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They are basically the same. It may change the compression ratio slightly depending on the heads. You can find the casting number in the rocker arm area and compare specs using those numbers.
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Do the 305 vortec and 350 vortec have the same heads?
No. The 350 has bigger valves. While you CAN put the 305 heads on the 350, (I can't imagine why you would actually want to) you can NOT put the 350 heads on the 305. Because of the 305's small bore, the valves on the 350 heads will hit the cylinder block.
How do you swap a 95 305 Chevy for a 350 Chevy engine?
the block & heads are the same you just have to pull the 305 out & put the 350 back in
Will 1979 305 heads fit a 1988 350 vortex block?
Yes they will, But you will have to drill the 4 center bolt holes out in the 88 intake to make it bolt up to the 305 heads. I don't no why anyone would want to put 305 heads on a 350 engine, The 350 will never run like it did before.
Can you put 305 heads on a 350 bored 30 over?
Yes. Beware that 305 heads usually have smaller combustion chambers than a 350, which would increase the compression ratio, possibly requiring premium fuel to avoid pinging.
I have a 1993 chevy 350 that came out of a van. it has 2 barrel heads with a throatle body. i want to change it to a carburter.ihave a 1984 305 4 barrel heads .will heads work on 1993 350?
Chevy heads are not thought of as 2 barrel or 4 barrel like Ford Cleveland heads. Your 350 has heads with bigger valves than a 305. The 305 heads might have smaller combustion chambers, which would raise your compression ratio. Before pulling the trigger on this swap, I'd suggest you contact Summit or Jeg's and ask them about interchangeability of the intake. It's possible that a new intake is all you need to put the carb on your 350.
Will 305 cylinder heads cause overheating on 350?
They can if the heads are cracked ,are the intake manifold gaskets were put on wrong when thay were installed. The heads themselves if thay are good heads will not cause overheating. You cannot put the head gaskets on wrong on a small block Chevy engine.
Im lookin at a 305 block with 350 heads minor mechine work done to them a mild cam and intake and the block was just redone would it b worth putting in your truck now it has a 350 in it?
You sure about that being a 305 with 350 heads. If so, skip it. The compression would be terrible.....Extremely low. Most 305 engines use somewhere around 58 cc heads. If I remember correctly. 350 uses 72-76. Of course there are many that are lower cc... especially the hi-po heads. Doubtful that the ones on there would be that small. If you have something stating the cc of the heads from the machine shop that would give you a place to start. One of the things guys have done is just the other way around. 305 heads with a lot of work done to them put on a 350 to up the compression. Unless you are planning on a supercharger or blower you won't want that 305.
Can you put a set of 307 heads on a 305 block?
Yes you can.
Can you put a 350 engine where a 305 used to be in a 1983 Chevy silverado?
Yes, but the exhaust Y pipe from the 305 may not fit the 350.
Someone answered and said not to use 350 heads on a 305 but when buying a set of heads through summit racing the heads are listed as follows 262-400 or all small block 1965-86 could someone explain?
.. The blanket statement don't use 350 heads on a 305 isn't correct. Many of the heads that came on 350 engines had large combustion chambers and fairly large valves, but some will work great. If you put a set of heads with large chambers on an engine that was set up (piston compression height) for small chamber heads you'd get very low compression, which would cause the engine to run poorly and have less horsepower. If you put big valves on a small engine such as the 305, they won't clear the small bores. The head castings from a 350 would physically fit a 305 block, but in some cases the engine wouldn't run very good. Aftermarket heads are sold with varying sizes of chamber volume and shape, different port volumes, and different valve sizes. A person looking for improved heads for their 305 engine should consult with one of the technicians at Summit racing or other high performance parts outlet about their application. Tell the tech what you will be using the 305 for...
You just put new heads and a cam in your 82 Chevy caprice wagon 305 v8 when it runs it sputters and smokes and it won't idle the timing chain is not off what could be wrong?
Is the distributor put back in correct? Sounds like it is out 180 degrees. i don't know what heads you have on there, but note that you cannot run 350 heads in a 305. the valves are too large to open all the way and will damage themselves on the block since the 350 heads are intended for a block with a larger bore. Most high performance heads are made for 350 or larger small blocks. Your intake valves should be no larger than 1.85 inches, if they are, you have the wrong heads for your motor.
Is it a good idea to put the heads from a 1979 305 60cc on a 1969 350 block?
putting 305 heads on a 350 will work.you have to chamfer the edges on the combustion chambers because the 305 has a smaller bore.If you leave the sharp edges you will have bad engine knocking,probably causing damage.You will probably increase compression ratio by about a point or so doing this swap also.The 305 has smaller valves and passages which is good for torque,but engine will probably not make good power above 5000 rpm.This engine would probably do well in a pickup truck,or daily driver worried more about good gas mileage instead of performance.350 heads will not work on 305 though,305 bore too small for big valves.
