What truck intake manifolds are available for L92 heads?

I swaped to L92 heads and intake but it seems the L92 intake is becoming a restriction.

I regret that I can't run the FAST LSXRT 102mm Intake Manifold with L92 heads.




What are my other options.

Truck made 451rwhp/450rwtq on dynojet. I think the intake is the limitation. Mods are in signature.

 

Big reason why Im staying cathedral port. Other is the cost of the conversion.

Get it ported. I wouldn't go vic jr, or a car intake.

Honestly, I would look at your exhaust before the intake.

Id say pacesetters and 3" exhaust on a 427 is your biggest bottleneck right now. I heard 40 series flows are ok. But if you are running another series muffler, thats hurting you too.

1-7/8 (maybe 2") LTs, 4" exhaust, round borla xr-1...imo

 

Not a whole lot of options....L92 truck intake, LS3 car intake, Vic jr....

 

Your limitation is the 4L60E

 

Muffler is 40 series but it's a little short, 17" case, 3"in/3"out. I am thinking to replace the muffler with a longer Borla or Magnaflow muffler. Also, I can try a 2.5" cutout on the dyno to see if there is any big improvement before jumping to change the muffler.

I have no plans to swap the headers. Also, I think 4" is an overkil for my truck. I don't rev it to more than 6400 rpm and rarely even go more than 6000 rpm.

My tuner says the MAP goes from 100 to 95 at WOT high rpms and he thinks it has a restriction at the intake/TB. We tried a dyno pull with air filter removed but still the same.

 

Looks at skeet's set up and time slips. He is using the Fast LSXR and made more HP and same tq on a stock LQ9 than you do with a 427. . .

 

As mentioned in post#2, I am thinking to get the intake ported by LS2PortWork, if that will add value.