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If the engine is in original condition the valve covers were painted red on the 302C.

In the corner of the heads where you usually find a "4" or other identifying mark the 302C heads will have nothing at all.

Also, notice in the picture below the two casting "lugs" in the bottom edge of the head where the cylinder head meets the block that are circled in red. Only the 302C heads have this. If your heads have them and they are original to the engine then you have a 302C.
 

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Some 351 2 barrell also had red rocker covers
 

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Ohio XB said:
If the engine is in original condition the valve covers were painted red on the 302C.

In the corner of the heads where you usually find a "4" or other identifying mark the 302C heads will have nothing at all.

Also, notice in the picture below the two casting "lugs" in the bottom edge of the head where the cylinder head meets the block that are circled in red. Only the 302C heads have this. If your heads have them and they are original to the engine then you have a 302C.
Earlier model 302 heads have that feature but i have a set of E casting heads (80,s) which don,t have that feature.
 

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If it's in the original car, the compliance plate will let you know whether it's a 302 or 351. But, anything could have been done to it in the last 20+ years.

P = 302
T = 351

But, the only REAL method is the dip stick to confirm.
 

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you can see 351 written on the crank
you can tell if open or closed chamber by the notches in the head which if un touched is a good indicator.
 
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