An affordable n/a, 400rwhp recipe

[na svt]

We (Apocalypse Performance/TW cams) were approached by Engine Labs online magazine to spec a build for a n/a cobra that would see street and road race duties. The goal was to develop and engine that would run on 93 octane, be very affordable, live a long life and be a hell of a lot of fun to drive. We think we met all the goals, the car got 413whp & 366tq out of this little 4V, NA 284ci combo. The setup has unported heads, stainless valves, 10" runner intake manifold, 11:1 compression, and 1 3/4" headers, and custom cams.

The dyno was a dynojet and as you can see SAE factoring was used.

Project Engine Boring 4-Valve – EngineLabs

The Boring 4-Valve is a 2003 Mach 1 engine that Ivan Korda got for a steal (the exact words we had for him when he first mentioned it to us were, “You’re on the way to pick it up, right?”). We had

www.enginelabs.com

 

[98 svt]

Heyyyy.... Where ya been. Don't be such a stranger over here. Not all of us have Bookface.

 

[shurur]

Nice to see the much maligned WAP block was used!

Great info on the header diameters and what they give and take. This should end all the disputes.

And this was done without oversized exhaust valves!!

I plan to just do the NASVT Recipe and stay in the OEM RPMs...someday.

Moved to a Mach1 lower intake, as my 99 was unrevised and have the set of March UDP/Damper minus the ALT pulley, which I am replacing with a smaller 2" (49mm) pulley to keep the alternator spinning at proper RPM.

I just want to enjoy each little mod a bit at a time..old-school.

 

[shurur]

Now I am wondering what a 3.7+ Stroker would make with these mods...or a BB Stroker...!!

Would be nice to hear what she sounds like with those custom cams!

 

[Dave.O]

By stock heads I would assume no port/polish. Did they have a valve job, any change in seat contouring or angle?


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[na svt]

By stock heads I would assume no port/polish. Did they have a valve job, any change in seat contouring or angle?


Sent from my iPhone using svtperformance.com

Nice to see the much maligned WAP block was used!

Great info on the header diameters and what they give and take. This should end all the disputes.

And this was done without oversized exhaust valves!!

I plan to just do the NASVT Recipe and stay in the OEM RPMs...someday.

Moved to a Mach1 lower intake, as my 99 was unrevised and have the set of March UDP/Damper minus the ALT pulley, which I am replacing with a smaller 2" (49mm) pulley to keep the alternator spinning at proper RPM.

I just want to enjoy each little mod a bit at a time..old-school.

WAP blocks are commonly used for high hp n/a builds as well as boosted setups under 1000hp.

There is never a need for oversize exhaust valves.

 

[na svt]

Now I am wondering what a 3.7+ Stroker would make with these mods...or a BB Stroker...!!

Would be nice to hear what she sounds like with those custom cams!

bb/s would be at 500hp while a stroker or big bore will be around 460. Those numbers would be for 7000rpm setups. 550rw with a high RPM big bore is doable.

 

[shurur]

WAP blocks are commonly used for high hp n/a builds as well as boosted setups under 1000hp.

There is never a need for oversize exhaust valves.

Good to know.
I thought at one time that was recommended, to make exhaust valve 0.9 of the intakes.

 

[shurur]

na svt...any plans to start producing your own intakes?

 

[01yellercobra]

Now I am wondering what a 3.7+ Stroker would make with these mods...or a BB Stroker...!!

Would be nice to hear what she sounds like with those custom cams!

FWIW, my big bore stroker made 360-370hp N/A even though it was built for boost. Stock 03 heads, stock 01 intake, Ford GT cams, 9.5:1 compression, and mid length headers. Another 1.5 points of compression really would have woken it up.

 

[FIREBALL]

I would like to see N/A with just 350 rwhp that can pass Calif. Smog

 

[shurur]

I would like to see N/A with just 350 rwhp that can pass Calif. Smog

The standard na svt recipe for OEM will get you that. It is that list I made from na svt quotes across the net and was ok'd by him.
Na svt has cams that you should be able to swap out.

The recipe in this thread is a REBUILD RECIPE with more compression, deeper fly cut flat-top pistons, more duration...a recipe for doing and optimizing an NA BUILD.

 

[biminiLX]

Very nice.
-J

 

[SID297]

bb/s would be at 500hp while a stroker or big bore will be around 460. Those numbers would be for 7000rpm setups. 550rw with a high RPM big bore is doable.

Long time, no see. Don't be a stranger.

 

[52merc]

I love the idea staying NA. At times I think, "Anyone can bolt on a supercharger kit and make power, but it takes real work to make power NA". Then I remember I live at 3,000 ft and think, "Got to go FI". This article isn't helping me.

Great article Warren, thanks. I don't do FB either.

 

[FIREBALL]

The standard na svt recipe for OEM will get you that. It is that list I made from na svt quotes across the net and was ok'd by him.
Na svt has cams that you should be able to swap out.

The recipe in this thread is a rebuild recipe with more compression, deeper fly cut flat-top pistons, more duration...a recipe for doing and optimizing an NA build.

Thanks but I guess there is no hope without having to take the engine apart.-- but where is there a link for standard NA recipe and that can pass california smog?

 

[shurur]

Thanks but I guess there is no hope without having to take the engine apart.-- but where is there a link for standard NA recipe and that can pass california smog?

I don't want to post it in this thread to avoid confusion.
Search nasvt recipe, and look for the latest threads. I have posted it many times. It is just a list of the effective bolt-ons and cams.

Make a new thread in svtp.

You can contact na svt Todd Warren or post up on his FB page as well.!!..then start by posting up there.

Apocalypse Performance

https://m.facebook.com/groups/481330828691064/

You need to request to join.

 

[Badaz01]

413 on a dyno jet I wonder where it would land on a mustang dyno? I want to run mine in a dyno jet one day to see. I got to 310rwhp on my na build and that was with every bolt on possible without getting into any heads or engine internals. That number was also on a mustang dyno which they claim reads lower idk. Anyway I wanted to stay na but as far as power goes there’s never enough lol.

 

[shurur]

413 on a dyno jet I wonder where it would land on a mustang dyno? I want to run mine in a dyno jet one day to see. I got to 310rwhp on my na build and that was with every bolt on possible without getting into any heads or engine internals. That number was also on a mustang dyno which they claim reads lower idk. Anyway I wanted to stay na but as far as power goes there’s never enough lol.

Na svt uses the dynojet for a reason. He considers it the most accurate.

Iirc the mustang dyno is overly generous most of the time.

If you have all the mods for the na svt recipe ( including LT), then 310-320 rwhp is about right with a tune.

Cams will get you 40-50 rwhp. Na svt (Todd Warren) can get you the cams you need for the oem piston cuts.

And/Or you can wait on cams and do a total rebuild like the one in the article.

 

[FIREBALL]

How much will the cams make without a tune?