Originally Posted by pwchevyman1990
i have a 1977 chevy carbureted v8 350 with only 1500 miles on a complete rebuild and i was wondering if i could take the intake manifold from a 1994 chevy tbi and put that on the 77 so i had a new motor for my 94 chevy truck
will i be able to swap the intake manifolds and heads?
Some things to consider. You can swap heads AND intake, but you can't mix and match the heads and intake. If you want to put the TBI intake on the 77 engine, you'll either have to buy a different TBI intake to match up to the old heads, or swap the TBI heads on to the 77 to go with it. The difference is with the center four bolt holes. On the old heads, the holes are all perpendicular to the head mounting surface. On the TBI heads, they are at 72 degrees. The dirty way to mix and match TBI intakes and heads is to hog out those center four bolt holes so they will fit the different angle. Another potential way of doing it is to use the complete 77 assembly (including its carbed intake) and put an adapter on the carb flange that lets you use the TBI on it.
The other thing you'll run into is that the 94 truck engine is a 1-piece rear main seal with a different flywheel bolt pattern, and it might
be a different size, or have a different torque converter bolt pattern depending on the original application. It should be a no-brainer. The flywheel from the 77 engine will obviously bolt on to the 77 crank, and should have the right TC bolt pattern on it, but there is a chance it doesn't.
As far as the sensors and stuff, its pretty straight forward. The gauges will all use the same basic sensors, but the computer will need input as well. Most carbed engines have one coolant sensor for the gauge, but the TBI will have a second sensor for the computer. Most of the other sensors are in the TB itself or the air filter; TPS, IAT, etc. The MAP sensor needs a vacuum line to the manifold. Just take a look at things and you'll see that they're pretty self-explanatory. The blocks are functionally the same when it comes to sensors. Just unscrew any extra sensors used for the TBI from the 94 block and put them in the same location on the 77 block.