CorvetteForum - Chevrolet Corvette Forum Discussion - C6 Tech/Performance

10% off EVERYTHING we make at AMT Motorsport starts NOW

Mark@AMT Motorsport — Fri, 22 May 2026 11:09:14 GMT

It's that time again folks! Starting RIGHT NOW and running thru Memorial Day, every AMT product on our site is available at 10% off when you use coupon code "CF26" at checkout. This is your chance to save some serious coin on big ticket items like our Spherical Bearing Kit, The Wing of Power, Finger of God, X-Wife Drop Spindles, and will also yield substantial savings on Camber Kits, Spacers, Motor Mounts, Diff Mounts, Seat Mounts - oh my!

Head to www.AMTMotorsport.com to take advantage of the discounted pricing.

We've listed some of our products below in case you may be unfamiliar with what we do.

C8 Aero - The Wing of Power, Finger of God, Zebulon Splitter, Quick Release Splitter Hardware

The only trunk/frame mounted, reverse swan neck, all US-made, CFD and Wind Tunnel-tested, carbon fiber track wing available for the C8 - or any car. Pair it with a Zebulon front splitter and our quick release system, and you have a streetable track car with a 1.94:1 L/D ratio. There is no more powerful aero package available for the C8 Corvette. By a factor of 2. Period.

There's a lot to unpack, so click here to learn about all of our C8 Aerodynamic offerings

C5-C8 Monoball Control Arm Bushings

If you're looking for slot-car like handling for your Corvette then a set of monoballs is probably the best money you can spend on your car. The car is transformed and so much easier to drive on the limit. We use the best materials available and custom fit each part to your YOUR control arms. All you have to do it send them to us and we take care of the rest, and return shipping is included.

Follow this link if you would like to turn your car into a race car.

C5-C8 Ultralow Seat Mount

This is the lowest, strongest, safest billet seat mount available for the Corvette. It will put your seat on the floor if needed. Using this mount with the Sparco QRT-R seat I gained almost 2 inches of head room over MTI rails with a Sparco EVO. Our integrated sub belt takes the guess work out of installing your 5 or 6 point harness. Not only that but it will survive an 85G mostly-rear impact. This seat mount saved my life and it can save yours too - just hope you never need to find out!

Follow this link to get yourself low.

C7/C8 Titan Tow Hooks

Made from 7075-aluminum and hardened 17-4PH stainless steel, this US-made aerospace-grade tow hook could actually tow a space shuttle. So it'll look bitchin' on your street car or pull you out of a tire wall easy peasy.

Prepare for launch here

C5-C8 Adjustable Camber Kit

The product the launched our company is available for all C5-C8 Corvettes. If your car sees any serious track time than a camber kit is virtually required equipment. Set your alignment once and never worry about it again. Everything is USA made and guaranteed for life.

For more info on C5 and C6 camber kits follow this link. For the C6Z/ZR1 head over here. To solve problems for all C7s head this way.My C8 peeps should take a look seeright here

Differential Mounts - C5 and C6

Mitigate wheel hop and stop your trans from flopping around during hard cornering with our offerings for the C5 and C6 Corvettes. Rather than knocking off the same product that everyone else has for the last 15 years, we came up with fresh and updated designs to address short comings from competitors. These billet pieces firm everything up without a huge increase in NVH and they are guaranteed for life.

For the C5 check this out and for the C6 check that out.

X-Wife Drop Spindles for C5 and C6

Combine GSpeed design with AMT Motorsport manufacturing and what do you get? The best God-damned drop spindle on the planet that's what! Machined on our 5 Axis CNC, they start out as 70 lbs blocks and wind up as the 6.5 lbs beauties you see before you. Available in plain finish or your choice of anodized colors.

Learn more about the X-Wife by clicking here.

