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  #46 (permalink)  
Old 02-02-2010, 11:54 PM
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Quote:
Originally Posted by handymann3
. 4c
. 4x (screw in stud)
. 5cx
. 5c
. 6s

Are any of these heads good?
The 4X IF from a 400 (455 heads had huge chambers) are OK- they have 98cc chambers. I touched on this in post #39.

The '75 5C heads are 101 cc, but they have smaller runners than the 6X. 5C are about 7cc smaller and the 4X are about 5cc smaller. Bigger is better, in this case.

There's really no reason to 'settle' for anything other than the 6X-4 heads- they're out there, you will just need to keep looking.

EDIT- I need to mention that these heads ALL need to be checked for cracks before buying. They're not known for cracking too bad, but I've gotten cracked 6X heads before, so I know it happens.

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Last edited by cobalt327; 02-03-2010 at 12:08 AM.
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  #47 (permalink)  
Old 02-03-2010, 07:33 AM
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Quote:
Originally Posted by cobalt327
The 4X IF from a 400 (455 heads had huge chambers) are OK- they have 98cc chambers. I touched on this in post #39.

The '75 5C heads are 101 cc, but they have smaller runners than the 6X. 5C are about 7cc smaller and the 4X are about 5cc smaller. Bigger is better, in this case.

There's really no reason to 'settle' for anything other than the 6X-4 heads- they're out there, you will just need to keep looking.

EDIT- I need to mention that these heads ALL need to be checked for cracks before buying. They're not known for cracking too bad, but I've gotten cracked 6X heads before, so I know it happens.
Where should I keed a eye out for cracking. Theres a guy selling a 400 with 6x heads but the engine is in pieces and needs a new connecting rob because he needed it for some other engine. I guess I will call and see if I could buy the heads off him.
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  #48 (permalink)  
Old 02-03-2010, 03:56 PM
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Update!!

Hey guys. Igave that guy with the 400 that was missing a rob a call. He didnt want to sell the heads seprate (6x heads with a code saying: D145 6x) so I asked how much for the whole thing. He said make a offer so I offered $200 and he agreed. The engine was rebuit and 10 days later spun a bearing so he took it apart again and re machined the crank. After he was all done and was starting to re assemble it when he found a 421 or a 428 I cant remember really but all it needed was a connecting rod so he swiped it from the 400. He said its almost all there exept for the oil pan and intake although he has the one from the 428 or what ever that he said would fit. It has been sitting a while and he said so the crank has a little light rust. Anyway guys what do you say? I say pick it up and slap it togeather with a new rod from summet or somthing.
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  #49 (permalink)  
Old 02-03-2010, 03:59 PM
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oops

sorry, I also forgot that it needed a cam and timing chain. I dont know about push rods so I guess I will just see when I call him back and if you guys say its a good idea.

EDIT-- Its funny how bad my memory is. I also forgot to say its a 1974 block.
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