motor build question
4.6L Section Moderator
Joined: Nov 2007
Posts: 10,286
From: South Central PA
Well...there are guys out there doing very well with these heads already. They love timing and they need big cams to reach full potential. Stage 2 cams really wont reach the full potential with these heads so you need to step up to a bigger cam and spin the thing to 6500+rpm. With these heads, they shift the powerband WAY up...like into 4v territory rpm's. So theres the added rpm. There are already people making over 350rwhp with these heads. There are already people making close to that with regular ported PI heads. Its not that uncommon to see power numbers in excess of 330rwhp anymore n/a, especially with the TFS heads. Then you get them things ported...and youre even higher in RPM and flow so you get even more power there. I'd like to find the thread that i saw on SVTP of guys with 4v's making 500+rwhp. I just cant find it for the life of me. But believe me, you can make over 350rwhp with the TFS heads on a 2v.
2nd Gear Member
Joined: Sep 2007
Posts: 165
From:
You don't need to spend "serious" coin anymore to get 350 rwhp out of a 2 valve anymore. Read this link http://www.modularfords.com/forums/s...d.php?t=139918
This member is making 350rwhp with the tfs heads on a stock block and on pump gas! (he was at 355 prior but lowered it with a slightly smaller cam). And that is with the stock pi intake and thru an automatic. If it was stick, it would be in the 370ish region. So to answer your question, you CAN make 100rwhp more w/out spending "serious" coin. Their is no big bore or nasty cams (just stage 2 cams)
This member is making 350rwhp with the tfs heads on a stock block and on pump gas! (he was at 355 prior but lowered it with a slightly smaller cam). And that is with the stock pi intake and thru an automatic. If it was stick, it would be in the 370ish region. So to answer your question, you CAN make 100rwhp more w/out spending "serious" coin. Their is no big bore or nasty cams (just stage 2 cams)
Obviously they do. Four valves take up a lot more room than two valves.
Now with a big bore, high compression, forged bottom end, high revving cams and intake manifold, ported tfs heads, people have already made 520 at the flywheel, which is about 440rwhp (that was confirmed to me by Ron at Fox Lake Racing). Their will be a better version of the heads, the R edition, that are said to flow at around 280cfm. So their will be more room to grow. But back on topic for the OP, I say go with tfs heads, long tubes and cms stage 2.5 cams and you'll be in the 360rwhp range.
Also, the problem with running domed pistons on these motors is that when you're building an N/A motor with big cams, you can't get too big of a dome because you run the risk of the valve smacking the piston. Then you have to get valve reliefs, etc.
And I doubt there are a lot guys making high 400s on pump gas with an N/A 4v. Race gas, yeah, but not pump gas.
I mean, look at your car. You're making 250 to the wheels. Do you honestly think that you can get another 100 RWHP out of your motor n/a without spending some SERIOUS coin? I don't. A big bore, nasty cammed, hogged out heads, intake of your choice won't get you more than 375 to the wheels on pump gas in a 2v. To see an additional 100 out of a 4v on pump gas n/a is a long shot and not many people do it.
Now with a big bore, high compression, forged bottom end, high revving cams and intake manifold, ported tfs heads, people have already made 520 at the flywheel, which is about 440rwhp (that was confirmed to me by Ron at Fox Lake Racing). Their will be a better version of the heads, the R edition, that are said to flow at around 280cfm. So their will be more room to grow. But back on topic for the OP, I say go with tfs heads, long tubes and cms stage 2.5 cams and you'll be in the 360rwhp range.
Also, the problem with running domed pistons on these motors is that when you're building an N/A motor with big cams, you can't get too big of a dome because you run the risk of the valve smacking the piston. Then you have to get valve reliefs, etc.
And I doubt there are a lot guys making high 400s on pump gas with an N/A 4v. Race gas, yeah, but not pump gas.
I mean, look at your car. You're making 250 to the wheels. Do you honestly think that you can get another 100 RWHP out of your motor n/a without spending some SERIOUS coin? I don't. A big bore, nasty cammed, hogged out heads, intake of your choice won't get you more than 375 to the wheels on pump gas in a 2v. To see an additional 100 out of a 4v on pump gas n/a is a long shot and not many people do it.
Last edited by GT2ENVY; Feb 24, 2010 at 11:14 PM.
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