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when i first bought my kona it had the logs and when i removed them mine had a gasket on there. looked like just a plain jane automotive gasket. never leaked or anything and this gasket was shot when i took it apart. it was coming off in pieces. good luck with your boat
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Always run gaskets and i may have a set of olds over transom bassetts for sale soon if interested let me know 500 for the headers and t injector lines if i sell