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Old 05-11-2004, 08:32 AM
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Seals

What is the deal on the new 400 cranks wanting two piece seals vs single seal? I want to build a new 383 and plan to purchase one of the fancy new 400 cranks. But it says that my block has to use two piece rear seals. Any of you gurus? My understanding is that the old blocks used the single piece and the new blocks use the two piece. But that would make it a block issue rather than a crank issue. HELP..

Thanks

hr41pearl

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Old 05-11-2004, 08:35 AM
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thom, you have it backwards, old SBC/BBC use a 2 piece rear seal, newer models use a one piece seal. You can use a seal adapter to convert a late model block to an early model block..I know because we make the adapters.

Chris
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Old 05-11-2004, 08:51 AM
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Seals

Thanks Chris. Yes, I had it backwards. But why do the crank people want you to run an old block for this project? IE two piece seals? The seal galley is the same size, no?

You say that you make the adapters? By you, you mean the company you own/work for? Who do you distribute through? My block is a 84 truck 350/4 bolt. I think. I should write the cast down. What about the front seal? Will I have any problems there?

Thanks for the help.

hr41pearl
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Old 05-11-2004, 09:10 AM
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Re: Seals

Quote:
Originally posted by Thom Laybourne
Thanks Chris. Yes, I had it backwards. But why do the crank people want you to run an old block for this project?

IE two piece seals?
The original or first stroker cranks were based on the old 2 piece design. Since the larger journal stuff has been around longer. . .IE more blocks to fit. . .the 2 piece was the best choice. The new 1 piece blocks are not as many but with the shortage of cores anymore, they have gotten more popular. My boss, Mr. Stef, designed the adapter to convert a 1 piece seal block to a 2 piece. Since then, crank mfgs. have made the 1 piece seal cranks to fit the late model blocks



The seal galley is the same size, no? The OD is different, but yes the ID is the same.

You say that you make the adapters? By you, you mean the company you own/work for?

Correct, Stef's Performance

Who do you distribute through?

Several WD's, Summit/Jegs, and other wholesalers. On the board it would be Tom's Perf., Rogers Perf. and K-Star.

My block is a 84 truck 350/4 bolt. I think. I should write the cast down. What about the front seal? Will I have any problems there?

No front seal is the same size.

Thanks for the help.

hr41pearl
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Old 05-11-2004, 09:26 AM
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Double checked

Thanks again for the assistance. I have the motor in the bed of the truck and the numbers are 14010207. That should make it a 1985 Truck motor with a two piece seal. I was thinking that the change came in late 70's. The net says it was 86.

Any opinions on 400 cranks? Cost / ability? Eagle 4340 / Scatt?

Hope to strip this thing tonight and have it at the machinist by late Wednesday.

hr41pearl
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Old 05-11-2004, 09:52 AM
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A good crank for the budget minded would be the Eagle cast steel, internally balanced, stroker crank. It is the 400 (3.750") stroke with the 350 main size and it's for the 2 piece rear main seal block. I sell it for around 240 bucks. I think the Eagle cranks are better cranks than the Scat or Ohio brands.

Eagle also has a 4130 forged crank, internally balanced for the same engine that I sell for 535 bucks and the 4340 internally balanced for 670 bucks. Both of these are cross-drilled and have .125" rod and main journal radii.


tom
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Old 05-11-2004, 10:26 AM
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Many Thanks

Many thanks to both of you.
Tom, I will give my local MS guy first crack at the parts. But your price is very good. Do you sell direct?
Hope to have this thing back by Tuesday next and get started with assembly.

hr41pearl
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Old 05-11-2004, 12:46 PM
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By all means give your MS guy the first chance. If you have any questions or problems, PM me and I will give you more details.

tom
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