Building Chevy 4.3 liter V6 - 1994 with balance shaft
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'''CYLINDER HEADS''' | '''CYLINDER HEADS''' | ||
| − | + | The 1994 V6 "Vortec" heads are '''NOT''' the same as the OEM LS31 heads for the 350ci V8's. They are "Vortec" heads but do not yet feature the heart shaped combustion chamber. Apart from the chamber design they already feature the "Vortec" ski-jump ramp. | |
| − | The 1.94 Intake and 1.50 Exhaust valves should have acceptable flow at low lifts which would be a nice thing for a daily drive and low to mid rpm power band modifications. At the same time this will keep the cost way down. Modifications for screw in studs and decent roller rockers | + | |
| + | It would be cool if somebody with access to a flow bench could flow a pair of these heads. | ||
| + | |||
| + | The 1.94 Intake and 1.50 Exhaust valves should have acceptable flow at low lifts which would be a nice thing for a daily drive and low to mid rpm power band modifications. At the same time this will keep the cost way down. Modifications for screw in studs and decent roller rockers should deliver more power and a sturdy valvetrain. | ||
| + | |||
| + | '''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. | ||
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