4.8 to 5.3 conversion cam question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dwcsr · 09-29-2010, 10:59 PM

I have a 4.8 I'm making a 5.3. I have the floating pin flat top pistons, 862 heads and a cam with .467/.479 lift from an LS1. The stock lift is .457/.466.

The questions I have are do I need to use other than the stock 862 valve springs and do I need to be worried about the piston hitting the valve with the flat tops.

My thinking was its almost stock and should be no issue but I'm not up on LSx motors

09-29-2010, 10:59 PM	#1
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,131	4.8 to 5.3 conversion cam question I have a 4.8 I'm making a 5.3. I have the floating pin flat top pistons, 862 heads and a cam with .467/.479 lift from an LS1. The stock lift is .457/.466. The questions I have are do I need to use other than the stock 862 valve springs and do I need to be worried about the piston hitting the valve with the flat tops. My thinking was its almost stock and should be no issue but I'm not up on LSx motors



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