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Old 02-25-2013, 09:10 PM   #1 (permalink)
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Default classic 302 boss engine

hey everyone. quick question. i know about the freeze plugs and heads. but is a vin stamped on a boss block like a 289 hipo? looking at a car tomorrow and he says the car has a real 302 block in it. the pic he sent me is not the best but it looks like boss valve covers r on it.
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Old 02-25-2013, 09:25 PM   #2 (permalink)
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unless its a service block it will have the vin. lots of 69's got the sevice block under warranty after the piston skirts cracked.
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Old 02-25-2013, 09:26 PM   #3 (permalink)
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If it has the screw in then you can be sure it is a boss or 427 engine. The size difference will tell you it is a boss 302. Vin stamp is on bottom of block but I am not certain that vin is visible with oil pan on. Heads have part numbers that you have to confirm also. There are reports of not all vins being stamped on engines but I doubt it is true b/c it was required by law. If it did happen, then it would be a rare occurance.
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Old 02-25-2013, 09:30 PM   #4 (permalink)
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BTW, lots of people say they have a boss 302 in the car but dont have them.
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Old 02-25-2013, 09:34 PM   #5 (permalink)
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Oh and there are 8 bolts holding down valve covers.
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Current piles of rust 1965: New yorker***1968: GTO convert, Lemans convert Porche 911***1969: MustangGT convert, Mach1 S code Mach1, Mach1 CobraJet R code GTO convert, Firbird Convert 1970 Boss 302***1972: Charger***1999:f250 CNG truck***2011:nissan Altima --->get rid of some of this junk lol
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Old 02-25-2013, 10:13 PM   #6 (permalink)
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all 351c heads have 8 bolts,so in theory someone could have but 351c heads on a 302
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Old 02-25-2013, 10:48 PM   #7 (permalink)
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Very true. These are the head casting numbers. 1969 - C9ZE-6090-A or C 1970 - D0ZE-6090-A or B servicereplacement : D1ZE They are located under then valve covers though.
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Current piles of rust 1965: New yorker***1968: GTO convert, Lemans convert Porche 911***1969: MustangGT convert, Mach1 S code Mach1, Mach1 CobraJet R code GTO convert, Firbird Convert 1970 Boss 302***1972: Charger***1999:f250 CNG truck***2011:nissan Altima --->get rid of some of this junk lol
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Old 02-26-2013, 06:13 PM   #8 (permalink)
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well after looking over the engine it looks like it has boss heads on it, but the engine looks to be just a regular 302. was hard to see because the engine is in a 65 mustang but it looks like the engine did not have screw in plugs. heads r D1ZE90AA
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Old 02-26-2013, 06:29 PM   #9 (permalink)
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Boss 302 head casting numbers are:

1969 - C9ZE-6090-A or C
1970 - D0ZE-6090-A or B

Which figures. It doesn't make much sense to put actual Boss 302 cylinder heads on a regular 302 block. Any set of 351 Cleveland 4V heads will be nearly identical. You need only add screw-in rocker studs and pushrod guides. (OK, the intake valves on the '69 Boss 302 heads were slightly larger. But that's still not a reason.)

Actual Boss 302 heads are very valuable to someone restoring a Boss 302. For anyone else, it's a waste of concours casting numbers.
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Old 02-26-2013, 06:46 PM   #10 (permalink)
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I thought d1z r also codes for boss heads?
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Old 02-26-2013, 07:00 PM   #11 (permalink)
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I don't think so. I just checked the Boss 302 registry. They list a "D1ZE" which was for the cancelled 1971 Boss 302.
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Old 02-26-2013, 07:04 PM   #12 (permalink)
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Quote:
Originally Posted by snakebite8 View Post
heads r D1ZE90AA
I can't find any reference to that casting number. I'm thinking you weren't able to see it clearly. But I'm pretty sure it's a 351 Cleveland casting number.
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Old 02-26-2013, 07:05 PM   #13 (permalink)
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This is a 70 boss 302 with a H&M dual quad intake and some other aftermarket stuff
Attached Images
File Type: jpg 831.jpg (83.4 KB, 38 views)
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Old 02-26-2013, 07:15 PM   #14 (permalink)
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No i have a pic of the code . I will post in a little bit and it has d1z
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Old 02-26-2013, 07:18 PM   #15 (permalink)
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I went on the boss reg and the last pic has a heads from 1971 boss 302 with dize
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