I'm making around a 1000 horse on my 421 turbo combo with 18 psi of boost, still using home modded factory iron heads and a flat tappet cam! I'm not using them just 'cos I'm a tight arse, there are benefits to an iron head. I'm turning the wick up this year shooting for around the 1200 hp mark, maybe 1400. I'd run out of my chassis tag if I fitted a nice pair of CV1's !
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