Building Chevy 4.3 liter V6 - 1994 with balance shaft
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'''HEADS - MACHINE''' | '''HEADS - MACHINE''' | ||
| − | I have | + | I have removed all the studs and prepared for screw in studs. I'll go with 3/8" 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. Came up some new information about valvetrain geometry which will be incorporated here. |
Machine the valve pockets and the valve guide bosses for clearance to accomodate the new lift. Still have to see to what happens once I get the pistons. | Machine the valve pockets and the valve guide bosses for clearance to accomodate the new lift. Still have to see to what happens once I get the pistons. | ||
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| + | ''' PISTONS ''' | ||
| + | 30MAR2016 ordered custom pistons at JE-Pistons. They will be forged flat top with two valve relief pockets for the V6 (means a set of 6). We're running the risk as we had to get the compression distance (CD) right in order to achieve the target 10:1 compression ratio (CR). The stock pistons sit so low below deck that the standard 1.5" CD did not work out. Even the available 1.565" is not even close enough to reach 9.7:1. At this time we're aiming at zero deck height with a 1 mm (0.04") gasket uncompressed so we get an ideal 0.85 mm (0.034"). | ||
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| + | ''' RODS ''' | ||
| + | This seems to be the headache for all builders venturing into the 4.3l V6. It uses 5.700" lenght rods (center to center) but has larger diameter big ends than the small block V8. They use 2.25" crank pins on this engine instead of the common 2.125" on the V8. Crane has it's sportsman series rods for sale for this engine but indicate 2.125" crankpins. Sent them an e-mail to enquire about the correct size. Would be a nice and fair priced rod. Else I have found an H-beam from EAGLE RODS with the correct dimensions. | ||
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| + | The piston pins will be full floating at 0.925" diameter to fit on standard rod's small ends. We will use wire locks as the dual spirolocks would be overkill on a street engine which I will hopefully not rebuild a second time. I hope to use the Blazer to haul parts around and not fix it again. Because of the rather tame target rpm we're not going crazy with the rings. Just ordered them as file fit's to define gaps when building it. | ||
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| + | Next will be the camshaft, lifters, rocker arms, valves, beehive springs, retainers (maybe titanium), locks and finally the pushrods once I have final dimensions for them. | ||
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| + | Let's continue the build. | ||
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