Choosing a Head

[Luposlipophobia]

Yes, I have driven an '07 M5 on the track a few times and Z06 twice. I was definitely going to let a pro build it for me. Tolerances for something like this are not forgiving enough for me to attempt it myself. The 4.5"x4.5" square is definitely attractive, however, what are the advantages/disadvantages of going forced induction vs larger displacement?

[Silverback51]

I thought the 460 aluminum block was a dry block for racing only. If you have found a wet 460 aluminum block let me know. I will be building a new engine next Winter.

Also, you did not mention a Compression Ratio. If you are going with a boosted engine, I would limit the C/R to 7 or 7.5 to 1 and then run more boost. For the same cylinder pressures, you will get greater HP from the lower C/R setup.

[blykins]

For sane horsepower levels, $4000-5000 blocks are not necessary.

The biggest disadvantage for going forced induction on something like this is that 1. You don't need it for the horsepower levels that you're looking for (it's not a small block) 2. The cost. You're probably going to double, if not triple, your engine budget with two turbos/superchargers.

Getting 800hp out of a P51 headed 557 isn't terribly hard at all.

I still don't know why you have to have 800hp.....that's not streetable. Anything above 600hp in a street car is pretty much a dice throw anyway. You would never be able to take advantage of a wide open throttle situation.

IMO, 700-800 is for drag racing, not street driving.

You could build a 600-625hp 460 for pennies compared to what you're trying to plan.

[barabar]

Trick Flow are the best for the price. SCJ heads are good too, but there is a valve spring issue with solids. I perfer the valve spring on the trick flow. This is out of the box, with no mods. A hyd roller is good to use with either head. Yes you can make 700 hp and still be very street-a-ble on pump gas. 9.5 to1.
BBF let them breathe and they can make phenomenal hp.