Finally! Modified Stock 8.1L Intake Manifiold Numbers!
#11
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I'll do one better: here's a video of the truck as it sits today.
Raylar 540 Stroker with Modified Intake Manifold - YouTube
The modified stock manifold makes 25 more peak horsepower on stock heads and the same peak torque - but with great improvements over the stock powerband.
At this point, we're completely convinced that this is the upper limit of the stock cylinder heads (even with porting) without switching seats and putting larger valves in. The stock iron heads are coming off and a set of Raylar aluminum cylinder heads will be going on the Suburban.
**On a side note, there has been some talk with Whipple Superchargers about creating a completely new 2.9L blower package for 8.1Ls on the street.. Keep your fingers crossed on this one!!
Raylar 540 Stroker with Modified Intake Manifold - YouTube
The modified stock manifold makes 25 more peak horsepower on stock heads and the same peak torque - but with great improvements over the stock powerband.
At this point, we're completely convinced that this is the upper limit of the stock cylinder heads (even with porting) without switching seats and putting larger valves in. The stock iron heads are coming off and a set of Raylar aluminum cylinder heads will be going on the Suburban.
**On a side note, there has been some talk with Whipple Superchargers about creating a completely new 2.9L blower package for 8.1Ls on the street.. Keep your fingers crossed on this one!!
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Kearny Mesa.
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So exciting to hear whipple has something in the works for us....I have been meaning to call them forever. I want the 4l jack shaft set up they make for the 5th gen camaros....I think there is room
#16
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I thought the silver truck was running our heads / cam etc??
30lbs of boost! Do you have the forged rotating assembly (pistons / rods / crank)? I know you already know this, but boost + cast pistons can create more problems than its worth!
Let me talk to Larry, but I'd bet if you wanted to pay the shipping, the ported stock heads off the shop Suburban could probably be yours when we put the aluminum heads on the 540. You're probably only going to get another 20-30CFM out of them, and you'll still have to have new seats / valves put into them, but at least it saves you the 10 hours of rust and misery that is grinding down stock iron heads.
You'll still need springs, roller rockers and a boost friendly cam - but you already know who has all that.
30lbs of boost! Do you have the forged rotating assembly (pistons / rods / crank)? I know you already know this, but boost + cast pistons can create more problems than its worth!
Let me talk to Larry, but I'd bet if you wanted to pay the shipping, the ported stock heads off the shop Suburban could probably be yours when we put the aluminum heads on the 540. You're probably only going to get another 20-30CFM out of them, and you'll still have to have new seats / valves put into them, but at least it saves you the 10 hours of rust and misery that is grinding down stock iron heads.
You'll still need springs, roller rockers and a boost friendly cam - but you already know who has all that.
Last edited by Raylar Engineering; 08-27-2014 at 10:58 PM.
#18
i had a set of your heads but the previous owner damaged them and i didnt trust them. I'll do one better I will come to your shop and pick them up. And yeah i need to buy rockers
I will be in LA to pick up a car for a friend and i was debating swinging by your shop since it is only a few hours south.
I will be in LA to pick up a car for a friend and i was debating swinging by your shop since it is only a few hours south.
#19
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