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The Chevy small block 305 was the work horse for GM in the 80s.
It was used in Z28s for quite a few years. Here's what they managed to get out of them:
1982 Z28 5.0L (305CI) -165hp(CFFI)
1983 Z28 5.0L - 190hp(4bbl High Output Carb)
1984 Z28 5.0L - 190hp(4bbl H.O.)
1985 Z28 5.0L - 215HP(Tuned Port Injection)
IROC-Z 5.0L - 215HP(TPI)
1986 Z28 5.0L - 190HP(TPI *new emmissions requirements)
1987 Z28 5.0L - 215HP(TPI)
I think with ported heads and a good cam you might be able to get 280HP out of it. Try asking third gen owners about them. I'm sure they can provide much better insight.
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2005 MN6 Cyclone Grey GTO
Stock: 337.0rwhp,332.8rwtq @8.2k mi
*previous car*
2002 A4 Rally Red SS Camaro
Stock:CME,Bilstein,Auburn,T-Tops,Chrome ZR-1s,BFG g-Force KD 17",SS Grille,Deck Mat,& Floor Mats
306.9 rwhp,325.8 rwtq @ 6.4k mi
Mods:SLP_LID,Airhog,LS6cam+springs
338.0rwhp,336.8rwtq
SLP_Bellow,TBB,BMR STB&LCA
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