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200 Deck Clearance

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200 Deck Clearance

Post #1 by sarnett346 » Mon Mar 30, 2020 12:42 am

Hello all,

I’m tearing down my inline 200 and I’ve come across something a bit interesting... I measured the deck clearance and came up with .040

As far as I know, stock should be .019, I’m stumped. Pistons are NP275.

Can anyone explain how this may be?


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measuring the i6 Deck accuratly

Post #2 by chad » Mon Mar 30, 2020 12:50 am

"...explain how this may be? ..."
incorrect method of determining? IDK...
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
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Re: 200 Deck Clearance

Post #3 by Econoline » Mon Mar 30, 2020 12:54 am

Aftermarket pistons have lower pin height than stock. They do that to compensate for decking i suppose.
It ain't gonna fix itself

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Re: 200 Deck Clearance

Post #4 by sarnett346 » Mon Mar 30, 2020 9:43 am


I figured that’s what it was, just couldn’t find any measurements online to back it up.

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Re: 200 Deck Clearance

Post #5 by pmuller9 » Mon Mar 30, 2020 10:47 am

The replacement pistons usually have a CD of 1.500" and the stock block if it hasn't been decked can be a few thousands higher than spec.

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Re: 200 Deck Clearance

Post #6 by CZLN6 » Mon Mar 30, 2020 1:09 pm

Howdy Sean:

Did you measure the deck height on this engine before you tore down? Always a good Idea. Stock 200 blocks deck height typically measure around .025". Replacement pistons are down .005" to compensate for machining to true the block.

Adios, David
co-author of the Falcon Performance Handbook

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