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MMWS/CROSS PERFORMANCE MS661 TOP END

Mastermind

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So far.....knock on wood......this top end is good. I still have to set it up and check compression, squish, etc. I've checked the timing numbers and they are dead on what I asked for. Port shapes ain't bad either. The intake could be better.......but I've seen some pretty odd stuff on OEM jugs too.

OK......here's some pictures. OEM on the left.

IMG_3746.JPG IMG_3757.JPG IMG_3758.JPG IMG_3759.JPG
 

paragonbuilder

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Very cool. I thought they were making a 660 top end?
Are you going to try it bone stock first?


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Mastermind

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is the 661 the only cylinder they have plans on doing this for ?

There is an 066 top end too. Should be up for sale in October on HL Supply's site.

Very cool. I thought they were making a 660 top end?
Are you going to try it bone stock first?


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The 066 top end is in production already.

Yes.......I'm not gonna touch this one.
 

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Is this the first aftermarket performance topend available? Other than bigbores?


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Cross Performance sells a 084 top end that is an improved casting too. Then the MMWS 066 top end is a performance casting......and now this one.
 

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How many different ones are you planning on offering? Pretty damn neat really.

Not me.......this is our host's gig. HL Supply just hired me to do the prototype. I'm not sure how many different ones Bruce is gonna do. It probably depends on how well they sell.

With a gasket?

Yes .030" with a base gasket.

I just checked compression.......I had too. 160psi.
 
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