Dorman LS2 intake 6L
Thread Starter
Joined: Apr 2006
Posts: 5,606
Likes: 1,150
From: Pittsburgh
Dorman LS2 intake 6L Speed Secrets did a 706 vs 799 head shootout using a 6.0L with a DLS2 intake. On a 6L the 799 heads produced 9 hp more at peak but in the midrange the 706 heads produced 12 ft pd torque more. The surprise, the DLS2 intake was capable of producing over 500 hp. IIRC 522 was peak.
TECH Senior Member
Joined: Jun 2016
Posts: 22,293
Likes: 3,617
From: Central Cal.
TECH Fanatic
Joined: Dec 2005
Posts: 1,414
Likes: 28
TECH Senior Member
Joined: Jun 2016
Posts: 22,293
Likes: 3,617
From: Central Cal.
I'm no expert, but I've read/heard that the valve seats are usually 30/45/60 degrees with the 45 being the contact area, and the valve is 45 with a back cut to improve flow. I have forgotten the back cut angle. Some shops may use different angles, but the above is common.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Apprentice
Joined: Apr 2019
Posts: 365
Likes: 133
From: California
My local junkyard has plenty of GM LS vehicles with 862/706 heads. I got myself a pair of 862 heads to practice my porting on along with the 241 heads off my Camaro. If you have spare cash/funds get a set of ls heads to mess with.
I'm no expert, but I've read/heard that the valve seats are usually 30/45/60 degrees with the 45 being the contact area, and the valve is 45 with a back cut to improve flow. I have forgotten the back cut angle. Some shops may use different angles, but the above is common.
if you've ever looked closely, i've seen that LS intake valves seem like they already have a sort of cast-in back cut already, so i'm not sure how much it would help.
On The Tree
Joined: Sep 2016
Posts: 103
Likes: 18
ive been taught, and read enough, that 30* is usually the go-to for improving flow in the lower lift range. But that was always on sbc/bbc with the 23-26* valve angles. Getting more and more interested in the ls platform........I'd be curious to know how/if the more shallow valve angles would require something close to 30*, or wildly different.