1.7 roller rockers might be worth a couple HP depending on the cam/head and intake flow capability - if a little more lift will give more power, then 1.7s could be a good move. I'd run rollers if I could on any motor - even 1.6 ratio.
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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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