6-x heads

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6-x heads

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Pontiac >> A BLAST FROM THE PAST >> Muscle >> 6-x heads

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6-x heads - 2/14/2008 7:22:18 PM

warrior697

Posts: 1
Joined: 2/14/2008
Status: offline

iv got a pair of 6-x heads. 1 is a 6-x(8) and 1 is a 6-x(4). i want to put these on my 455. should i get machine work done on these so they both have matching cc's? i was thinking around 80cc?

Post #: 1

RE: 6-x heads - 2/21/2008 6:58:50 PM

cppainter

Posts: 24
Joined: 2/21/2008
Status: offline

6x heads are great for a 455, one was a 350 head, and one was a 400 head, so they are different, i cant remember if the 4 or the 8 was a 350. i would get a matched set and deffinitly get them checked for trueness before i put them on. also make sure your intake is correct for your heads. the exhaust cross overs on some heads are open and some are not. again i cant remember which is what, but your machine shop will know. if you dont do that you will have a leak at the center of your intake. wallace racing should help, they are pretty knowlegeable on heads, a 4x with a 4 stamp would be better, a 7m5 72 head would be best

(in reply to warrior697)

Post #: 2

RE: 6-x heads - 5/23/2008 11:07:53 AM

prh555

Posts: 2
Joined: 5/23/2008
Status: offline

i have a set of bare heads off a '74 455

prh

(in reply to warrior697)

Post #: 3