Marine Intake

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Singlecab

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Man I sat and read through from the start. First off I can only imagine the power numbers your talking. I will probably dig out that 4bolt and start building it once a few things settle down. But I can only continue with my build. Seems really hard to get it set up relative to tuning. I have a few local prospects to tune mine, but black bear allows free changes up to a year and 40 bucks per retune after. I have emailed the tech support to ask what familiarity they have with the marine intake, but after reading this thread I’m starting to think I’m going to have to get set up to do it myself. I only set out with hopes of 350-380 torque, and whatever hp came with, along with a healthy engine. I didn’t think lean issues and the lot would be things I would have to navigate to this degree. I’m so torn up on headers. Gibson shortys would be the easiest. The only long tubes I can find that seem of quality would be the hooker stainless. There’s just not much available.

On a different note. Previously I chimed in for help with injector fitment in the intake ports. The first intake I found they were just loose in the intake ports. The second intake I found broke during shipment, and third pictured above…the injectors fit snuggly in the ports. The first intaje has substantially larger injector ports. What are your thoughts on that?
 

Supercharged111

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A healthy 350 should be knocking down closer to 400# of torque so your goal of 350-380 is going to be too easy. Hell, a stock motor with exhaust and a tune will hit that mark.

In a sick way I'm kind of glad to hear you concede the lack of low end torque Chris, I'd felt that was too much cam to not kill off any low end even for a 383. If you weren't driving a house on wheels it may have been a good combo. This I type as I round up supporting parts to stick a 227/234 111/109 in my Z06. . .
 

L31MaxExpress

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A healthy 350 should be knocking down closer to 400# of torque so your goal of 350-380 is going to be too easy. Hell, a stock motor with exhaust and a tune will hit that mark.

In a sick way I'm kind of glad to hear you concede the lack of low end torque Chris, I'd felt that was too much cam to not kill off any low end even for a 383. If you weren't driving a house on wheels it may have been a good combo. This I type as I round up supporting parts to stick a 227/234 111/109 in my Z06. . .
I think that says alot about how well the V-Max lifters work minus the noise though. Same cam behaves 15-20* smaller at 0.050. In my application ~10-15 hp is not worth the added complexity with the valvetrain adjustment or the added lifter noise. At the end of the day with the L31 van intake hat my engine is happiest at 5,500 or less as it becomes a big airflow restriction at higher rpm and the MAP reading plummets.
 

Singlecab

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I don’t know why I never had it tuned before. I feel like with what I’ve read in this thread I will end up driving someone nuts with back seat tuning based off “what I read online”.
 

Supercharged111

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I think that says alot about how well the V-Max lifters work minus the noise though. Same cam behaves 15-20* smaller at 0.050. In my application ~10-15 hp is not worth the added complexity with the valvetrain adjustment or the added lifter noise. At the end of the day with the L31 van intake hat my engine is happiest at 5,500 or less as it becomes a big airflow restriction at higher rpm and the MAP reading plummets.

I was thinking the same thing about the lifters, it really does speak volumes to their function. And to think this whole thing began with a little too much cylinder pressure down low.
 

L31MaxExpress

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I was thinking the same thing about the lifters, it really does speak volumes to their function. And to think this whole thing began with a little too much cylinder pressure down low.
Well the lifter change did. The whole project started as an intake swap that progressed to a coolant leak to finding broken head bolts.
 

HotWheelsBurban

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Yup I've had truck repairs like that! Our previous 99 Burb, I was doing an oil and filter change, saw the dreaded orange dripping from the water pump, replacing water pump, let's see what the timing stuff looks like, chain had some slop, factory nylon gear with 175K on it, let's replace all that, gotta replace the plastic TC cover, gotta drop the oil pan so replace those gaskets, then let's do the hoses too, then tensioner and belt.....of course to drop the pan, had to jack the engine up some, so had to pull the motor mount bolt.....
Took almost a month because I was working on it on the driveway, and between the weather and my days off....
 

L31MaxExpress

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I have officially started gathering parts to build a new engine harness for the van this evening to convert it to 58X. Bought a brand new in the GM box engine harness for a 2016 Express 6.0L Flex Fuel/6L90E for $350 on Ebay that has already been discontinued from GM. I will integrate the 2016 engine wiring into a spare 2001 Van harness I have off a donor van re-using the stock 96-02 van C100 connector and fuse box. I will have the harness ready to go for when I swap the cam and put an EFI connection 58x reluctor on it when the cam is being swapped. I will probably do the 6L90E swap at the same time. Then again I may leave the 85E until it croaks and merely shift the 85E to a T42 to control it.
 
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