C4-C7 Wheel Spacers

We offer 4 different sizes of wheel spacers. Our 1/4" spacer uses the lip of the stock hub for centering and can be used with stock length studs. Our 3/8" spacer pushes the wheel out a smidge further but the ring on the hub is no longer effective. We recommend going to the 2.5" ARP studs if you're using a 3/8" spacer. We also offer 3/4" and 1" spacers with a machined lip for centering. These spacers should use the 3.25" ARP studs.

For 1/4" and 3/8" spacer head this way. For 3/4" and 1" go that way.

C5/C6 Vulcan Motor Mounts

These mounts are now on their third variation and better than ever. A single bolt keeps your motor from moving fore and aft, while vulcanized rubber dampens the vibrations so they're not as harsh as solid mounts. We now use a hard anodized 6061 center section to keep the 2 rubber pucks in each assembly where they belong. Make no mistake these mounts do not feel like the pillowy soft oil-filled gushiness of the stock mounts. You are definitely going to feel more of the engine with these mounts, but your 350 lbs lump of a motor will not be moving all over your engine bay either when performance driving.

Follow this link to order yourself up a set of motor mounts

C5-C6 Extended Gas Pedal

Our product makes heal/toeing your C5 and C6 Corvette a breeze. It's a cheap and effective mod to increasing your driving enjoyment and I guarantee you'll love it or I'll give you your money back.

To make your Corvette easier to drive at the limit, click here.

C7 M80 Adjustable Toe Links

After selling a different product for a number of years, we've decided to start making our own version of adjustable toe links for all C7 Corvettes. The previous product had fitment issues with various parts and quality issues with the heim joints. Trying to work with the supplier to correct the issues wasn't getting anywhere, so in order to best serve our customer base, we came up with the AMT Motorsport M-80 Toe Links which use 7075 aluminum, 17-4 PH pins, and FK Heim Joints for the strongest and longest lasting toe links on the market.

Head here to snag a pair.

Thanks as always for the support!

Common failure points of Morimoto headlights?

SSkull — Thu, 21 May 2026 21:59:46 GMT

I picked up a C6 recently, already had some Morimoto C7 style headlights. Original plan was to switch them back to OEM units since I had never liked Morimotos when I saw them online. But seeing a set in person when I picked the car up completely changed my opinion. No idea why I hate how they look in photos.

Issue with them is that the driver side unit has some sort of intermittent problem with the turn signal function. I originally thought it was just the driver side marker bulb burnt out causing hyperflash of some sort, swapped in a set of laser sidemarkers front and back and was still doing it. That's when I realized it was actually the turn signal in the driver side Morimoto unit. Previous owner mentioned they would sometimes work and sometimes not for the turn signal. I was correcting the aim of the lights the other night and tried to see if maybe there was something maybe loose but no movement cause any differences.

Then this morning I start driving to work and the turn signals functioning just fine, no hyperflash either since it's functioning. Then by the time I got to work it had already stopped and the hyperflash was back as well for obvious reasons.

I'm planning to pull the driver side wheel to get better access to the port in there, is there anything specifically that is known to cause these connection issues on these headlights? I don't know anything about them really. My initial plan is to just disconnect everything in there, check all the pins for any obvious issues, and probably spray contact cleaner in all of them as well. But figured it can't hurt to ask here in case someone has some suggestions while I'm in there.

As far as lighting I'm just waiting on my InfiRai lights to show up and there shouldn't be any further changes to the lighting on the car at that point, so I just want to make sure I try and make this a one and done.

Appreciate any input, thanks.

P0336 After Car is Warm

sonics — Thu, 21 May 2026 17:05:14 GMT

Hello all, first time making a thread here. I'm 18 years old, and this the first issue ive encountered with the car, so im looking for some help. I relocated battery to rear cubby about 5 days ago. all was well until about 2 days later i had a 30 minute drive somewhere, turn the car off for about 3 minutes, go to start it again, it has a very hard time starting for about 5 seconds. it did start, however rpm gauge did not move at all and i had CEL that came up as P0336. swapped the sensor out for a brand new GM one, car was fine for the rest of the day. I drove it for about an hour, stopped to get gas, and the car turned back on just fine. The next day i had another 30 minute drive, car was off for about 10 minutes, go to start it, and the same code came back. this time the RPM gauge worked, however i still had the P0336 code. drove it back home, cleared the code, let it sit for about 7 hours and the car started up just fine, and didnt have a code.

