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Old 05-19-2021, 12:22 AM   #1
Abelardoo_12
 
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Benefit of ported heads

I have a l99 and will be putting a 416 stroker kit in it with a whipple supercharger. I was planning on getting the heads ported but after reading a couple of threads Iím not sure if it will be worth it. Our heads are pretty good stock and there arenít much gains on a n/a set up, but what about on a 416 stroker? Plus with a supercharger? Would there be any benefit for ported heads on this set up?
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Old 05-19-2021, 06:27 AM   #2
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Even with a supercharger, your engine is still just a big air pump. The easier you move air in and out, the more power you make. Porting the heads will reduce the amount of boost required for the same horsepower. It's up to you to decide if it's worth the extra expense. I have no regrets with my setup.



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Old 05-19-2021, 06:27 AM   #3
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Can possibly work against you; I have CNC GMPP heads fitted (done at same time as Magi install) and the efficiency of the heads along with the long tubes means that I'm only pushing "about" 6lbs of boost (according to Magnuson tech guys) where normally they'd expect about 7lbs. They theorize that the spent stuff is getting scavenged from the combustion chamber more efficiently than usual. Dunno how true this is without getting the car in a laboratory or the motor on a flow bench/dyno. All I know is, it's plenty :-)
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Old 05-19-2021, 06:46 AM   #4
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Quote:
Originally Posted by Abelardoo_12 View Post
I have a l99 and will be putting a 416 stroker kit in it with a whipple supercharger. I was planning on getting the heads ported but after reading a couple of threads Iím not sure if it will be worth it. Our heads are pretty good stock and there arenít much gains on a n/a set up, but what about on a 416 stroker? Plus with a supercharger? Would there be any benefit for ported heads on this set up?
If your are going that far, why wouldnt you do it is a better question. Squeeze all the horsepower you can. You will get used to the power and start regretting the decision to not do the heads. Stock heads do flow fairly well, but there is gains to be had. I'm running relatively low boost and my setup feels insane. Better yet, grab a set of aftermarket heads for even more gain. I can fully vouch for the heads from GPI. They are a work of art
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Old 05-19-2021, 10:13 AM   #5
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My plan initially was to get them ported since they were going to be off. Then as I kept doing research I came across different posts saying it wouldn’t do much on a supercharged engine. That’s where I started having doubts about doing them. But looks like I should get them ported after all.
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Old 05-19-2021, 12:21 PM   #6
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You'll pick up power AND have less boost and heat. Lost boost is not lost power in this case. Common misconception. You are reducing restriction by improving flow.

Ported heads might pick up 30 at the wheels, aftermarket heads- 50 or more. All depends on mods and power level you start with. With a 416, you'll see a big benefit. It wants to breathe better than the stock heads flow, for sure.
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Old 05-19-2021, 03:46 PM   #7
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Going larger displacement and or boost, porting will be beneficial. So in your case with the 416 YES port them. Stock displacement N/A, can cause you to lose some power depending on how much lift you run. Porting causes a loss of flow at low lift, say under .200" but you gain more flow at over .600" lift. If your staying at or under .600" lift for a cammed car, porting will likely hurt performance. Because at .600" lift or less, you want that increased low lift flow. If your pushing considerably more over .600" lift than the loss in low loft flow is gained back and then some, in the higher lift flow numbers, over the .600" mark.
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Old 05-19-2021, 07:24 PM   #8
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Thanks for the info, looks like I’ll go ahead and get them ported
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Old 05-20-2021, 08:29 AM   #9
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Most of the threads are about I want to supercharge my car down the road, what heads should I get. That answer is, save your money stock heads flow really well just do the supercharger you'll get more bang for your buck, save the money for the FI. Nothing wrong with doing both. My question would be how far do you plan to go because the Whipple 2.9 maxes out around 900whp. To get there you need fuel. Doing the heads won't do you any good if you are limited by fuel supply.
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Old 05-20-2021, 09:33 AM   #10
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Originally Posted by Greenhornet2 View Post
Most of the threads are about I want to supercharge my car down the road, what heads should I get. That answer is, save your money stock heads flow really well just do the supercharger you'll get more bang for your buck, save the money for the FI. Nothing wrong with doing both. My question would be how far do you plan to go because the Whipple 2.9 maxes out around 900whp. To get there you need fuel. Doing the heads won't do you any good if you are limited by fuel supply.
I donít plan on going that far with power on just the blower but I am trying to get as much as I can without too much boost. And yes dual pumps and injectors are also part of the build
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Old 05-20-2021, 10:42 AM   #11
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So to me it really depends on where you end up. Talking to a tuner or builder may be better. You will have to spin that blower pretty fast to pressurize that 416, I assume cammed ect.. so once you are turning that blower at its limit where does the boost end up. if its say 16psi with unworked heads, maybe with the worked heads you will be at 15psi and you'll be putting out essentially the same amount of power tho a little safer with less boost pressure. If you want every ounce out of it, I can see it. Me, I don't think I would. If I wanted to go into the 1kwhp party with a stroker I wouldn't be using a Whipple and would likely go turbo and new aftermarket heads.
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Old 05-21-2021, 05:57 PM   #12
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As the piston drops and air is drawn into the cylinder, the gasses begin to accelerate down the port towards the cylinder.. when the piston is at the bottom, air will continue to cram itself into cylinder due to inertia, then the valve closes trapping the air in..

There is math involved. Too small of a port will choke the cylinder, too large a port will mean a low velocity of air and will limit the 'cramming' effect.

I didnt provide any answers but I hope this helps you out.
Personally I'd ask a good engine builder and go with his recommendation.
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Old 05-21-2021, 06:00 PM   #13
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Also, dont worry about restriction until its effecting your power gains.. if your flowing 2 grams per cylinder at 15psi or 2 grams per cylinder at 10psi.. you still have the same ammount of air to throw fuel at (2 grams)..
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Old 05-25-2021, 08:50 PM   #14
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Originally Posted by Abelardoo_12 View Post
Thanks for the info, looks like Iíll go ahead and get them ported
Good choice. Get it done.
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