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Old 08-05-2006, 06:42 PM
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Rear Main Seal Adapter Kits

any one have any experince with these Moroso Rear Main Seal Adapter Kits (to Put an old-style crankshaft into your new-style engine block.) ? I want to put a older 350 2piece rear main GM steel crank in a 86 up block, it will be a forged bottom end 350, the 1 piece rear main 350 block will be around 450hp. it's a factory roller block 2 bolt main. think the 350 2 bolt main block will be strong enough ?

planing on running this moroso pan http://store.summitracing.com/partde...5&autoview=sku



http://store.summitracing.com/partde...5&autoview=sku

why are these GM ones so much more $ ? http://store.summitracing.com/partde...5&autoview=sku










with this pan http://store.summitracing.com/partde...5&autoview=sku




Mustangsaly

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Old 08-05-2006, 09:12 PM
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I've used a couple of them. They work well the only thing you need to do is trim the underside of the pan gasket to match the large corner radiuses of the adapter. I also put a real thin layer of silicone between the two pieces of the adapter.
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Old 08-05-2006, 11:05 PM
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engineczar, what brand did you use ?



I wonder why the GM adapter costs so much more ?












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Old 08-06-2006, 12:16 AM
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it will be a forged bottom end 350, it's a 1 piece rear main 350 block, and when built it will be around 450hp. it's a factory roller 2 bolt main block , I want to use the 2 bolt main block to run a roller cam, and would like to use it as I already have it. think the (1986 up) 350 2 bolt main block will be strong enough ?





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Old 08-07-2006, 06:52 AM
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The one's I use I get from competition products. They're around $120

As far as a 2 bolt block I feel that it would be fine. Where you get into trouble is with forced induction or big nitrous shots.
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Old 08-07-2006, 12:35 PM
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engineczar thanks, I thought the 2bolt main forged block would be ok at 450 HP N/A.


I'm nearly insane also you think the 1986 up blocks are as strong as the ole high nickel/tin blocks ?




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Old 08-07-2006, 02:23 PM
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Personally I don't think they're as strong but for most N/A non-nitrous applications I think you'd be hard pressed to break one. Anything really aggressive you be looking at a Bowtie or aftermarket block anyway.

I've used a couple of them in circle track cars and haven't had any problems.
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