Stock valve springs on vortec heads are compatible with valve lift of up to 0.450".
They are basically the same heads, If the 93 350 is a vortex motor.
yes! depending on the block. ie. a 350 or 305 will work with newer heads and intakes. as long as you have the correct gasket. the heads can not be reverse flow. they will not work without modification.
Why 400 heads? They are notoriously bad flowing heads without much modification the engine would be about 360 cubic inches, but the heads have nothing to do with the size of the engine.
I don't know if they're vortex, or what that means, but they were used on 305's and 350's, '87 and up, and they have 1.94 intakes and 1.50 exhausts.
Yes their the same block....
no!
No! The angle of the intake bolts are not the same. Also The vortec heads will make more hp so you probably will not want to use standard Heads..
block and heads are the same but not the computers
They won't even bolt on the 72 engine.
it holds something up and if its not then something is wrong
The headers for a 350 and 305 are the same.
yes you can but it takes some modification with the fuel pump