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  #1  
Old 07-21-2003, 12:13 PM
hill hill is offline
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Default heads&block

I know this has probably been asked a thousand times but i'll ask anyway. How good are the 452- 440 heads & what do these numbers on a 440 block tell us, & how good is it? 9-24-71 & 2536430-8 thanks.
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Old 07-21-2003, 12:25 PM
jelsr jelsr is offline
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The 452's are virtually the same as 906's and all the other late open chambered heads and also have the hard ex seat area. The 9/24/71 is the casting date. The 2546430-8 is an ID number. Both of these units (heads and block) are considered quality items.
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Old 07-21-2003, 12:32 PM
hill hill is offline
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tHANKS JELSR, YOU ANSWERED MY QUESTION.
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Old 07-21-2003, 03:25 PM
b-1ken b-1ken is offline
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The 452 heads have a flatter intake port than the 906 head and the exhaust port is better. That head is usually considered to be the best stock 440 head out there but there is really very little performance difference between them.
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Old 07-21-2003, 03:59 PM
hill hill is offline
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Thanks, b-1ken. Who do ya think makes the best valves for these heads, I 'll buy all new parts & was just wondering ,to be honest i don't know whats good or not, theres a dozen different brands.
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Old 07-21-2003, 05:26 PM
b-1ken b-1ken is offline
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I'd say Manley, in New Jersey.
732-905-3366
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