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Anyone on here know if the Borla 2 1/4" upswept dragster headers will fit the Blue Thunder BBC Exhaust port. The Borla headers have a round port and the BT's have a square port. :shock: :?:
 

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They will bolt up and match the ports ok. But..... You will have to cut the flanges in order to get to the plugs. I did this with my old combo with Hooker upswepts.

A buddy of mine has the same BT heads as I do and he bolted on a set of Borlas like you ask about. He bought a new set of plug wires with 90° boots and then bolted the headers on. He can't get the plugs in and out. He reasoned that he only went throught about 2 sets of plugs per season (injected on alky) so he will just remove the headers to change plugs. He did use ARP studs/nuts to bolt them on so they can come off/go on pretty quickly.

Mine with cut flanges, I used a combination of chop saw, 3" cutoff tool and die grinder:
 
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