Yes they will with no problems. They are basicly the same heads, Just different CCs.
the water jackets are different , the motor will keep running hot
The heads will fit the block, but the vortec intake manifold will not bolt to the old style heads.
YES, they sure will.
Yes they will fit right on there with no machine work are problems.
Yes, they will work. but you wont gain power because the little 305 isn't putting out enough flow to keep up with the heads
NO.. It won't even bolt up.
The word 'vortec' is the name of the cylinder heads used in Vortec Model engines in the year 96'+ The engines that use the Vortec cylinder heads are the 4.3L Vortec, 5.0L Vortec, 5.7L Vortec, and 8.1L Vortec. They were only put on Gen I small blocks. If they are any other size Chevy engines and still retain the Vortec name then it's purely a marketing name, the same goes is it is later than a Gen I engine. For example the new 4.2L I6 from GM retains the name Vortec, but it does not actually use Vortec heads as these heads were only made for OHV engines, and the I6 is an OHC engine. The Vortec heads are based on the LT1 and LT4 head after they were discontinued along with their reverse flow cooling design. It is simply an effect made in the head similar to a vortex to better atomize the fuel and air intake charge when entering the combustion chamber, it is not a different type of motor.
The word 'vortec' is the name of the cylinder heads used in Vortec Model engines in the year 96'+ The engines that use the Vortec cylinder heads are the 4.3L Vortec, 5.0L Vortec, 5.7L Vortec, and 8.1L Vortec. They were only put on Gen I small blocks. If they are any other size Chevy engines and still retain the Vortec name then it's purely a marketing name, the same goes is it is later than a Gen I engine. For example the new 4.2L I6 from GM retains the name Vortec, but it does not actually use Vortec heads as these heads were only made for OHV engines, and the I6 is an OHC engine. The Vortec heads are based on the LT1 and LT4 head after they were discontinued along with their reverse flow cooling design. It is simply an effect made in the head similar to a vortex to better atomize the fuel and air intake charge when entering the combustion chamber, it is not a different type of motor.
it will work I have vortec heads on a 72 400 small block, I had to get the heads reworked for the 400s water ports or steam port and a vortec type style intake will be needed
NO. That would be the TBI / throttle body injection engine Not a vortec. The vortec will not work in the 91.
NO it will not. You would need the heads off the vortec engine to make it all work. The 96 that you are talking about should be a VORTEC engine already from the factory. But you may have an early 96 and that is why it is a TBI engine. That was the year they switch to a vortec. 96 TBI no such animal,TBI OBD2 no
That's what should be on it.