Radiator opening sizes

[mopar70]

Do 6 cylinder, small block and big block cars have different size openings in the front where the radiator sits?

 

[moparleo]

Yes. The biggest opening came on a/c cars.

 

[mopar70]

Well my engine guy told me to cut some metal off the sides cause its blocking some of the radiator. But I don't want to cut or modify anything.

 

[moparleo]

If you don't want to modify anything it ,what are you willing to do? Do you have a fan shroud ? Clutch type fan ?