Building Chevy 4.3 liter V6 - 1994 with balance shaft
(→TEST ASSEMBLY) |
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The final result is a CD of 1.575" to reach zero deck. The pockets need not be very deep. Despite the higher lift of around 0.555" with a 1.6:1 ratio rocker arm with this lame camshaft it looks as not being a big issue. We'll see what comes from it once I have the new pistons where we end up. | The final result is a CD of 1.575" to reach zero deck. The pockets need not be very deep. Despite the higher lift of around 0.555" with a 1.6:1 ratio rocker arm with this lame camshaft it looks as not being a big issue. We'll see what comes from it once I have the new pistons where we end up. | ||
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| + | ''' ASSEMBLY ''' | ||
| + | The crankshaft is in good conditions and only needs polishing. I have used two old bearings in the first and last bearing as the forces of a test assembly of this kind of engine won't make any difference if all or just two mains are used. When assembling for final testing with the real valve springs I'll have all mains installed. All put together with a generous amount of engine oil. | ||
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| + | The piston and rod were easy. We had one piston pin polished by about 1/1000 and the OEM which are a press fit in the stock rods are a float in the new EAGLE rods. With no rings it was just cleaning out the bore add a bit of oil and slide the assembly in and center the rod on the crank pin. The quality of the rods is amazing. | ||
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| + | Make sure you have the correct orientation of the rods - they are offset. | ||
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| + | In order to assemble the block we put the first and last camshaft bearing (the old ones) back into place after having checked and deburred them. Make sure the new camshaft is not nicked or scratched by a bad bearing or when putting it into the block. | ||
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| + | Next was the new chain drive which installed easily. | ||
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| + | I found that when the camshaft marks are aligned and the engine is at TDC the valves are actually in overlap on the #1 piston and not on the compression stroke. Interesting that this is never explained in any literature I have. | ||
| + | After having looked at several cam diagrams there seem to be both versions. For the CHEVI most use -360 deg to 0 and up to +360 deg on the charts. My raw data chart does simply look different but has the same data. The datapoints measured are exactly where the advertised cam chart said they should be. | ||
=== CAMSHAFT DEGREEING === | === CAMSHAFT DEGREEING === | ||
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