No 305 heads bolt up different then 350 heads If they are 305 vortec they will bolt up. However they do not have the same flow. The 305 vortec head has smaller runners, smaller valves and does not have the same heart shape combustion chamber. Now if you meant the older 305 heads onto a 350 vortce then no they will not. The vortec uses raised runners and the ports will not match. On top of it all the 5.7 vortec has more flow then any other production head. Placing a 305 head in its place would be going backwards.
Yes, and it is an upgrade worth the swap. Let me give you a tip. The 97, will have the newer vortec, 1st design. If you can use the marine version of these heads, as they are thicker castings, and will not overhead, or crack on you. This is really a move more for the high performance. Either casting will be fine for street use.
All 1997 GM vehicles were fuel injected and all had the electric fuel pump mounted in the fuel tank. None had a mechanical fuel pump mounted on the engine block. A 97 Chevy 350 Vortec uses an electric fuel pump and sender assembly in the fuel tank. If it is a true 1997 block, then it doesn't have a place for a fuel pump on the block.
In 1992 GM added a balance shaft to the block to control vibration. Other than that the engine was the same since 1985(aside from intake changes on the CPI models) In late 1995 GM changed the head design allowing it to flow better, making more power. Along with its head change, the way the intake bolts onto the heads changed, making it unique to these newer engines. These are what everyone refers to as the 4.3L Vortec. Even though 1987 and on Truck engines carried the Vortec referance name. The Block however really never changed from 1992. Unless you want to do a complete transformation, to newer engine, wiring, fuel pump, PCM/ECU...... ...then the S10 4.3L Vortec Supercharger is no good to you. However if you search a little more, there is companies that make superchargers for the TBI models. :http://www.tbi-superchargers.com And for you carburetor guys. :http://www.procharger.com/chevy.shtml
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