Discussion
My vxr8 ran 405rwhp at SRR on the weekend. Current mods are monkfish magic cam, slp high ratio rockers, fast102 intake, vcm otr, walkinshaw shorty headers, cats & bimodal exhaust. I'm thinking the next logical mod is the heads though i'm open to suggestions. I notice monkfish have some unused ric wood ported heads listed, would that be a good way to go or could I get significantly better gains going for an aftermarket head? Only real requirement is that i'm not looking for anything that delivers its improvement all at the top end, I had read up a bit on intake runner sizing and the like previously and I understand that has a major effect on how the power is delivered but any real world advice would be appreciated.
Thanks for the replies all. I'm actually in the US next week so I could pick up some aftermarket heads there. I had a look on the summit site and I can see they have a few options mostly TFS, AFR or chevrolet performance heads in various runner volumes. Would I be right in thinking for mostly street use a smaller running like 220 would be most suitable? And would the best bet be to buy a fully assembled head then sell on my heads complete with their high lift rockers and the like. Or would it be logical to buy a bare head and transfer those items?
Thanks for the input everyone, certainly a lot to consider. I had a look at the ls9 heads on jegs and I notice they do a ported version fully built as well at about $800 a head which is tempting. I'm not really able to get a definitive answer on whether ls9 heads are a bolt on to an ls2 either (different size bolts for one) and whether they'd also work with the fast intake. I have also seen suggestions that the ls3 head may be a better choice for NA. Perhaps the advice to talk directly to summit or such and ask them is the best way to go. I will be in the US in a couple of weeks so I could pop some in my suitcase for the return trip.
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