Indy Cylinder head sells them. Made by ARP, they're the same ones that fit -1 and SR heads. Part # 440 - H4 - 1712. Personally I've had no issues dealing with Indy but it is a rare occasion. I normally deal with Indy through a 3rd party Vendor (Marsh Performance) Todd will supply you with anything you need http://www.mopartsracing.com/
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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