V6 Chevy 90 degree engines
(Created page with '==Overview== A look at the Chevy V6 90º engines used from 1978-on. ==Blocks== The Chevy 90º V6 is formed by the removal of the #3 and #6 cylinders of a SBC. All three V6 engin…') |
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The 4.3L V6 engine has an even-fire sequence. This is accomplished by having a larger 30º offset on the rod journal pairs. To gain back the strength that the wider offset takes away from the crank, the rod journal diameter is larger than the other V6 engines and also larger than the SBC, at 2.25", which makes them unique among the Chevy V6 and V8 engines. | The 4.3L V6 engine has an even-fire sequence. This is accomplished by having a larger 30º offset on the rod journal pairs. To gain back the strength that the wider offset takes away from the crank, the rod journal diameter is larger than the other V6 engines and also larger than the SBC, at 2.25", which makes them unique among the Chevy V6 and V8 engines. | ||
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| + | ==Intake manifolds== | ||
| + | There is only one Q-jet intake available and it was only made for two years, 1985-'86. It's a heavy cast iron dual plane piece, has EGR and a heat crossover. It works OK for mild builds. | ||
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| + | There are several marine intakes, both for the Rochester 2G-type 2-barrel and the Q-jet and Carter squarebore (uses an adaptor) 4-barrel, all cast iron. In fact the only aluminum intake for the V6 Chevy 90º is a 2-barrel single plane(!) piece that was used for several years on the 200 and 229 cid engines. Not a performance-oriented part, it has a bolt pattern for the Dualjet (basically the front half of a Q-jet), which means no other carbs will fit it and there are no adaptors, either. | ||
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| + | [[File:'96-up 4.3L MARINE VORTEC INTAKE OPEN PLENUM, CAST IRON.jpg|thumb|300px|right|4.3L marine Q-jet cast iron single plane intake for the '96-up Vortec heads]] | ||
| + | [[File:4.3 L V6 MerCruiser Alpha One Generation Two Vortec Intake w- 2 barrel carb c-n GM 12552422.jpg|thumb|left|350px|1996-up 4.3 L V6 MerCruiser Vortec dual plane intake for 2 barrel carb, c/n GM 12552422]] | ||
| + | [[File:1993 Mercruiser 4.3 LX V6 SQUAREBORE INTAKE P-N 14095286, CARTER CARB -339196005.jpg|thumb|center|300px|1995-back Mercruiser 4.3 V6 squarebore P/N 14095286, Carter carb 339196005]] | ||
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| + | ==Oiling system== | ||
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| + | [[File:4.3L V6 OILING 1.jpg]] | ||
| + | [[File:4.3L V6 OILING 2.jpg]] | ||
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