Intake Manifold Flow Tests: LS1, LS6, TBSS, BBK, Dorman LS2, 102 Fast LSXRT & more
05-08-2018, 04:23 PM
#421
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My pleasure.
05-09-2018, 03:02 PM
#426
No prob...Im using your data the same way I am using head flow from companies to purchase heads (which I also have tons of data for lol). I will run the MSD with a cam eventually, but for bolt on work its gonna be the 90mm LS6 or TBSS I think. I probably need to add another row for Avg. flow from .3 and up too.
05-10-2018, 10:56 AM
#427
Good luck on that. I've been severely disappointed with them in every transaction I've had. I've been hoping to see something on the ported dorman truck intake also. I know I had a SOTP gain when I switched to mine over the gen3 truck intake but it wasn't dyno'd to confirm.
05-13-2018, 11:03 AM
#430
TECH Senior Member
05-13-2018, 01:41 PM
#431
That would be a nice addition to the chart. I've test a early Dorman LS2, late Dorman LS2 and a WS6 Store ported Dorman LS2 but not an actual LS2 intake manifold.
05-13-2018, 03:11 PM
#433
TECH Senior Member
If it's an easy enough answer, what's the difference between the early and later Dorman LS2's?
05-14-2018, 12:59 AM
#434
they used fast tooling to make the bottom and mid shells. the top is their own design, and imho it sucks.
i would rather have an "obsolete" fast 90 than a dorman ls2 or an OEM ported LS2.
now, like i said, it is interesting they flow similar. i'd rather have a ported LS2 if i had to chose between the two because it can be had for cheaper. or better yet, just have an actual FAST--which i do on both of my vehicles.
Last edited by dreadpirateroberts; 05-14-2018 at 01:08 AM.
05-14-2018, 01:03 AM
#435
from what i have read, the OEM LS2 manifold was actually supposed to be a superior manifold to the LS6 and was hampered, unfortunately, from the lousy 3-peice construction and poor joint sealing/matching between these molds. i can attest to that from porting a few, although i've never dynoed or flow tested. plenty of posts and threads about it from years ago, though.
had GM stuck with a lost-core casting process that they used for the ls1/ls6 manifolds, LS2 OEM manifolds might just be the coveted OEM cathedral port manifold. but, it ain't.
all the same, the design is there, even though the construction quality ruins it--plenum volume, runner length, shape, and cross section. ported, it should preform relatively well. ported ls2 manifolds to tend to gain a bit over non-ported in practice.
05-14-2018, 01:07 AM
#436
plenum and runner design is different between the two manifolds. i would expect variances like that. i think it's more interesting the flow is as close as it is.
05-19-2018, 06:03 AM
#438
On way to Land Speed Cylinder Heads to do testing this morning. My recently repaired 99 TA's Norris Motorsports 416 is getting some more break in miles today in the "truck role" of carrying parts 
Intakes
Tony M ported MSD
LPE 90mm snout LS6
Super Vic
Super truck
Cylinder Heads
LPE / GMPP used previous and Wagner NASCAR LS2 799 with titanium valves. The wagers have a wing in the intake ports that I think is specifically designed for carb applications. They seem a natural to test with the Super Vic.
Intakes
Tony M ported MSD
LPE 90mm snout LS6
Super Vic
Super truck
Cylinder Heads
LPE / GMPP used previous and Wagner NASCAR LS2 799 with titanium valves. The wagers have a wing in the intake ports that I think is specifically designed for carb applications. They seem a natural to test with the Super Vic.
Last edited by 99 Black Bird T/A; 05-19-2018 at 06:17 AM.