Building Chevy 4.3 liter V6 - 1994 with balance shaft
(→MACHINING AND PORTING) |
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| − | + | '''HEADS - PORTING''' | |
| − | '''PORTING''' | + | |
I will not port the heads as this would imply access to a flow-bench. What I will do is blend all sharp edges in the combustion chamber even if it will cost me a bit of CR (compression ratio) to avoid hot spots in the chamber. Then the blending will extend into the runners behind the valve-seats. Also the valve stems will be blended to a blunt round shape inside the runner. Avoiding sharp edges there will help keep the flow. | I will not port the heads as this would imply access to a flow-bench. What I will do is blend all sharp edges in the combustion chamber even if it will cost me a bit of CR (compression ratio) to avoid hot spots in the chamber. Then the blending will extend into the runners behind the valve-seats. Also the valve stems will be blended to a blunt round shape inside the runner. Avoiding sharp edges there will help keep the flow. | ||
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| + | '''HEADS - MACHINE''' | ||
| + | I have to remove all the studs and prepare the geometry for screw in studs. I'll go with whatever the cam company recommends either 3/8 or 7/16 studs. The choice of rockers will also be decisive. Aiming at a nice steel roller rocker such as CompCams Magnum Pro Roller Rocker 1,6:1. The geometry defined I'll have the bosses machined for proper height of the studs then the centers bored according to proper alignment from the lifter bores to the valve stems. | ||
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| + | Machine the valve pockets and the valve guide bosses for clearance to accomodate the new lift. | ||
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