In my eyes it has to be a heat issue, and its most likely something caused by the relocating battery. it only happens after the car is warmed up. ive read here that people say its starter getting hot, maybe it is, but ive owned the car for over a year now and the starter has never given me issues (now that ive typed that, maybe its a loose connection on the positive terminal to starter?). would like some more opinions by people that know alot more than me, thanks.

Several C6 electrical issues

kindofretired — Thu, 21 May 2026 14:47:02 GMT

I have several issues and will gladly take any helpful hints.

Issue 1. My instruments stopped working. HUD still works. I read various posts about grounds and cables disconnecting from the back of the panel, etc. I checked all that. Also the check engine light functions as expected in the panel. Will that still work if you have a ground problem? I am concerned the panel died. It drives just fine.

Issue 2. The day I had arranged to work on issue 1 I saw 2 new bigger issues. When I pressed the button to start sometimes everything electrical died in car. No lights, doors didn�t work, nothing. The only way to revive it was to disconnect the battery.

Issue 3. When I pressed the button to start everything electrical would shut down, then 10 seconds later come back to life with no action on my part.

So when I go to start my car and press the button one of 3 things happens:
1-it starts and runs great, but I have no instruments
2-it loses electrical for 10 seconds, then things like the radio and hvac come back and work just fine
3-it loses everything electrical, completely dead, until I disconnect the battery

This could be several different issues for sure. I am open to any ideas on where to start. I am hoping that someone has seen something similar and can save me some cycles.

If I put this in the wrong forum I will move it, just let me know.

Thank you,
Drew

07 Z06 no electrical power

26mconnolly — Wed, 20 May 2026 14:17:37 GMT

Hi all,
This issue is ONLY when the car is warm, and I go to drive it again before it�s cooled down. When it sits overnight, it�s fine.
the car doesn�t respond to the fob, I go inside manually and it won�t go into accessory mode or start mode. No electronics turn on.
All the grounds are clean, Bcm looks fine; haven�t tested internally, fuse box pins and all look fine
it has a class 2 data link code and a communication CAN bus error.
where should I look or what should I do next?

C6 Random engine shutoff issue

C6Esus — Wed, 20 May 2026 13:04:13 GMT

I recently purchased an 05 C6 ls2 base. I experienced a random shutoff while my car idled for about 2 mins. electronics stayed on , i then drove it home for about 7 mins, experienced two shutoffs , both gave me the "shift to park" message my dash stayed on however my engine cut off. I then scanned my car for codes & got a lean on banks 1 & 2. Mind you no CEL. I then took it my local shop & they recommended changing my MAF sensor. This could possibly be responsible for my shutoffs. We had then changed the MAF. Codes cleared. Nothing came back. After a week or so after driving i experienced another shutoff. dash still lit. mind you i have no experienced any other weird things with the car and the car still scans for ZERO codes. Looking for recommendations or suggestions.

Failed trunnion 2011 GS LS3

SIXSPD — Tue, 19 May 2026 18:49:51 GMT

Good afternoon. I've got a "situation". The stock trunnion on cylinder 6 intake valve failed and I�m recovering needle bearings from the top of the head. So far I�ve found 24 (of the 33). I�ve drained the oil and didn�t recover any there. Unfortunately the drain plug was not magnetic. I have found a significant amount of glitter (recovered on my magnet as I was searching on the top of the head). I�ve got a few questions for any of you familiar with this problem-

I�m pulling the heads to replace the valve (and inspect the others).

1. Assuming I don�t find the remaining bearings on top of the valley cover, should I assume the others moved to the oil pan?

