Ditto on the 9 lb cap. Pressure check at the store before you buy. I have seen 9 lb caps differ by +/- 4 lbs.
Even tho I have a new aluminum radiator that can go as high as 16 lbs. I still like the 9 lb cap.
Scott.
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Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
installed MSD Atomic EFI
Houston, Texas