Sorry, can't help it. You're correct, of course. But some of these cam names.... If I were 18 years old again, Id be looking for the damn "Wham, bam, thank you maam cam!!" 
Another cam thread, sort of.
Thread Starter
On The Tree
Joined: Feb 2025
Posts: 107
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From: England
Another cam thread, sort of. Hi all, been reading tons of info over last couple of years as I collected all my parts for my build. Taken a while as items not so easily acquired in the UK, but the time is near.
I have a pair of decently ported 799 heads, with new SS valves and BTR springs, polished 64cc chamber (skimmed by 20 thousands but valves are de-shrouded) . Will use LS6 intake.
LS3 6.2 Bottom end is full refresh and balanced with STD pistons, new rings & Eagle forged rods, so only going for normal rpm limits ~ 6500-7000 rpm
Car will be used for cruising to shows etc, so some motor way use, with some trailer use tower one if my other cars.
Weight is around 2500lbs + occasionally 2000lbs trailer.
Transmission is Auto (8speed ZF)
So I have ended up with a choice of 2 cams. And thinking what I should go with - this is the big question !
1) BTR Chuck Norris
2) Summit 8708R1
Was originally thinking the Chuck Norris, but better to ask the experts
Thanks in advance.
I have a pair of decently ported 799 heads, with new SS valves and BTR springs, polished 64cc chamber (skimmed by 20 thousands but valves are de-shrouded) . Will use LS6 intake.
LS3 6.2 Bottom end is full refresh and balanced with STD pistons, new rings & Eagle forged rods, so only going for normal rpm limits ~ 6500-7000 rpm
Car will be used for cruising to shows etc, so some motor way use, with some trailer use tower one if my other cars.
Weight is around 2500lbs + occasionally 2000lbs trailer.
Transmission is Auto (8speed ZF)
So I have ended up with a choice of 2 cams. And thinking what I should go with - this is the big question !
1) BTR Chuck Norris
2) Summit 8708R1
Was originally thinking the Chuck Norris, but better to ask the experts
Thanks in advance.
Last edited by Not_usually_UK; Feb 16, 2025 at 06:27 PM.
Thread Starter
On The Tree
Joined: Feb 2025
Posts: 107
Likes: 36
From: England
Added, but it’s an LS3 bottom end. Diff is 3.44 on 25” diameter wheels.
Headers are Hooker block hugger into twin 2.5” system. No cats. As it’s space limited this is a fixed limitation , so no option to change.
TECH Resident
Joined: Jun 2011
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Your compression ratio is probably a little on the high side for the Truck Norris, and you could use some more intake duration to compensate for the LS6 throttle body. The SUM-8708R1 is much too big for towing even the small weight (don't forget theirs trailer weight in addition to whatever vehicle is on it), the exhaust valve closing (EVC) is too late for shorties, and you'd probably have piston-to-valve (PTV) clearance issues.
Between the shorty headers and wanting some towing capability, I'd suggest the @Summitracing SUM-8715R1 222/234 115+3 .600/.575, The -2* EVC will work with the shorties, and it should still tow around the combined weight okay. Always check PTV, but it'll be much safer with the 8715R1 than the 8708R1.
Between the shorty headers and wanting some towing capability, I'd suggest the @Summitracing SUM-8715R1 222/234 115+3 .600/.575, The -2* EVC will work with the shorties, and it should still tow around the combined weight okay. Always check PTV, but it'll be much safer with the 8715R1 than the 8708R1.
Thread Starter
On The Tree
Joined: Feb 2025
Posts: 107
Likes: 36
From: England
Your compression ratio is probably a little on the high side for the Truck Norris, and you could use some more intake duration to compensate for the LS6 throttle body. The SUM-8708R1 is much too big for towing even the small weight (don't forget theirs trailer weight in addition to whatever vehicle is on it), the exhaust valve closing (EVC) is too late for shorties, and you'd probably have piston-to-valve (PTV) clearance issues.
Between the shorty headers and wanting some towing capability, I'd suggest the @Summitracing SUM-8715R1 222/234 115+3 .600/.575, The -2* EVC will work with the shorties, and it should still tow around the combined weight okay. Always check PTV, but it'll be much safer with the 8715R1 than the 8708R1.
Between the shorty headers and wanting some towing capability, I'd suggest the @Summitracing SUM-8715R1 222/234 115+3 .600/.575, The -2* EVC will work with the shorties, and it should still tow around the combined weight okay. Always check PTV, but it'll be much safer with the 8715R1 than the 8708R1.
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On The Tree
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From: Las Vegas, NV
Thread Starter
On The Tree
Joined: Feb 2025
Posts: 107
Likes: 36
From: England
And I really wanted to only select one if what I already had, as each cam change costs about $700 by time it’s got to UK, +duty +tax here.
On The Tree
Joined: Jun 2022
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From: Las Vegas, NV
You can see what specs they recommend and get something similar... I believe for the most part they grind their cams to order, at least they did for me when I ordered a LS3 stage 3 high lift cam from them. Took about 1 week to ship out. I guess you can talk with them and see what the shipping and duty costs may be and see if that is reasonable. Be sure to get a set of genuine GM lifter trays and some high quality lifters like johnson 2110r's or Cadillac racing lifters and either the CHE or Smith brothers trunion kits to beef up the valve train.
Thread Starter
On The Tree
Joined: Feb 2025
Posts: 107
Likes: 36
From: England
You can see what specs they recommend and get something similar... I believe for the most part they grind their cams to order, at least they did for me when I ordered a LS3 stage 3 high lift cam from them. Took about 1 week to ship out. I guess you can talk with them and see what the shipping and duty costs may be and see if that is reasonable. Be sure to get a set of genuine GM lifter trays and some high quality lifters like johnson 2110r's or Cadillac racing lifters and either the CHE or Smith brothers trunion kits to beef up the valve train.
