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Hey guys, I purchased the GM Performance zz454 and come to find out the lower head bolts get in the way of the header flange. The factory bolts are really tall and wide which won't allow my thick header flange to go in between or down into place.

Has anyone ran into this issue yet and would anyone have any suggestions?

I have called GM and they are not sure what woudl be a good replacement other than maybe something from ARP.

I called ARP and they say its a myth that their bolts will work, yet I have seen dozens of guys using the zz454 with nice thick flanged headers.

Any help would be greatly appreciated please.
 

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You may have to grind on the bottom of the header flange to clear the bolts.
 

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To me it looks like the headers not the bolts. ARP bolts are going to fit the same. Grind the flanges.
 
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