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#1
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4X heads/Date Codes
I have a pair of 4X heads with date codes of what appears to be H152 and G272. What do they belong to and what are the date codes? Thank you!!!
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#2
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July 27th 1972 Casting
August 15th 1972 Casting They would prob be on a 1973 model car. Check the ends of the bosses on each head. You would have 1h,4h,3h or 7h as a secondary code. That will tell a lot about what exact engine and trans they came on..
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Nothing is impossible if you break it down into possibilities. It's all a matter of "Want to". |
#3
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455 Correct?
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#4
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See this site...
http://www.wallaceracing.com/head1.htm |
#5
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1h is a 455 4bbl auto
4h is a 400 2bbl auto 3h is a 400 4 bbl auto 7h is a 400 4bbl 4 speed. 98-112cc's most all have screw in studs after march or so of '73. Only the 3h and 7h will have screw in studs prior to march.
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Nothing is impossible if you break it down into possibilities. It's all a matter of "Want to". |
#6
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Thanks guys!
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#7
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There was a 7 stamped on the horizontal underside of the bossing on both heads, no H however? Are these worth anything to anyone? I assume they are from a 400 4-spd 1973? I got them with a car purchase last year, just never checked them out!
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#8
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Quote:
This is a 4X 455 head...1H.
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Nothing is impossible if you break it down into possibilities. It's all a matter of "Want to". |
#9
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That's where the 7 is, but I don't see an H. There is surface rust however, but the 7 sticks out like a sore thumb!
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#10
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Its a 400 head for sure then...are you selling them?
__________________
Nothing is impossible if you break it down into possibilities. It's all a matter of "Want to". |
#11
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Yes, I will put them up for sale for anyone interested!
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#12
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The following are 73-74 heads
4X-1H uses 4.881/4.870" valves 4X-1H are 455 head with 114cc, 2.11/1.66" valves and pressed studs. 4X-3H are 400 4bbl head with manual transmission, 98cc, 2.11/1.66" valves and screw-in studs. 4X-4H are 400 2bbl head, 1.96/1.66" valves and pressed studs. 4X-7H are 400 4bbl with auto trans, 98cc, 2.11/1.66" and screw-in studs. 46 are 350 2bbl/4bbl heads with about 86cc, 1.96/1.66" valves and pressed studs. 4C-5 are 350 with AIR, 1.96/1.66" 86cc, pressed stud. 4C-9 are 400 with AIR, 1.96/1.66", 98 cc, pressed stud. Is this info correct for these heads???
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1974 400 4 speed Last edited by TransAmRIP; 04-11-2009 at 04:28 PM. |
#13
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Quote:
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#14
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Bub,
Sorry if you think I mislead you. At the time I was going from Rockys article. http://www.highperformancepontiac.co...ads/index.html But lately, I have just about decided that all the 7h heads I have dealt with have slightly smaller chambers. Most around 98cc's. Seems the 3hs average about 102-103cc's.It would make sense that the 4 speed cars would get the smaller chambers. Its just my observation.No need to sell your heads. Rocky knows his stuff for sure.
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Nothing is impossible if you break it down into possibilities. It's all a matter of "Want to". |
#15
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Quote:
or if I would need to change to something else to match my engine Thanks for clearing it up, Bub.
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1974 400 4 speed |
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