V6 Chevy 90 degree engines
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===4.3L V6=== | ===4.3L V6=== | ||
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;1986 | ;1986 | ||
UAB: MT, VIN H, Sierra p-u | UAB: MT, VIN H, Sierra p-u | ||
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1993 T15 (GMC Typhoon) | 1993 T15 (GMC Typhoon) | ||
3LD | 3LD | ||
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==Blocks== | ==Blocks== | ||
The Chevy 90º V6 is formed by the removal of the #3 and #6 cylinders of a SBC. All three V6 engines share the same 4.4" bore spacing and 9.025" deck height of the SBC engine. | The Chevy 90º V6 is formed by the removal of the #3 and #6 cylinders of a SBC. All three V6 engines share the same 4.4" bore spacing and 9.025" deck height of the SBC engine. | ||
| − | Production 1992 4.3L engines with RPO L35 had modified cylinder blocks where a balance shaft | + | Production 1992 4.3L engines with RPO L35 had modified cylinder blocks where a balance shaft is used. The balance shaft is gear-driven off the front camshaft gear; camshafts for use with balance shaft motors have a longer dowel pin, which cannot be interchanged with non-balance shaft engines. The current engine block in production since 1995 eliminated the front and rear freeze plugs with extra strengthening ribs. The oil pan used was changed from stamped steel to an aluminum alloy casting. The engine block has 10 oil pan bolts, making the early and late oil pans incompatible. |
==Cylinder Heads== | ==Cylinder Heads== | ||
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#200 cid (3.4L), it is basically 3/4 of the 267 cid SBC V8. Made 1978–'79. | #200 cid (3.4L), it is basically 3/4 of the 267 cid SBC V8. Made 1978–'79. | ||
#229 cid (3.8L)- not to be confused with the Buick-derived 3.8L 231 cid V6). It is 3/4 of the 305 SBC V8. Made 1980-'84. | #229 cid (3.8L)- not to be confused with the Buick-derived 3.8L 231 cid V6). It is 3/4 of the 305 SBC V8. Made 1980-'84. | ||
| − | #4.3L (262 cid) is 3/4 of the SBC 350 and as such, shares some of the parts and dimensions with the 350. Made 1985-2014. The 1992 model year saw the first use of a balance shaft; all 1995-present 4.3L V6 engines are equipped with a balance shaft. The 4.3L V6 got a revised cylinder head in 1996 with specs much like the SBC V8 [[Vortec L31 cylinder head]]. | + | #4.3L (262 cid) is 3/4 of the SBC 350 and as such, shares some of the parts and dimensions with the 350. Made 1985-2014. The 1992 model year saw the first use of a balance shaft; all 1995-present 4.3L V6 engines are equipped with a balance shaft. The 4.3L V6 got a revised cylinder head in 1996 with specs much like the SBC V8 [[Vortec L31 cylinder head]]. Passenger car usage was limited to B and G-bodies; after 1990 (with the exception of some 1991-'92 fleet Caprice) the 4.3L V6 was used exclusively in truck/van/SUV and marine/industrial use. |
| − | The 4.3L V6 has the advantages of far better availability, a larger displacement and larger bore diameter than the 200 cid or 229 cid V6. It also enjoys better aftermarket support. For these reasons, the 4.3L | + | The 4.3L V6 has the advantages of far better availability, a larger displacement and larger bore diameter than the 200 cid or 229 cid V6. It also enjoys better aftermarket support. For these reasons, the 4.3L is the preferred Chevrolet V6-90 engine for performance use. |
==Bore and stroke== | ==Bore and stroke== | ||
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[[File:OEM 4.3 L V6 Q-jet intake 1986-back.jpg|thumb|left|OEM 4.3 L V6 Q-jet intake 1986-back]] | [[File:OEM 4.3 L V6 Q-jet intake 1986-back.jpg|thumb|left|OEM 4.3 L V6 Q-jet intake 1986-back]] | ||
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| − | The 1985 Astro van had this intake; passenger cars came standard with TBI fuel injection | + | The 1985 Astro van had this intake; passenger cars came standard with TBI fuel injection. Passenger cars (B- and G-body) as well as trucks/vans manufactured after the 1986 model year (including 1988-'94 S-series trucks) came with TBI intakes. A central port injection intake manifold (with an upper and lower casting) was introduced in 1992 which has a central fuel injector with six poppet valves (used with the Astro/Safari and S-series SUVs (Blazer, Jimmy, Bravada), later revised in 1996 with sequential fuel injection. Central port injector used with 1996-'01 were known to have fuel leakage where GM redesigned the fuel spider which converts the CSFI system to a multipoint injection system. |
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| + | The limited production Syclone/Typhoon has an intake manifold which uses a multipoint injection setup (with a throttle body similar to the one used with the tune port injected Corvettes and IROC-Z Camaro/Trans Am). Parts for such a conversion do not exist from the aftermarket. | ||
===Marine intakes=== | ===Marine intakes=== | ||
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*[http://www.brodix.com/heads/v6heads.php Brodix heads] | *[http://www.brodix.com/heads/v6heads.php Brodix heads] | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:GM]] | [[Category:GM]] | ||
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