2. If so, is there any reliable way to inspect it other than dropping the oil pan? I ran a scope up in the drain hole, but couldn't see very far. It�s got a BTR stage 3 cam and dual valve springs so I�m hoping it didn�t damage the lobes, cylinder or valve(s).

3. I�m replacing the rocker arms and push rods. Is there anything else I should look for or inspect while I�m in there?

I�d appreciate any words of experience or wisdom. TIA

HUD is loose

Gray Goat — Tue, 19 May 2026 02:08:56 GMT

Hey,
my HUD is loose and vibrating. It�s also slightly crooked.

is there an adjustment?
Thanks.
2006 M

2007 ZO6 Cam Recomendations

RTB412 — Mon, 18 May 2026 14:29:14 GMT

Hello,
Heads done by AHP. 3 inch ARH exhaust. Looking for recommendations for a cam? Also thinking I should upgrade the intake at the same time?

Welding vs Clamps Kooks Exhaust

rsb213 — Mon, 18 May 2026 01:09:26 GMT

Anyone ditched the clamps and welded up everything except the ball joint at the header and the connection point at the axle back? Just installed a set of 2" kooks headers and green catted xpipe and worried about scraping the clamps on speedbumps.

C6 GS ABS Brake Sensor Issue

2012CGS — Sat, 16 May 2026 14:17:12 GMT

I have a 2012 Grand Sport. In 2020 I began getting the ABS/Traction control disabled warning light.
I found a shop to scan for codes and came back with an intermittent on the right rear sensor.
I replaced the hub and sensor and everything was fine for several years.
Now several years and maybe 14,000 miles later, I am getting the same error.
Put a scanner on it and it came back with the right rear sensor again.
I thought I was putting a quality part on at the time, paid $225, not the cheapest or the most expensive.
Yesterday, I jacked up the rear and unplugged the sensor and just for fun plugged in the old hub.
The light went out. Unplugged the old one and plugged in the one still on the car and the light came back on.
I can put a new one on, but the price range now appears to be anywhere from about $49 for an import to nearly $400 for a Timken.
If its only going to last 14,000 miles, I'd prefer to spend under $100 then $400.
Anyone else have this problem, Comments?
TIA

Heads Fix

GUSJV — Sat, 16 May 2026 14:13:17 GMT

I know there is a lot of information about �head fixing� here. I am not a mechanic and not an IC motor expert by any stretch.

My question is this. If you send in your heads to have them �fixed�, what is being done to alleviate the problem? If they are just inspected and nothing is changed, that doesn�t seem to be a fix.

What needs done as a fix?

by the way, the search engine on this forum seems hard to use, so I know there is a **** ton on the issue�

Harmonic balance wobble

BET VETTE — Sat, 16 May 2026 00:51:25 GMT

How often are they and what sound does it make

Make it make sense - oil report

bwill03z — Sat, 16 May 2026 00:50:04 GMT

Long story short, I have non-magnetic glitter in the bottom of the drain pain on every oil change regardless of the miles on the oil. I�ve cut the filter open each time and the filter is clean, everytime. It�s a bone stock 2012 grand sport with 33k miles, bought the car at 31,500 miles. Oil pressure is great, no misfires and no unusual noises.
Got my oil report back and basically it�s normal. As it states in the report, their testing does not account for larger visible particles, but if there were an issue I would expect elevation in the microscopic particles also. The oil only had 975 miles on it and the universal averages for comparison are at 3800 miles�.But still overall this report looks promising. What the heck could be happening in this motor?!

New Headunit whining in passenger speaker

Cnbecker9 — Fri, 15 May 2026 22:41:02 GMT

Recently installed a new headunit (Sony 9000ES) with an Pac RP5 interface with stock Bose system. When the engine is running I'm hearing a whine from passenger 3" speaker that changes with RPM. Have not been able to get rid of whine. I unplugged alternator, added a chassis ground from ground wire on PAC, disconnected rear camera, nothing works. Crutchfield hasn't been super helpful so far. Have a new PAC interface on the way but not feeling very confident. Anyone have any advice?