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Old 08-28-2011, 11:40 PM   #1
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Whats the big diff?

Speaking about 351 windsors hear ive heard to try and go for pre 75 blocks or casting codes c9 to d5 but no one has been able to tell me y yet...

This question arrized because of anouther descoussion i was ingaged in about cams and turns out the ford racing cam f303 can be used for late model 302w's as well as 76up 351w's and it struck me as odd is all anyone care to bite?
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Old 08-29-2011, 11:07 PM   #2
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Out of all the know it alls on this forum no body knows the diff??
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Old 08-30-2011, 06:42 AM   #3
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Quote:
Originally Posted by Hawk
Out of all the know it alls on this forum no body knows the diff??
The difference is the valve sizes. The c9 heads were used from 69-74 and had 1.84 intake and 1.54 exhaust valves. The d5 heads were 75-77 with the same size valves. After those years they used the same heads as the 302.
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Old 08-30-2011, 09:13 AM   #4
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Its got to be more then that i mean ive told many ppl im putting aftermarket heads on and they still say to go with the earlier blocks but if it is only heads ha im laughing i can get a late model core for 25$ and start putting stuff in( accually i couldnt find a diff so i allready bought it just wanted to make sure i made the right choice)
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Old 08-30-2011, 02:31 PM   #5
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Did a little research, the 69-74 blocks were thicker in some parts making them stronger than later blocks.
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Old 08-30-2011, 06:05 PM   #6
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Ok wonder now ill have to dig a little more my self then
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