crank question
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Junior User
Joined: Sep 2008
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crank question
I was reading the thread about balancer and fly wheel questions and it got me thinking. I have a 71 351 block and I recently ordered a new Scat crank. I know my block has a two piece rear main seal but when I ordered the crank there wasnt any option for 1 or 2 piece seal applications. So my question is; are the cranks any different between the 1 or 2 piece main seal applications or is it just the blocks that are different and require different seals. And if the cranks are different, how can I tell by looking if I got the right one?
Elder User
Joined: Nov 2008
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From: houston
I just went out to the garage and pulled the rear main off of a 84 5.0 and the back flange was straight across where the one piece seal fits.The one piece seal also fit on my `69 302 crank , but the `69 crank has a lip on the inside of the flange and doesn`t look like it would fit in the 5.0 block unless the lip was machined off.So I`m thinkin` thats why they advertise some cranks to fit either a one or two piece seal block,they just remove that lip.As long as you use the 28 oz damper/flywheel w/older 302 cranks,and 50oz w/newer 5.0 cranks you can use either crank in either block.All 351W`s are 28 oz 
Someone correct me if I`m wrong! p.s. ditto for neautral balance
Someone correct me if I`m wrong! p.s. ditto for neautral balance
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Junior User
Joined: Sep 2008
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I talked to the Scat rep. today and he siad that the crank I bought can be used with a one piece or two piece seal. He siad they make them that way so they can be used an any 351 block. So I guess Im good to go.
