The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - camshaft- head- bbc ??????

nxtruck · 04-08-2008, 08:19 PM

There's no hard and fast answer to this. First, you have to determine how much lift you will have. Then, once this figure is known, you check the distance between the retainer and the top of the guide with the valve closed ( your installed height ) and subtract your gross lift figure from your installed height. Hopefully, you'll end up with at least .060 or so extra clearance. If not, then you know the guides will have to be machined.
Sorry for not being more specific, but there's no way of knowing for sure without taking these measurements.

04-08-2008, 08:19 PM	#5
nxtruck Registered User Join Date: Jun 2006 Location: Jackson, Mo. Posts: 607	Re: camshaft- head- bbc ?????? There's no hard and fast answer to this. First, you have to determine how much lift you will have. Then, once this figure is known, you check the distance between the retainer and the top of the guide with the valve closed ( your installed height ) and subtract your gross lift figure from your installed height. Hopefully, you'll end up with at least .060 or so extra clearance. If not, then you know the guides will have to be machined. Sorry for not being more specific, but there's no way of knowing for sure without taking these measurements.