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Does anyone have any data for a stock cubed LS3 with a mid sized cam like mine showing the under the curve gains or losses with the Fast? I'm more concerned about that than a peak # since that is where my car will be the majority of the time since it's a street car
Like what? Like the same Rick Crawford treatment? Cause the nice thing about the fast, you can disassemble and really get in there with a grinder. So I'd assume the porter already removed all the material you're going to remove to get the most out of the ports - or else why have it ported, right?
Do you assume that about AFR heads? Or trick flow? The difference is about the same as it would be with as cast vs cnc vs hand work/recnc. And its not about removing as much material as possible either. Its about deliberate design. You know that im sure.
No radius rods or extra parts added like that. Its not advertised, but there are other options just like quite a few other parts.
Right. As you can see just the entrance was ported and blended and about 2 to 3 inches into the runner. MUCH more could be done. Its entirely possible the rodded ported ls3 is on par with a nearly out of the box fast102 ls3 or at least it would be a close game anyway.
Do you assume that about AFR heads? Or trick flow? The difference is about the same as it would be with as cast vs cnc vs hand work/recnc. And its not about removing as much material as possible either. Its about deliberate design. You know that im sure.
No radius rods or extra parts added like that. Its not advertised, but there are other options just like quite a few other parts.
At first i took your post to mean "we just did a cursory touching up and didn't port it very much", which honestly, if I paid several hundred extra for would tick me off. I have seen "port jobs" that were little more than scratching with 400 grit sand paper to look ported. I'm sure you have too.
To answer your question - i assume that the porter removed material where needed to maximize the flow and velocity of the air through the runner. not that they hogged it out as far as possible, but at least maximized the part's capabilities.
if I was shopping, between the 2 i'd get the rod modded ls3 intake. The primary reason IMO for the fast is the availability of mid length runners - but in that sense, I'd either be building for RPM or larger displacement
For reference this the Rick Crawford Radius Rod Intake. There are three ~ 50mm holes cut in the floor of the intake. The bottom is intact. In the second picture the round gray spot is one of the epoxy fillers. I will shoot a picture of the exterior bottom for better detail.
While not the same as an intake manifold my 99TA's Lingenfelter ported throttle body is epoxies. It's been on the TA for ~ 18 years and ~160,000 miles with no issues. The Crawford might need to be checked every so often (like many speed parts) but they appear to hold up well.
Not at all. We did not port it. Vengeance did. Thats why it says ws6/vr in tests. We CAN and may move porting in house on them but porting 5 to 15 pumps at a time plus the labor intensive Dls2 intakes keep me busy lately.
We want a quality product if "outsourcing" and Vengeance is def that.
There is quite a bit of room for more flow, but then the price on an already pricey setup goes up with more hours into it. Is it worth it? If you can justify cost vs gains then yes. The manifold isnt taken apart there so no issues with cracks, leaks, etc either.
For reference the Rick Crawford Radius Rod modified LS3 Intake manifold exterior pictures.
Also note I'm happy with the WS6 VR ported Fast LSXR. It's a nice piece.
I will probably send Rick Crawford my stock LS3 intake for modding later.
It's really a case of win win both are very good.
The Rods are secured in front on both the left and right sides. The nut is visible.
They rods are secured in back with epoxy.
The bottom of the intake with the three accesses drilled out and epoxy filled. They are probably less than 50 mm.
The bottom of the runner looks like this. It could probably be ported by Peak Performance or someone else. Not sure what that would gain if any.
Impressive! A mod simple in principle(but NOT in time and skill!) can make such nice gains and retain stock appearance (at least to the unknowing eye...)
Any idea what he charges to do these mods to a stock LS3 manifold?
Impressive! A mod simple in principle(but NOT in time and skill!) can make such nice gains and retain stock appearance (at least to the unknowing eye...)
Any idea what he charges to do these mods to a stock LS3 manifold?
I'm not sure what the exact price is these days. I think contacting Rick Crawford Racing via his LS1Tech screen name or email would work.
(G8-4-speed on this site) or e-mail him [LS dash 4 dash speed at nc dot rr dot com]
Last edited by 99 Black Bird T/A; 09-19-2017 at 07:37 PM.
I prefer the FAST for NA setups because I don't like having epoxy and metal pieces inside my intake manifold. As years go by heat cycles cause things to come loose. We've seen a few of the modified stock intakes that don't look that great after a few years. We've seen good results with the FAST both in mid range torque and top end power. Over 6500RPM the larger plenum and runners of the FAST seem to really shine, at 7000 on even a basic head/cam can be +40 over a stock manifold.
The downside to the FAST is on boosted cars, for them I prefer a cast or stock intake as we've seen the FAST flex a lot. Even on a NA 416 the FAST flexes a little but we haven't seen any damage at that power level.
The materials inside the intake would also be my concern over time. Does anyone have any info on the material used in the Gwatney version or how the rods are installed in it?
The materials inside the intake would also be my concern over time. Does anyone have any info on the material used in the Gwatney version or how the rods are installed in it?
Gwatney's website says epoxy just like Rick Crawford. They also list a few other details.
Hiossilver did my rod mod LS3 intake and a really aggressive TB port that took me some time tuning to make it work. My bolt on set up plus 1.85 rockers and E85 made a solid 473HP and 475TRQ in my 2015 1LE. Unless your intent is to put a cam that can utilize the fast in the 7k+ range the LS3 is hard to beat.
09-19-2017, 11:30 AM
