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#1
01-03-2004, 06:50 PM
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I can't find a "4" or an "8" on my `77 6x heads...on the boss where I thought it should be. Could it be marked somewhere else?
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79 Firebird/`70 400 with `77 6x-4s shaved .065"/4 speed BW ST-10/Cliff Q-Jet/XE268/3.08 99 Trans Am/383 LS1/TSP headers and catback/custom grind cam/Vigilante 2500/Strano springs and Konis 08 Corvette - Base (SOLD) 75 Corvette/L48 350 (LSx -4L60E one day) -------------------------------------------------------------- |
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#2
01-03-2004, 06:50 PM
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I can't find a "4" or an "8" on my `77 6x heads...on the boss where I thought it should be. Could it be marked somewhere else?
__________________
79 Firebird/`70 400 with `77 6x-4s shaved .065"/4 speed BW ST-10/Cliff Q-Jet/XE268/3.08 99 Trans Am/383 LS1/TSP headers and catback/custom grind cam/Vigilante 2500/Strano springs and Konis 08 Corvette - Base (SOLD) 75 Corvette/L48 350 (LSx -4L60E one day) -------------------------------------------------------------- |
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#3
01-03-2004, 06:56 PM
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Search this subject. Identifying these heads has been thoroughly covered before including pics.
Les 66 GTO Coupe,455/trips,700r/2500stall,12bolt/3.08,1.79/13.01/104.5 68 GP daily driver and 2004 Route 66 Tour participant under restoration -------------------------- Better lucky than good
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Les Iden ---------------------------- '65 Buick Sport Wagon Custom, 340, T350, 3:23 '66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16) '68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold) '72 TA tribute/461, T400, 3.08, (Russ's as of 9-16) '97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed '09 Torrent GXP, nav, Sun & Sound pkg., Bilsteins |
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#4
01-03-2004, 07:01 PM
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looking at the head on the spark plug side. Look above the leftmost exaust port. right above it on an flange that sticks out. there will be a stamp of 4 or 8. its about 1/4- 1/2 tall.
ET 13.2 and spinning like a mother
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ET 12.504 MPH 107 3940 lbs |
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#5
01-03-2004, 07:56 PM
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I've found very weak stampings on several heads, so I suppose there could be some that aren't marked. Anyway, safe bet is to cc heads ,as that os the only difference, about .020 off the 4s as compared to the 8s, and who knows what 25 yr old head has been thru? Good luck.
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"The great obstacle to discovery is not ignorance...but the illusion of knowledge." Daniel J. Boorstein "Gas is STILL your cheapest thrill!" Your opinion of me is none of my business. |
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#6
01-03-2004, 10:32 PM
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I will try this for you. look above and left of the second head bolt hole, above and right of the 1st spark plug hole. there is a little ledge (on head pictured it has a little chip in it).
ET 13.2 and spinning like a mother
__________________
ET 12.504 MPH 107 3940 lbs |
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#7
01-03-2004, 10:33 PM
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opps I will try again
ET 13.2 and spinning like a mother
__________________
ET 12.504 MPH 107 3940 lbs |
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#8
01-03-2004, 10:34 PM
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here goes
ET 13.2 and spinning like a mother
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ET 12.504 MPH 107 3940 lbs |
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#9
01-04-2004, 12:45 AM
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http://www.boyleworks.com/ta400/psp/6XheadID.html
I also found this. ET 13.2 and spinning like a mother
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ET 12.504 MPH 107 3940 lbs |
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#10
01-04-2004, 04:51 AM
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Here ya go.
http://www.angelfire.com/fl4/pontiacdude428/HeadID.html And adding more info every month. Soon to be the most informative Pontiac and tech site on the internet.  ************************************************** *************************** Build it fast, build it right, build a Pontiac. http://PontiacDude.cc |
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#11
01-04-2004, 07:05 AM
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P Dude great info and glad to see something like that on here. Gave me some new ideas as far as if I want to ever build a low compression pump gas motor. Thanks
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
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#12
01-04-2004, 04:07 PM
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Thanks to all for the help. I used a mirror, flashlight and after a bit of cleaning - I saw a 4!
I can't wait to deck these down to say 80cc and stick `em on a 400.
__________________
79 Firebird/`70 400 with `77 6x-4s shaved .065"/4 speed BW ST-10/Cliff Q-Jet/XE268/3.08 99 Trans Am/383 LS1/TSP headers and catback/custom grind cam/Vigilante 2500/Strano springs and Konis 08 Corvette - Base (SOLD) 75 Corvette/L48 350 (LSx -4L60E one day) -------------------------------------------------------------- |
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