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Jim, Yes Darin offers porting and we discussed porting a FAST LS3 LSXR intake for my new 416 set up. Given that my goal is to shift at about 7,000 rpm and his recommended cam for my Daily Driver is a custom 238/244 Darin told me having him custom port the FAST LS3 LSXR intake for my set up would not be a cost wise $$$ to hp benefit for my set up and goals.
If my build was less daily driver friendly and more race oriented with more rpm and matched higher rpm cam then I would have stepped up and spent the extra $$$ for a Darin Morgan ported LSXR.
However, I have seen, dyno tested, flow bench tested & owned enough FAST intake manifolds to know there is some basic clean up that can help. I discussed port LSXR's with several vendors and did some research. I felt for cost hp benefit the WS6 / VENGEANCE Racing LSXR would be ideal for my goals.
After seeing how well the intake worked in the flow test I'm happy.
I also wish I had one of Darin's special intakes to test too!!!!
I have an RC LS3 intake (recommended by Patrick Guerra when I bought it), and those are radius bars. My understanding is that GPI started making them also after approval from Rick...who really knows. I'd love to see it flowed with good heads, but it's on my daily driver though and I don't have a spare. If you're going to do more testing, I'd be curious to know if a 92mm TB presents a restriction with the non-stock heads/intake.
Is the gain from the porting or those bars? maybe both. no real way to compare without all 3 really.
Look for Rick's (G8-4-Speed, same handle here) comments in the first thread. He makes it sound as if he couldn't make progress until he fabricated something to help the air turn the corners. He also says the FAST won't benefit from it since it already has bellmouth runners.
I got a friend who did a home made rod-mod ls3 intake. He said he felt it in the seat of his pants. He didn't do a direct before and after dyno with just that mod.
When he wrecked his car, he salvaged the intake, so it was good enough he wanted to transfer it to a new car eventually
Darth, with homemade radius rods what diameter did he use? Epoxy to hold in place?
I read somewhere that GPI said the porting was like 1-3hp and the rods were like the majority of the gain. ~5hp bolt on car & 12-15 on cam or heads & cam set up. The price seems expensive for putting a pair of rods in the intake.
Seems like it's worth testing if anyone has one available to test.
Maybe Fast won't benefit due bell mouth runners but I still wonder if other if other factory intakes would.
Last edited by 99 Black Bird T/A; Aug 2, 2017 at 05:10 AM.
Darth, with homemade radius rods what diameter did he use? Epoxy to hold in place?
I read somewhere that GPI said the porting was like 1-3hp and the rods were like the majority of the gain. ~5hp bolt on car & 12-15 on cam or heads & cam set up. The price seems expensive for putting a pair of rods in the intake.
Seems like it's worth testing if anyone has one available to test.
Maybe Fast won't benefit due bell mouth runners but I still wonder if other if other factory intakes would.
Darth, with homemade radius rods what diameter did he use? Epoxy to hold in place?
I read somewhere that GPI said the porting was like 1-3hp and the rods were like the majority of the gain. ~5hp bolt on car & 12-15 on cam or heads & cam set up. The price seems expensive for putting a pair of rods in the intake.
Seems like it's worth testing if anyone has one available to test.
Maybe Fast won't benefit due bell mouth runners but I still wonder if other if other factory intakes would.
I wish I could answer your questions, but I only saw the pictures of it and we talked about it, and I understood the why, but didn't get much into the how. I'd PM HioSSIlver or LazerLemonTA top ask them about it. It was on Lazer's Camaro that did 475 HP and 11.56 in the quarter still on stock heads and cam, so it was part of a combination that did quite well.
Kook's headers and Y pipe arrived today! Only Parts left to get are new alternator, starter and idler. Talked communication with Norris Motorsports - looks like mid-Sept for install!
The Kook's look good about ten times better than the rusty second rate Jet-Hot coated long tube Hookers that are on the TA now.
The Kook's headers are 1 7/8 primary 3 inch collector. The primaries were Ground clear of welding Slagle and look excellent. The flange is flat and appears to have been decked to me for a good seal. The O2 sensor bung, the threads look freshly chased. Careful inspection of the collector welds and they look excellent, no gaps and no daylight. The collector has a nice velocity spike in it. A+ product.
The old Jet-Hot LT Hookers on my TA had issues with everything listed above and we're the very worst / lowest build quality headers I've seen. They had to have several spot welds so one couldn't see daylight in the collector, O2 bung threads cut, wrapped flanged decked and a ton of welding slag ground out of the primary's. The Kook's are so much better in every regard.
The Good
Motor is out of the TA two days ago. Short block was built up day before yesterday. Yesterday new motor went into to the car
The Bad
Oil pump was missing
Only one coil pack harnesses
No bolts for the lifter trays
Wrong oil pressure sending unit
No LS1 harness to LS3 style adapter for the 100mm LPE MAF
TA's old Mufflex Y-pipe was trashed, or the new Kook's Y pipe had to be used.
I picked up a new starter & alternator - I apparently goofed up and got wrong ones.
The Ugly
The new motor won't start.
The PCM isn't getting crank or cam signal. The LPE 58x to 24x box powers up.
Car sets crank sensor code immediately.
When I learned this my check underwear light came on.
SES code of sorts for the shorts!
The Holley tall valve covers didn't fit very well for my TA. They put a coil pack directly against the heater box. They will have to be replaced with stock valve covers and stock length plug wires.
On the bright side I'm sure Norris Motorsports will sort out the issues.
I'm thankful Norris Motorsports is close by to get my TA sorted out.
Entirely our fault on that one. No excuses there.
I emailed you to see what issues you had that were our so we could take care of the issue one way or another for you.
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