Editing V6 Chevy 90 degree engines (section)
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==Intake manifolds== ===Aftermarket intakes=== Edelbrock makes two square bore four barrel intakes for the Chevy V6 90 degree engines: *p/n 2114 for vortec heads *p/n 2111 for non vortec heads GM makes several intakes as well: [[File:Gm highriseV6.jpg]] *p/n 10134390 (above) is a square bore (although has both bolt patterns), high rise, has no EGR, made for use with a 390 CFM Holley although other carbs will work. Suitable for high performance street/strip use. *p/n 10051125 is the base for the raised runner cross ram intake, race only unless the engine is very healthy (below left). **p/n 10051126 is the 'upper cover' for the base. It will mount a squarebore or 4500 carb; carb flange is undrilled (below center). **p/n 10134327 is an airflow deflector used with the raised runner cross ram intake (below right). [[File:Raised Runner Intake Manifold Base.jpg]][[File:Raised Runner Intake Manifold Cove.jpg]][[File:Manifold Deflector.jpg]] ===OEM=== There is only one production factory Q-jet intake available and it was only made for two years, 1985-'86. It is found in light duty pickups/vans. It's a heavy cast iron dual plane piece, has EGR and a heat crossover. It works OK for mild builds. [[File:OEM 4.3 L V6 Q-jet intake 1986-back.jpg|thumb|left|OEM 4.3 L V6 Q-jet intake 1986-back]] <br style="clear:both"/> 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. 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=== There are several marine intakes, both for the Rochester 2G-type 2-barrel and the Q-jet spreadbore and Carter squarebore (uses an adaptor) 4-barrel carbs, all cast iron. In fact the only aluminum intake for the V6 Chevy 90ยบ 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. Marine intakes have either the traditional 12-bolt pattern (200/229 and pre-1996 4.3L) or the 8-bolt Vortec pattern for 1996-present. The angle of the center intake mounting holes changed during 1987 to 72 degrees, same as the SBC. *p/n 14097284, Q-jet only, no EGR *p/n 14095286, squarebore only, used with the Carter carb *c/n 12552422, 2G 2-barrel intake [[File:Marine 4.3 L V6 1995-back non Vortec intake.jpg|thumb|left|1995-back non Vortec intake p/n 14097284]] [[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]] {{Clear}} [[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]] {{Clear}}
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