Even with a set of RACE ported heads you just can't flow 400rwhp worth of air through any modular 2v. read that again so you really understand. YOU CAN'T FLOW ENOUGH AIR THROUGH A 2V TO SUPPORT 400rwhp NA. IT IS NOT POSSIBLE. not even with the most radically ported heads there are limits.
3v and 4v technically have the flow capabilities to do it at very very high rpm but those are not street friendly. FRPP managed to make a crate motor that's a 4v which does it but that's a RACE motor.
Get a realistic goal and we'll help you figure out how to get there.
Remember, hp is a measure of air pushed out the tail pipe for all intents and purposes, the 4.6L cylinder just isn't really big enough to do that at reasonable RPM or compression ratios and definitely not on a 2v head. If you want to spin 9k rpm and have no tq and no chance of passing a gas station unharmed, then we can get you close but not all the way there.
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