Would like to know more about this option too. My 65 has a 326 2bbl. Bought a 4 bbl manifold & carb for a 65 GTO on eBay & air cleaner from Jerry H. To turn my car into an HO. I have a tech sheet that shows the 2bbl engine code is WP or YN with a 9.2 -1 comp. ratio & the HO.is WR or YP with a 10.5-1 comp.ratio. Maybe different heads? But I would like to know more about this option. Thanks Saltman.
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1965 Lemans Vert
1968 Shelby GT 500 KR
Last edited by saltman 1965; 12-08-2013 at 11:49 PM.
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