Discuss possibility of a 2 valve making 350+ RWHP N/A
 

Think of a build that consists of big bore not stroked. The block is going to be a machined and sleeved Teksid at 324 C.I. and filling it with 03-04 cobra take outs. The pistons are going to be 11cc dished, supposed to make 11.5:1 compression with PI ported and polished heads. The cam will be custom which will maximize the heads intake and exhaust flow numbers. The intake manifold is going to be one from a Bullitt mustang and Im unsure if it will be ported or not.

Im just not convinced this motor will cut 350 to the wheels without being spun to 6500-6800 RPMs...The max RPM intentions on this motor are not yet clear nor givin. I know I wouldnt run 11.5:1 compression on pump gas at close to 7k rpms.

I have limited exp...but maybe some of you may have seen some 2 valves make 350+ hp N/A.

With the trick flow heads it's a non issue not sure about the ported pi's though

I'm sure the Trickflow 40cc version off the shelf will cut 400rwhp no problem.

I think you're going to see it very soon. I believe the 350 rwhp has already been done.
I know we are talking about these Trick Flow heads as being the greatest thing since sliced bread but its a step in right direction.

There is a lot of smart people out there that will take these heads and make them better and matched with the right cams and intakes (as you said) 400 will be a reality.

R3d said he thinks that 281 ci will not be enough to produce this, I dont know? Stroker kits yea! Its gonna be fun!

I want to emphasize more on doing this with PI heads not trickflows new design. I really havent seen any N/A numbers or havent looked for any.

I'm sure a 4.6 based block has made 350 N/A horsepower and im sure one has even hit close if not over 400. For a street car I dont think a high rev'ng motor is going to be as fun as a stroker or 330 build.

i dont see how 7k rpm can be made safely with a 2v.. i figured youd need 4v to make that RPM but then you would be pushing tons of power over 350 after u got done.

it's been done on PI heads with a race port and some nasty cams. You have to run them up to pretty high rpm no matter what to see that kind of power. 7K rpm is tall but not limited to 4v. You just have to make sure the heads will flow there and your cam is ground for it.

With TFS heads, you can do it on reasonable compression and cam timing but you still have to spin it pretty high to do so. 5.4's do it 1000rpm sooner. A big bore (3.7") would make it much easier to do on PI heads.

If my heads were not the crap they turned out to be my car would have slapped down 330 and a couple degrees of retard on the cam timing would have probably let me spin it to 350rw.

Porting the TFS heads on a 4.6 I think might end you up with a very high strung motor. On a 5.4 you'll end up with a 6K rpm tq monster.

oh it's possible. (link to the guys that produced it: http://www.popularhotrodding.com/tec...ine/index.html )


you have to use a Carbeurator conversion kit, port the PI heads, add some good cams and long tubes, but it's very possible.

It's been done by a guy here locally. He has TFS heads with VT/CMS Stage 2 cams. Made 355rwhp/349rwtq with the stock plastic intake on the car. I believe with cams that are actually matched to the heads, and a better intake, he could make 265-270rwhp at least. This is through an automatic also, so numbers on a 5 spd car would naturally be higher.

Has anyone been using the TFS Track Heat intake manifolds?

outside a blower application they're not really that popular.

350+rwhp on a 2V isnt impossible at all but it's going to take a lot of work and adjusting to get there. Generally speaking, people have been making more power than that off 2V's for a long, long time. I would absolutely go with a fuel injection setup and the best heads (trick flow) and biggest cams you can get and an expert tune. Port and polished heads, port matching intake and exhaust, bowl blending and a serious valve job for the heads...head work is essential.

Spinning to 7,000rpms? No problem, you have to have the setup for it. You're gonna need billet I-beam rods, cams designed for 7k+ and springs that will allow you to spin up to 7k.

Lastly, if you really want that kind of power and dont want to spend a bunch of money getting there with an N/A setup...get a turbo/supercharger and call it a day. My 2 cents...

I just dont think its worth the trouble to have such a volatile set up for a weekend street warrior. I'd rather keep an octane safe boosted 2 valve.

What is your budget?

check out latest issue of 5.0&SF. They made almost 350 RWHP using a stock bottom end, TFS heads and cams, 75mm TB and plenum, CAI, longtubes, exhaust, 24lb-hr. inj., and a tune. With a built bottom end, more aggressive cams, and a really good tune, you could probably make 400RWHP out of a 4.6 now. Course, for the same price, you could apply the above to a 5.4 and probably easily make 400RWHP, with insane torque. Just saying.

this isnt my plan...

someone is building this thing up and will be using Ported PI heads not TFS 38cc heads.

Hi R3dn3ck. I am really interested in this swap as a potential low-buck venture. My question is, what is the practical rev limit on a factory 5.4? Would a factory 5.4 spin high enough to make use of a hardballr, heads and cams (something like 274/278XEH)? Talking about a 5-spd application, so no torque converter issues.

Phrased another way, would the long stroke / extra volume of the 5.4 allow the motor to make use of heads / cams / intake at practical engine speeds for a stock shortblock (perhaps with room to grow when budget allows for a forged motor)?

I would go with a better cam but the intake was designed to work at normal rev ranges so yeah, it'd be a nice low buck combo. < 6000 rpm.

PI heads are the limitation due to flow. TFS heads can support spinning it a good bit higher. The 5.4 bottom end in factory trim should stay under 6K rpm.