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Old 07-10-2010, 05:14 PM
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New chrome moly crank hitting piston skirts

I had a 350 sbc bored 30 over stock style valve relief piston Crank is worn end play worn thrust bearing so I bought a CAT performance chrome moly whatever 3.480 3.750 rod suppose to work deal $400. I put the crank in and it is hitting a few piston skirts CAN I get a piston with smaller skirts ?.. Or am I *********** and have to buy new rods machine work etc. PLEASE HELP!!! This motor isa $500 over buget I appreciate it.crank is model cks-350ba

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Old 07-10-2010, 05:31 PM
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Quote:
Originally Posted by ghomer
I had a 350 sbc bored 30 over stock style valve relief piston Crank is worn end play worn thrust bearing so I bought a CAT performance chrome moly whatever 3.480 3.750 rod suppose to work deal $400. I put the crank in and it is hitting a few piston skirts CAN I get a piston with smaller skirts ?.. Or am I *********** and have to buy new rods machine work etc. PLEASE HELP!!! This motor isa $500 over buget I appreciate it.crank is model cks-350ba
Their web site shows this as a 3.50" stroke crank(CKS-L350ba was only # I could find) which is .020" longer stroke than stock. That shouldn't cause a problem, but CAT has a poor rep for quality when it comes to counterwieght size and placement from what I have heard. Made in CHINA.

What piston are you using?

You could always machine the skirts to clear if necessary, I've done it before on other engines. Just be sure it will also clear the bottom of the pin boss in the piston before you get too far into the cutting the pistons scenario, be a time waster to cut the skirts and then not clear the pin boss.
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Old 07-10-2010, 05:55 PM
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You need something like H345 piston. Short skirts..
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Old 07-10-2010, 05:56 PM
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thanx for reply...

Crank is not L350BA it is CKS-350BA 3.480S , 5.700R int/b-1 855GM c/0.2rs 68-88 ? whatever this means I know it is standard stroke 5.7 rod thats All I know... They said it wasnt a stroker..bt Im thinkin it is.. Can I not just buy new pistons from summmit with smaller skirts ?... The skirts on these GM factor 30 over pistons or big and hang downfar.
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Old 07-10-2010, 05:57 PM
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BOB that is what I was thinkin THANK YOU..

If this works I am sending my wife up to well you know.. LOL I hope this isnt a stroker crank though,...
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Old 07-10-2010, 06:07 PM
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k looked up the piston says its about $15 per piston

Wil these work okay with the 64cc vortecs I plan to run high octane 94 gas I cant find anything about this crank being a stroker.. I called the company no reply LOL imagine that.. BOB I seen a site you posted Flatlander good site!! nice prices..I Love this site it tells newbies like me the right direction Ive learned a lot about modifying engines in the past month I shoulda asked about this crank here before I bought the crank but hell $300 CDN new in box rang my bell. If you think 64 cc and this piston will sove some skirt issue due to the shorter 345 Im gonna try it..
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