Glad I kept that much maligned 'POS' Streetmaster I ran on 30 over 390, 600cfm Holley 0-6919 smog legal vac. secondary. Yes, gas mileage was 11-13, no B.S.
E'boc's literature accompaning that manifold caution its use on a 428 without 'modifying' ports. So it has been shelved for years.
Now I want to try it on 428 (+30) w/735 Holley
Thanks for all your effort and information.
This Forum and members are amazing!!
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