My ongoing 8.1 adventures...
10-17-2013, 06:20 AM
#44
sb0mbsilverado - YouTube
Is my you tube channel
I like the new website I was checking it out the other day. I was curious your ported stock intake. how much of an hp increase over stock. I know the stock ones choke them on a souped up engine.
Also how much for a bare set of aluminum heads from you guys? You can PM me a price. I bought a used set from someone and they are fubar'ed and i would rather have a set that wasnt welded on holes screwed up etc
Is my you tube channel
I like the new website I was checking it out the other day. I was curious your ported stock intake. how much of an hp increase over stock. I know the stock ones choke them on a souped up engine.
Also how much for a bare set of aluminum heads from you guys? You can PM me a price. I bought a used set from someone and they are fubar'ed and i would rather have a set that wasnt welded on holes screwed up etc
10-17-2013, 05:44 PM
#45
On The Tree
Join Date: Oct 2013
Location: San Diego
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Hi xx_ED_xx,
You need to dyno that thing! Your truck is running our stage 3 kit and a single turbo right? (206 cam / heads / roller rockers / forged bottom end)
Thank you for the compliment on the new site! We've put in a lot of time to try and explain things better than we have in the past. We want to be as informative as possible and are using questions from the forums to further answer questions and concerns that come up from customers.
As you already know, the stock manifold really chokes the motor back above 4,250 RPM. Above is a rear wheel power comparison between three of our parts combinations:
Bone Stock (grey / black)
Heads / 202 Cam / Stock Manifold (dark blue dotted / light blue dotted)
Heads / 202 Cam / Cool Gap Manifold (dark blue solid / light blue solid)
Heads / 203 Cam / Stock Manifold (maroon / red)
As you can see, the Cool Gap / 202 cam combo makes more torque and nearly the same horsepower as the 203 cam / stock manifold past 4700! While maximum power increases over the 202 cam with the 203 camshaft, it really illustrates how much airflow becomes a limiting factor with these engines.
We haven't had a chance to put a ported intake manifold on the flow bench, but the porting essentially removes all restriction making the manifolds only real restriction the 78mm throttle body.
We're estimating that the ported manifolds produce about 80% of the air flow that the Cool Gap manifold produces. Preliminary dyno results from customers who have run the ported stock Vortec manifolds show great improvements over the stock manifold with slightly higher peak power points (200-400rpm increase) and extended power bands, but not quite as much as the Cool Gap manifold extends the power band. When we have more customer dyno results we will add that information to our charts, but the ported manifold has only been available for about 2 months.
We'll be putting the ported intake manifold on our newest shop project - a 2500 Suburban with hand ported iron heads, 203 cam and a 547cid stroker kit that fits in the stock block. (We'll toss some Raylar heads and the 206 camshaft into it eventually.) We expect that the stroker kit will show the limitations of the ported stock manifold. Since I'm mentioning the soon to be available 4.75 stroker crank setup, here are some pictures of the minor block notching thats required to make it fit.
Have I interested you in tearing your motor apart yet?
You need to dyno that thing! Your truck is running our stage 3 kit and a single turbo right? (206 cam / heads / roller rockers / forged bottom end)
Thank you for the compliment on the new site! We've put in a lot of time to try and explain things better than we have in the past. We want to be as informative as possible and are using questions from the forums to further answer questions and concerns that come up from customers.
As you already know, the stock manifold really chokes the motor back above 4,250 RPM. Above is a rear wheel power comparison between three of our parts combinations:
Bone Stock (grey / black)
Heads / 202 Cam / Stock Manifold (dark blue dotted / light blue dotted)
Heads / 202 Cam / Cool Gap Manifold (dark blue solid / light blue solid)
Heads / 203 Cam / Stock Manifold (maroon / red)
As you can see, the Cool Gap / 202 cam combo makes more torque and nearly the same horsepower as the 203 cam / stock manifold past 4700! While maximum power increases over the 202 cam with the 203 camshaft, it really illustrates how much airflow becomes a limiting factor with these engines.
We haven't had a chance to put a ported intake manifold on the flow bench, but the porting essentially removes all restriction making the manifolds only real restriction the 78mm throttle body.
We're estimating that the ported manifolds produce about 80% of the air flow that the Cool Gap manifold produces. Preliminary dyno results from customers who have run the ported stock Vortec manifolds show great improvements over the stock manifold with slightly higher peak power points (200-400rpm increase) and extended power bands, but not quite as much as the Cool Gap manifold extends the power band. When we have more customer dyno results we will add that information to our charts, but the ported manifold has only been available for about 2 months.
We'll be putting the ported intake manifold on our newest shop project - a 2500 Suburban with hand ported iron heads, 203 cam and a 547cid stroker kit that fits in the stock block. (We'll toss some Raylar heads and the 206 camshaft into it eventually.) We expect that the stroker kit will show the limitations of the ported stock manifold. Since I'm mentioning the soon to be available 4.75 stroker crank setup, here are some pictures of the minor block notching thats required to make it fit.
Have I interested you in tearing your motor apart yet?
Last edited by Raylar Engineering; 10-17-2013 at 06:10 PM.
11-05-2013, 05:13 AM
#49
01 02 express van 3500 with an 8.1. they use a single belt system. just like the vortec 454 trucks. you will need the alt bracket, ac comp ps bracket, water pump and balancer for this setup. Please post pics of your swap. Swap I have wanted to see done.