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One key to excellent flow is accurately positioning the valve relative to the seat in the cylinder head. This assumes a very tight valve guide to valve stem clearance. Without this, you can expect the best valve job to be pounded into uselessness in a very short time. It's also important to note that one way to maintain decent
Between me and friends who've had valve guides replaced, there always seems to be more slop in them with the new parts. new guides(cast iron or bronze) tend to be made with .001" extra clearance. sbc stock spec is .0017-.0027(spec for clearance is the same for intake 89 Suburban 4x4 TBI 350.
1 Jul 1996 or there is too much clearance between the guide and valve stem, the engine will use oil. This applies to both intake and exhaust guides. Though oil consumption can be more of a problem on the intake side because of constant exposure to engine vacuum, oil can also be pulled down the exhaust guides
31 Oct 2014
The L31 heads from the late-model 350 Vortec engine, introduced early in 1995, is the other type of cylinder head you need to look for on the used market. This is probably the Ideally, the valve-stem-to-guide clearances need to be about 0.0015 inch on the intake and 0.002 inch for the exhaust clearance. With older used
9 Jul 2013
I had my heads redone recently and was checking a few things out. I was checking the amount of movement that the valve made in the guide. I used a magnetic base and dial indicator to check the total movement on average it came up 0.100 on exhaust and intake. The valve clearance was measured with
10 Oct 2006 Step two is checking valve-guide clearance. Alvarez began by checking the guides themselves with the dial-bore gauge. According to Alvarez, guides should come in at 0.001 inch clearance on the intake side and 0.0015 inch on the exhaust. If the guides are bigger than this (i.e., loose) they must be
30 Jan 2014 For example, there are a couple quick checks you can do to verify whether the valve guides and seats are still in good condition. The test doesn't actually measure guide clearance, but it will give you a good idea if you need to take your heads to an engine machinist to have them worked over. Now, this isn't
2 Jan 2011 So some guide bores are not perfect to the OD. of the guide casting. The way to check clearance without specialty tools is to install valve into guide. Then raise it about 1" off the seat and try to move it sideways in all directions in the guide. There should be a very slight movement. More than that is excessive.

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March 2018