stock heads

[not a hemi]

has anyone ever tried to have our stock heads ported and polished or any thing like this? would there be any gains? i know a guy that does them for race cars and such , just woundering if it would be worth having done , also would be putting in the comp coupe cam?
thanks nathan

 

[JTS VENOM PERFORMANCE]

Porting the heads has a great affect on the breathing of our trucks. The gen III head is basically a gen II head that has been opened by the factory.

The coupe cam is awesome as long as you stay NA, if you decide to go FI then you need to have a cam specifically ground for your application, you can actually hurt the performance of FI with a coupe cam.

 

[AWDisuzu]

i love port work. it's easy and relaxing. and the gains are great. it's free power (minus the work involved)

I've never ported a viper head but on my race cars that I've done its yielded a lot of power. my last one went from 322 hp to 411 hp on the dyno. That was just port work on a 1.8 liter 4 cylinder.

 

[mmmmtorque]

I have a set of ported heads from Indy. Was able to pick up 20rwhp and believe I can get a few more ponies with a ported throttle body

 

[Silverback]

The thing is that just having at a head with with a die grinder is not the way to go.

First you need a head that you can experiment on and a flow bench to see what the results are. After you have developed a good pattern for the ports (both intake and exhaust) you make up some templates so you can grind each port the same. This takes a lot of time and effort.

Just opening up the ports can actually cost you HP. For a novice the best thing you can do is match the ports between the intake manifold and the heads.

 

[JTS VENOM PERFORMANCE]

And to add to silverbacks post, A set of viper heads that are ported by a person that has done them before can run you anywhere from $3000 to $5000 , or you can have it done cheaper by some other person, that has never dealt with viper heads and get a decent job.

but think on this also, you can get the stryker heads "with" a Jessel rocker set up for around $6500, and flow much more than ported heads, plus you can sell the stock heads and come out with a much better deal.

 

[1Fast400]

The heads mmmmtorque has have the same stock valves in them. The problem with the factory heads is water. You can't really open them up to much as you'll get into water. For low boost or NA applications, ported factory heads are fine. Only if you are getting into a REAL high boost application should you go with Strikers or the like.

 

[1Fast400]

Indy Cylinder Head (www.indyheads.com) would probably port your heads for about 1500 bucks. They already have the program in their machine. They only do CNC work, not by hand.

 

[silversrt]

I am wondering if i were to put the Stryker heads on my motor which has a Paxton , but a stock bottom end, would I gain another 150-200 rwhp.I know some have said they add as much as a Paxton alone.

 

[JTS VENOM PERFORMANCE]

Bud I really dont know about that, but they do make great claims, I am sure you would gain tremendous amount , but no one on here has done it yet so dunno?

 

[AWDisuzu]

the stock heads would need to be really bad for you to gain 200 hp. but it's definitely possible. the way I knew I needed to PP my race head was at 14 psi I made 280 hp. 28 psi Only made 322. so I hit the limit there.

you can increase flow by increasing the boost pressure, but when that doesn't help anymore you gotta find flow in other areas. cams, bigger valves, and PP jobs help a lot with boosted applications. not so sure a n/a engine will benefit as much since they aren't pushing the heads beyond their capacity yet.



Mike

 

[1Fast400]

There is no way you'd gain that amount. You'd need to be making a ton of boost to get those type of gains. A turbo'd motor "might" see that type of difference.

 

[Nowwhat]

I am wondering if i were to put the Stryker heads on my motor which has a Paxton , but a stock bottom end, would I gain another 150-200 rwhp.I know some have said they add as much as a Paxton alone.

Strykers + ported intake + cam + headers + tune = 150ish rwhp...it is the combination that is powerful....not the individual pieces....

 

[ViperTruck2933]

I'm having mine ported and polished in a couple of months along with a big cam, T&D roller rockers and hardened pushrods. I already have headers and exhuast. My builder thinks he can get another 80-100 hp out of the heads, cam, roller rockers and tune.:dontknow:

We'll see.

 

[JTS VENOM PERFORMANCE]

Nowwhat and viper correct the combination is here you get the most results

 

[HaulinAsp]

Strykers + ported intake + cam + headers + tune = 150ish rwhp...it is the combination that is powerful....not the individual pieces....

Agreed. Ported heads alone won't net that high a figure....

 

[Silverback]

You have to remember that power comes from getting more of the air/fuel mixture into the engine. I personally have not seen a set of heads off our engine, so I cannot really comment on what type of gains can be had with porting and polishing.

If I remember right the heads that Mike had done by Indy did not result in that great of a gain. He can correct me if I'm wrong, unless I'm on his Ignore List.

 

[1Fast400]

As mmmmmtorque stated, they gained him about 20, with an additional 15 I think coming from a cam. They were VERY mild, using the same valves as stock. They just cleaned up the runners. That was using stock valvetrain. Indy said going more on the heads, would have required new valvetrain and mmmm wasn't wanting to do that.

 

[Texas Yellow Fever]

When doing all this, I think another interesting mod would be to have our intake manifold extrude honed to open it up and smooth it out a little bit as well as gasket match it to the heads. If you look in the manifold it's rough cast to beat hell, smoothing it out sure couldn't hurt anything, even if you didn't open it up that much.

 

[mmmmtorque]

As mmmmmtorque stated, they gained him about 20, with an additional 15 I think coming from a cam. They were VERY mild, using the same valves as stock. They just cleaned up the runners. That was using stock valvetrain. Indy said going more on the heads, would have required new valvetrain and mmmm wasn't wanting to do that.

Did replace the lifters but didnt want to upgrade the valve train at the time. Yes, 20rwhp from the heads and another 20-25rwhp from the cam.