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#1
10-31-2006, 11:24 AM
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i dont know what i have!!
ok i have a 1974 pontiac with a 455. but i dontknow if its a s/d h/o or what
how can i tell 
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#2
10-31-2006, 09:25 PM
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Re: i dont know what i have!!
whats the letters on the block? do you know where to look for them?
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#3
11-01-2006, 11:20 AM
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Re: i dont know what i have!!
its say y8 on the front but i found other numbers to that say zh?this throws me off
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#4
11-01-2006, 11:38 AM
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Re: i dont know what i have!!
y8. sounds like a 455. If its the original 74' motor than yes it would be An HO. The HO in 74 was either a "w8" or "y8". They both had 290HP. Same year 1974 they made these engines wich werent Ho but 250HP and below blocks
here they are: AU,YR,YU,YW,YX,YY,ZU,ZW,ZX,A4,Y4,Y6,Y9,Z4,Z6. Where did you find the numbers ZH. Whats the numbers on the side of the heads?
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#5
11-03-2006, 12:54 PM
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Re: i dont know what i have!!
the car looks almost identical to this except light blue interior its bored out 30 over and a 7.6 liter http://i23.ebayimg.com/05/i/08/d5/1a/d4_3.JPG
http://i6.ebayimg.com/02/i/08/d2/6d/4f_3.JPG http://i13.ebayimg.com/01/i/08/cd/73/f9_1.JPG?set_id=7 http://i13.ebayimg.com/01/i/08/cd/73/77_1.JPG?set_id=7
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