I wouldn't use the 1262 unless your going with big heads and intake. Here are some dimensions of gaskets and the stock head and lower intake opening at the head. Fel Pro makes two kinds of gaskets for the 5.0 - one is the Printo Seal 1250 gasket and the other is the Blue Stripe that comes in their MS93334 gasket kit. Here are their dimensions:
1250 Printo-Seal = 1.2" x 2.0" = 2.4 sqin
1262 Printo-Seal = 1.28" x 2.10" = 2.688 sqin
MS93334 Blue Stripe = 1.15" x 1.95" = 2.25 sqin
Stock Lower intake opening = .875" x 1.675" = 1.46 sqin.
Stock E7 head opening = 1.05" x 1.90"
In most cases the 1250 gasket size works best.
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Tom (Torque) Moss
88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE).
http://www.fastlanecars.com/
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