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The biggist difference between the SR and 440-1 head is the dog leg in the intake runner on the SR. The dog leg is elliminated on the 440-1 by using the off set rocker. Indy dosen't tell you this up front. How do I know this? A friend went with the SR heads last year and learned the hard way. He was a very unhappy camper.
if you say the correct words and know the secert handshake you can get an SR from indy without the pushrod divot machined in the head , requires off set rockers . the SR is the same basic casting as the 440-1 .
running up my post count some more .
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