1990 was amendments to the original Clean Air Act from 1963...The Federal Clean Air Act of 1990 goes back to 1963 model year motor vehicles though it is seldom enforced.
Minor point of law. Lol
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1990 was amendments to the original Clean Air Act from 1963...The Federal Clean Air Act of 1990 goes back to 1963 model year motor vehicles though it is seldom enforced.
Smog exemptIs a 71 even tested anymore?
For now.Smog exempt
Sound kinda trouble!!The engine drops right in. May need to dick with oil filter adapter, especially if the Vortec is from a 4X4 truck. The Vortec engine will need it's flexplate/flywheel, the '71 unit won't bolt to the crankshaft.
If you're keeping the computer control of timing and fuel, you'll need a higher-pressure fuel pump, and pretty-much the entire engine-compartment wire harness, sensor array, and output devices--EGR, IAC, electronic distributor/module, etc. from the donor truck.
Not sure about catalyst/exhaust, especially in California. I'm thinking the whole emissions system has to match the truck or the engine, whichever is newer. But CA emissions is way beyond my experience.
The reward for living in California.Sound kinda trouble!!
The reward for living in California.
Verify with the Emissions Police BEFORE you spend money or commit to a plan of action.
Personally, I would go with the Vortec long block, run a Vortec 4-barrel intake, and either a carb or the 4-barrel fuel injection of your choice. My '89 has a 4-bolt main TBI block with roller cam provisions, Vortec heads, and a Holley Sniper.