Timberwolf said:
Does anyone have info on intakes
The 229 came w/the Duojet carb (primary side of a Q-jet) on an aluminum SINGLE PLANE 2-bbl. intake and was never offered from the factory w/a 4-bbl. or EFI. So using a factory cast iron (I never understood WTH this intake wasn't made of Al) Q-jet intake is an option- but the runners are cut down between them, creating a shared runner effect. The 4.3L heads are also cut down in the same manner as the intake, the 229 is the same as a traditional SBC in this regard.
There are intakes available from Edelbrock P/N 2111 (about $200 from Summit) and Holley (discontinued) P/N 701R-34; 300-34 (expensive if you DO find one)
Cam from Competition Products, OEM-type is $14.00! Cams differ between the 4.3L and the 200/229 so do not interchange them!
GMPP has P/N 6269733:
"This hydraulic flat tappet is a marine cam for 229 ci V6 with 108-132 degree semi-even fire crankshaft. It's a good street performance cam. The duration at lash point in degrees (intake/exhaust) is 294/306; duration at .050" tappet lift (intake/exhaust) is 202/210; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 410/410. Lobe centerline is 113 degrees."
Heads could be either 1.84" intakes or 1.72" intakes. You know which you want, right?
4.3L heads will fit. If you can mill them down far enough to get a decent CR, they have 1.94" intakes. But I wouldn't even consider this unless they were the 'real' Vortec heads 1996-up. This would also mean a $pecific intake manifold to fit those heads.
There were several years that OEM tubular headers were used on the 4.3L, 1986 was one. These headers are shorty-style, and will flow better than cast iron manifolds, but not as well as full length headers that cost a whole lot more. They fit the 229 just fine.
FYI- The 1980 229 was rated at 115 HP @ 4000 RPM and 175 ft/lb TQ @ 2000 RPM. Really dismal.
The 4.3L engine is hands down a better choice.