Quote Originally Posted by tateos View Post
Q:

Has anyone successfully replaced a 4.0L in an Olds with a 4.6L?
Yes it's been done!

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Quote Originally Posted by 89falcon View Post
I'm sure it's been done....and I'd do it before changing cams..."no replacement for displacement"......and the 4.0 and 4.6 actually use the same cam grinds (9 engine).
Of course VIN 9 4.6 northstar engines have larger intake cams, hence why they make more power. It kicks butt in my aurora too!!!!