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87 chevy truck, 4.3L V6 to convert to a 5.7L V8-California Smog legal
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homer4555
I love my Chevy Chevette!
| Posts: 24
| Joined: 12/08
Posted: 12/03/08
09:34 PM
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I want to change my gutless v6 out to a 350 in my 87 chevy 1/2 ton, but I am curious what kind of exhaust I can run, what kind of Emission equipment in need, and whether or not I have to change out the computer. I am going to run the same style TBI, but do I need to also use some kind of air injection pump like the 4.3 has to work with the EGR. I need as much information I can get on this one guys.
Any other modifications, or smog related equipment I need to include, please let me know.
Keep in mind this needs to pass California's Strict Smog guidlines
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55Guy
I mow my lawn and find Chevys
| Posts: 1027
| Joined: 07/06
Posted: 12/04/08
12:43 PM
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Ok. This is a fairly easy swap. I've got a '92 Silverado with TBI here in Florida, I know the trucks well.
What you need to do is comb the slavage yards for an '87 (you can look at any TBI truck '88-'95 for parts, but I don't know if the later models still had AIR pumps in California) V-8 GMC or Chevy truck or Subrban/Tahoe with either a 305 or a 350 (preferrably a 350). From there, pirate off the whole front accessory drive/assembly from the motor. You'll also want to get all the AIR lines from the exhaust manifolds, the manifolds themselves, everything to do with the emissions system.
You'll also need to get a 350 TBI unit (look for a '92-'95 manifold and TBI unit, they're the best), and the front fuel lines and intake manifold, again from a '87-'95 truck, and an corresponding V-8 distributor. After that, you just need the exhaust system from a V-8 truck, including the cat converter, and you're good to go.
The great thing is you can bolt this onto any 350. If you're pulling the motor out of a yard, look for a '92-'95 truck motor, go through it, freshen it up, put a mild hydraulic roller in it, and have fun.
You can build any 350 for your truck, just make sure you get a CARB certified cam (call Comp Cams, they'll make sure you get the right stuff), keep your net compression between 9 and 9.5 to 1, and you should be able to pass smog with no problems.
Post back, let us know how things are going.
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