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Topic Review (Newest First)
02-03-2010 03:59 PM
handymann3
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.
02-03-2010 03:56 PM
handymann3
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.
02-03-2010 07:33 AM
handymann3
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.
02-02-2010 11:54 PM
cobalt327
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.
02-02-2010 11:30 PM
WDCreech
Quote:
Originally Posted by handymann3
Alright, I guess I will call these guys up and see what the deal is. How much hp do you think I will reach with the 400 done up with the heads you suggested with some .30 flat tops a nice cam, intake and headers?
With a stout hydraulic roller, or solid flat tappet cam, and a 700 or 750 cfm carb, you should get 430 to 450 hp. You'll need 3.73 to 4.10 or better gears to have a good bottom end.
02-02-2010 11:16 PM
handymann3
Quote:
Originally Posted by WDCreech
The secondary number that I gave (after the dash) are a stamped number on the verticle rib near the left side of the head. Look at the illustration that I posted. You may need to clean it off with a wire brush to beable to read it.
Alright, I guess I will call these guys up and see what the deal is. How much hp do you think I will reach with the 400 done up with the heads you suggested with some .30 flat tops a nice cam, intake and headers?
02-02-2010 11:11 PM
WDCreech The secondary number that I gave (after the dash) are a stamped number on the verticle rib near the left side of the head. Look at the illustration that I posted. You may need to clean it off with a wire brush to beable to read it. Heads from a 455 will have too big of a combustion chamber for a 400. A 350 smog head would work best.
02-02-2010 10:53 PM
handymann3
Quote:
Originally Posted by WDCreech
The '74 block will be good to about 700+ hp. Your best bet for heads are '73-'74 #46s (screw in rocker studs), #4C-5 (pressed in studs), '75 5C-4 or 5C-7 (screw in), or '75 6X-4 or 6S-7 (all had screw in studs after a B215 casting date). This is where to find head specs: http://www.wallaceracing.com/headsearch.htm
Thanks alot, I will keep a eye out for any of these heads. The only engines I can find are 74's-75's. I uses the link you send and it showed every ****in head eccept the ones you mentioned. I came up with:

. 4c
. 4x (screw in stud)
. 5cx
. 5c
. 6s

Are any of these heads good? I was just punchin in 1974 and 1975 400 blocks. Should I look at the 455's as well?
02-02-2010 10:26 PM
WDCreech The '74 block will be good to about 700+ hp. Your best bet for heads are '73-'74 #46s (screw in rocker studs), #4C-5 (pressed in studs), '75 5C-4 or 5C-7 (screw in), or '75 6X-4 or 6S-7 (all had screw in studs after a B215 casting date). This is where to find head specs: http://www.wallaceracing.com/headsearch.htm
02-02-2010 10:10 PM
handymann3 alright let me see what I can find out. Once again its a add on kijji so I will just give the guy a call tom.
02-02-2010 10:07 PM
cobalt327 Look for another identifier on the 6X heads to tell you a bit more about them- they came in several different chamber sizes.

The 4, 6, 7, 8, and 9 identifiers can be found stamped on one of the vertical ribs on the side of the head.
  • 6X-4 93cc (mine measured 95cc that I had on a 455), they came on mid-'75-'77 350ci; '77-'79 W72 (TA "6.2 Litre" option) 400ci.
  • 6X-6 124cc
  • 6X-7 93cc
  • 6X-8 101cc
  • 6X-9 101cc

6X heads have hardened exhaust seats, screw-in rocker studs and guideplates, 2.11" intake x 1.66" exhaust valves.

There are also 1973-'74 cast #4X heads w/98 cc chambers and screw-in studs.

I'd avoid the '70 #16 heads- they are not a good HP choice, they have small valves and might even have pressed in studs.

There is more in a thread HERE, as well as other info on this forum- hit up the search for 'Pontiac 400', etc.
02-02-2010 09:58 PM
handymann3 Sorry Its a '74 block. I cant get the cast #s because I am looking at it on kijji. I think from what I here that the 74 will be ok. I just need some help on the cyl heads and cam now. Any suggestions?
02-02-2010 09:51 PM
WDCreech
Quote:
Originally Posted by handymann3
Forgot to say that This is most likely going on a '75 block
A '75 block, if cast early enough, would be a good block. Give us the castin number of the block, shown below, and post it on here, and I'll tell you if it has the the thin main webbing. It will be either 488986 or 500557. If it is the 557 block, it would only be okay for mild street use. If it's the 986, you're good to go!
02-02-2010 09:45 PM
handymann3 Sorry once again, I ment to say '74 block
02-02-2010 09:36 PM
handymann3 Forgot to say that This is most likely going on a '75 block
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