Building Chevy 4.3 liter V6 - 1994 with balance shaft
(→TECH STUFF ABOUT THE 1994 4.3l V6) |
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'''HEADS''' | '''HEADS''' | ||
| − | There is a particularity here! GM in the years around 1990 has started to adopt the metric system for some applications. Some threads may be metric. Should you ever come to find a bolt hard to fit check threading. In particular the screw in studs on 1995 and later may be metric M10 x 1.5's from factory. Some ARP aftermarket studs have this threading as well. Heads have stamped rockers, pinched nuts on pressed studs. This will definitively be one of the mods. | + | There is a particularity here! GM in the years around 1990 has started to adopt the metric system for some applications. Some threads may be metric. Should you ever come to find a bolt hard to fit check threading. In particular the screw in studs on 1995 and later may be metric M10 x 1.5's from factory or the smaller M8 threads. Some ARP aftermarket studs have this threading as well. Heads have stamped rockers, pinched nuts on pressed studs. This will definitively be one of the mods. |
At the moment I'm trying to figure if the heads correspond to L05 heads of the V8. They already feature the "ski-ramp" swirl ports (vortec) but not yet the kidney shaped combustion chamber. Further study and evidence indicate that I'm right on classing these heads. They do not flow terribly but should do the job. The only figures I came by for the exact casting numbers are low figure at 135 cfm and a higher number at 180 cfm. | At the moment I'm trying to figure if the heads correspond to L05 heads of the V8. They already feature the "ski-ramp" swirl ports (vortec) but not yet the kidney shaped combustion chamber. Further study and evidence indicate that I'm right on classing these heads. They do not flow terribly but should do the job. The only figures I came by for the exact casting numbers are low figure at 135 cfm and a higher number at 180 cfm. | ||
'''BLOCK''' | '''BLOCK''' | ||
| − | Nothing particular there. A couple of threaded holes are not used according to the vehicles type and RPO's. It seems that this is an engine still based on the GEN I smallblock cast iron block. | + | Nothing particular there. A couple of threaded holes are not used according to the vehicles type and RPO's. It seems that this is an engine still based on the GEN I smallblock cast iron block. It normally has only 2 bolt main caps. |
'''CRANKSHAFT''' | '''CRANKSHAFT''' | ||
| − | The crank is a cast, even fire crank and has standard mains as a V8 small block but has bigger rod pins at 2.25" diameter. Unfortunately this excludes a lot of aftermarket rods from the list. The last bearing, oil pump attachment etc. are also the same as a 350 SBC. | + | The crank is a cast, even fire crank and has standard mains as a V8 small block but has bigger rod pins at 2.25" diameter. Unfortunately this excludes a lot of aftermarket rods from the list. The last main bearing, oil pump attachment etc. are also the same as a 350 SBC. |
'''RODS''' | '''RODS''' | ||
| − | The rods are of standard lenght 5.700" but have larger big ends. Some confusion exists in the aftermarket as some manufacturers offer rods for the 4.3l V6 years from 1988 - 2007 but indicate 2.125" big end bores (crank pin diameter) which is not correct. The piston pins are press fit (heated) and will be changed to full floating. | + | The rods are of standard lenght 5.700" but have larger big ends. Some confusion exists in the aftermarket as some manufacturers offer rods for the 4.3l V6 years from 1988 - 2007 but indicate 2.125" big end bores (crank pin diameter) which is not correct for the even firing engines. The piston pins are press fit (into pre-heated rods) and will be changed to full floating. |
'''PISTONS''' | '''PISTONS''' | ||
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'''LIFTERS''' | '''LIFTERS''' | ||
| − | This has come to a surprise. It employs a plastic retainer along the full side of the lifter valley. One left, one right | + | This has come to a surprise. It employs a plastic retainer along the full side of the lifter valley. One left, one right whith two bolts each fixed down into the block. We'll see what to do of it. Seems a nice and easy way to keep the lifters where they belong. It has some oil holes and a lot of small fins that are for oil drain flow. |
I'll add more stuff as I go and discover what is particular or what differs largely from a standard pre 1988 small block. | I'll add more stuff as I go and discover what is particular or what differs largely from a standard pre 1988 small block. | ||
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