When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
When I first had my 406 on the Dyno it made 545 rwhp. I had my old drag radials on the car for tuning. I replaced my drag radials and with the new drag radials on I put it back on the Dyno and it made 526 rwhp. The new tires were stickier and softer and wrinkled more during a pull . Both sets set at 25 psi.
My original cam was an old comp cam grind for a stroker.
247/255 624 /624 on 114LSA
The solid roller is a cam motion grind .
250/266 680/642 on 114LSA , .010 hot lash
The solid roller made around 20 rwhp peak than the Hydraulic and carried to 7400 before it started to fall off.
Very nice, I would say that was worth the effort for sure. The whole curve looks better. Car should go way faster, even with no other changes. Job well done👍👍👍
Thanks guys. We tried another degree of timing for Pro Stock John. It was just enough to get me over 550. It was worth almost 3 Hp! Where the hydraulic fell off I'm up 30-40 with the solid roller.
I'm planning on moving my shifts up to 7400.
LS3 heads, 821 casting with factory valves, cam motion spring kit, 3/8" pushrods, Yella Terra adjustable rockers.
The rockers created their own problems. I bought a set of tall Holley valve covers because I was told they would clear the rockers by a reputable builder. I clearanced the valve covers all I could on the sides and they still will not clear these adjustable rockers. They may clear the non adjustable ones. I don't care WHO tells you they will clear they will not clear the Adjustable LS3 rockers. I ended up buying the aluminum spacers from Yella Terra and got them to work but I have been fighting oil leaks .
I have T&D steel adjustable rocker arms and for the longest time I was running a stock valve cover with the ICT 3/4" spacer but I had to clearance it due to the locking nuts making contact with the spacer. I thought when I moved over to the Summit LS tall covers my issues would go away but that wasn't the case because I had to clearance those too. I imagine the aluminuum rockers are bit bigger so I can see that even being more of an issue.
I had to cut the baffles out of the top of the Holley tall valve covers because the adjuster nuts were hitting where the baffle was actually attached to the valve cover. The side clearance was a lot worse be cause of the way the rocker heal sticks over the top rail of the head. You have to clearance the head on the side so the rocker don't rub it also
You can see where I had to make clearance on the side of the covers. I removed all I could and still didn't have enough clearance with the Holley Tall valve covers. I have the aluminum 1" spacers from Yella Terra and a stock height valve covers on now.
Yep, I had to break out the dremel and eat 16 dimples into the 3/4" spacer and then did it again with the new valve covers in order for those 12pt nuts to not make contact. The rocker arm bodies did make contact with the Brodix heads at each of the end rocker arms. I did that with the heads on the car and that was a chore within itself.
Recently replaced the PAC .660's with their 1207X springs and being that it was my first time doing that with heads in the car wasn't much fun either. Oh the joys of hot rodding!
LS3 heads, 821 casting with factory valves, cam motion spring kit, 3/8" pushrods, Yella Terra adjustable rockers.
The rockers created their own problems. I bought a set of tall Holley valve covers because I was told they would clear the rockers by a reputable builder. I clearanced the valve covers all I could on the sides and they still will not clear these adjustable rockers. They may clear the non adjustable ones. I don't care WHO tells you they will clear they will not clear the Adjustable LS3 rockers. I ended up buying the aluminum spacers from Yella Terra and got them to work but I have been fighting oil leaks .
I was in the same boat. Fighting oil leak with valve cover spacers. Bought summit tall vakve cover and they clear my big T&D 1.8 rockers with huge lift. Very happy with it.
Some of the rockers were notched near the adjuster nut at the back. I guess it helps for clear heads and covers.
I think I would have been better off with a different set of rockers. I had to cut clearance for every rocker on the heads themselves because of the way they hang over so much. This is probably my first and last set of Yella Terra adjustable rockers.
I was in the same boat. Fighting oil leak with valve cover spacers. Bought summit tall vakve cover and they clear my big T&D 1.8 rockers with huge lift. Very happy with it.
Some of the rockers were notched near the adjuster nut at the back. I guess it helps for clear heads and covers.
I just wanna say that the Summit tall valve covers DO NOT CLEAR the rockers finally; Cold they do clear, but barely because at HOT running temp, I could hear a tiny metallic sound.
I opened anyway to check my hot LASH which was fine 0.010-0.012'' (cold at 0). So the valve covers clearance were less than 0.010 cold. I took the grinder and removed some material at very point it could touch the adjuster nut (I could see the nut was missing some paint) and in the bottom corner of each they were some scratches.
Man alumium is a PITA to clean after. If it needs more grinding I will tape everything with paint tape so I dont have to clean this for 2 hours...
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.
7 Most Reliable High-Performance Engines GM Has Ever Built
Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
406 Hydraulic to Solid Roller cam results 
