Small block 400 heads.
02-09-2012, 07:22 PM
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Small block 400 heads.
Found a set of small block Chevy 400 heads today. My question is, will these bolt on to a stock 305, and if so what advantage would they have? All I know is they have larger valves. If they will fit, is there anything I need to change or modify to get them on?
02-09-2012, 07:35 PM
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Re: Small block 400 heads.
About the WORST heads made,and far worse to put on a 305.They have bigger valves,but also large 76cc chambers,which will KILL your compression.They flow bad,there is no good reason to use them for anything but a stock 400 or a doorstop.
02-09-2012, 07:36 PM
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Re: Small block 400 heads.
Whether they would be any good is a different story.
If chambers are too big then you will drop compression =less power
Casting # on 400 heads?
02-09-2012, 07:38 PM
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Re: Small block 400 heads.
The best mod you can do with those heads is pull one exhaust valve out, stick a rope thru the port and use it as a boat anchor...
Or just scrap them, prices are up !!!
Or just scrap them, prices are up !!!
02-09-2012, 07:58 PM
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Re: Small block 400 heads.
I haven't bought them, apparently its not a good idea. Thanks guys. I'm about to pull the heads off my 305 to have then rebuilt. I've also found a set of another 305 heads already re-built, and ready to bolt on for $175. Pretty sure I have a blown head gasket. I'm looking for a decent set of headers also. Hint hint!
02-09-2012, 08:21 PM
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Re: Small block 400 heads.
The 400's 882 heads are garbage. Door stops and boat anchors. They have zero performance potential.
02-09-2012, 08:23 PM
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Re: Small block 400 heads.
You only have to drill the HEADS if you use them on a 400 block because of the siamesed cyl walls..
305s dont have siamesed cyl walls..
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