Vortec L31 cylinder head
(→Pushrod guide holes: Add warning text) |
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* Without resorting to welding up the holes to form slots to provide side to side alignment, Vortec heads cannot be used w/non self aligning rockers unless guide plates are used. Heads can use guide slots, OR guide plates, OR self aligning rockers, but only ONE of the three at any given time. | * Without resorting to welding up the holes to form slots to provide side to side alignment, Vortec heads cannot be used w/non self aligning rockers unless guide plates are used. Heads can use guide slots, OR guide plates, OR self aligning rockers, but only ONE of the three at any given time. | ||
* If using 1.6 ratio rockers, there's a chance the Vortec's 7/16" hole will not be large enough. A Lewis tool will not work, so instead, a drill bit larger than 7/16" can be used to open the pushrod holes up. Most often a 1/2” bit is used, but in any event use what ever size is needed to get the needed clearance. The push rod hole can also be lengthened with a grinding tool like a Dremel or die grinder. As a last resort this can be done using files. | * If using 1.6 ratio rockers, there's a chance the Vortec's 7/16" hole will not be large enough. A Lewis tool will not work, so instead, a drill bit larger than 7/16" can be used to open the pushrod holes up. Most often a 1/2” bit is used, but in any event use what ever size is needed to get the needed clearance. The push rod hole can also be lengthened with a grinding tool like a Dremel or die grinder. As a last resort this can be done using files. | ||
| − | * If non self aligning rockers | + | * If '''non''' self aligning rockers are used, they '''''must''''' be accompanied by some means of guiding the push rod. This means guide plates in almost every case, because the pushrod hole is unsuited as a guide. |
| + | {{warning|Only one form of pushrod guide can be used. If self aligning rocker arms are used, there cannot be a guide plate used. Conversely, if non self aligning rocker arms are used, guide plates are required.}} | ||
==New GM Vortec heads== | ==New GM Vortec heads== | ||
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