[Drgnracin72]

Originally Posted by DiZzyBonne First you say it's cheaper to mod a 2 valve, but then you kind of contradict yourself saying it's easier to mod a 4 valve? Also, I know you need F/I, but at which point would the 4 valve be worth it?

how is that contradicting himself. the 2v is cheaper, but the 4v will make more power mod for mod. its breathes better therefor its gonna make more power. the 4v will always make more and be easier to make more than the 2v

[Drgnracin72]

theres a lot of somewhat wrong info in this thread. a 400 rwhp 4v is plenty streetable if set up right.

if a 2v and a 4v are both running 9 psi out of the same blower, the 4v is going to make more power hands down. boost is just a pressure reading. the 4v is simply taking in mroe air, even at the same boost levels.

the blocks on these cars are all the same. except for the difference of iron vs aluminum. both blocks are gonna ahndle more than you are ever going to throw at them.


if your power goal is only 400, then 2v is the way to go, itll be cheaper in the long run, but if your wanting 500 plus, 4v is the way to go hands down.


the b heads are the worst 4v heads out there flow wise.

[ReverendDexter]

Originally Posted by drgnracin72 a 400 rwhp 4v is plenty streetable if set up right.

I totally agree. However, when I said that a 400hp 4v wasn't going to be streetable, I was referring to a bolt-on only N/A car, and I would love to see an example that proves this wrong, as it will give me some ideas as to mods I can do to my car!

Originally Posted by drgnracin72 the blocks on these cars are all the same. except for the difference of iron vs aluminum.

If that's the case, than what's the big deal about the Teskid block? Or the Terminator block? Or are you just meaning that for a 400hp car, that it won't matter which block you have, as any of the 4.6L blocks will hold that much?

Originally Posted by drgnracin72 the b heads are the worst 4v heads out there flow wise.

Do you have empiricial data to back this up? It's been my understanding that the problem with b-port heads is that they flow TOO well for a 300hp motor, which is why they have the IRMC plates that restrict flow at low rpm. I thought the big advantage to the C port was that they restricted the flow somewhat, which increased the port velocity at low rpm, giving them considerably more V8-appropriate low-end torque.

[banned]

yeah, hes not coming off right about B heads, the b heads are the worst flowing stock, however they are about the best flowing ported, and almost equal flowing with imrc plates removed

[Trick Tuners]

If your goals are 400+ NA power then go with the 4 valve for sure. (and bump up the compression!!!)

[ReverendDexter]

Originally Posted by Trick Tuners If your goals are 400+ NA power then go with the 4 valve for sure. (and bump up the compression!!!)

What exactly would you have to do to a stock 4v 4.6L to get 400hp N/A? My understanding is that anything past the low 300s at the tires is going to require some sort of unnatural aspiration, so, at high drivetrain loss, we're still only talking 365hp or so at the crank.

[HBK_2007]

full bolt ons, p&p, cams, if 300 can be achieved with a sohc, n/a, then 400 can be achieved in a dohc, n/a. if you wait a little while and Doc will have the exact answer on how to do it

[ReverendDexter]

Originally Posted by HBK_2007 full bolt ons, p&p, cams, if 300 can be achieved with a sohc, n/a, then 400 can be achieved in a dohc, n/a. if you wait a little while and Doc will have the exact answer on how to do it

Yeah, I'm waiting for someone that has done it and dyno'd it. These cars do respond well to mods, but there's not as much you can do to a DOHC without resorting to FI or nitrous.

[HBK_2007]

well just wait till Doc gets done with his build

[bitemark46]

B-heads actually flow very well. Better that c (99-01) heads. Its just that with all that volume (twin ports) the air speed (aka velocity) is low. Combined with the injector only spraying into the primary port the air in the secondary port only gets to atomize with the fuel/air of the primary port in the chamber. By that time its too late. The fastest mod motor on the planet runs b-heads. You gonna tell him there are better flowing heads?

[Trick Tuners]

Originally Posted by ReverendDexter What exactly would you have to do to a stock 4v 4.6L to get 400hp N/A? My understanding is that anything past the low 300s at the tires is going to require some sort of unnatural aspiration, so, at high drivetrain loss, we're still only talking 365hp or so at the crank.

Stock, no way. Add some radical cams, port the heads and intake and bump the compression to 11+. If that does not do it, then bore and stroke it. Its not going to be very steetable and will require high octane.