THE ULTIMATE STOCK LS CYLINDER HEAD TEST! (241, 799/243, 317, 706)

706 5.3L HEADS vs 241, 799/243 vs 317s. WHICH HEADMAKES MORE? We compared the four most popular stock LS heads in a back to back shootout. We ran the 706/862 (4.8L/5.3L) heads against the 241 (LS1), 317 (6.0L truck) and 799/243 (LS6/L33) heads. This test was run on a modified 5.3L with a cam, headers and Fast LSXRT intake. We also compared the 706 vs 799 on a larger 6.0L with interesting results-video to be up soon.

[Dylanschillin]

Love how the audio switches from left to right periodically

[CJSFBRD]

Definitely on the wild side of the 5.3L builds, love the knowledge. I have 317, 241, 862, 706, and home ported 799s milled .015. I just bent then broke a valve on the 799s (end of season was trying to make it by) The 5.3L piston blew into pieces so much that it is just a rod wrist pin left on the crank. New junkyard cam swap engine going together and I'm going to try out the 706 heads until I get the 799s repaired! Thanks Richard

[dekebell]

Frickin wizard Holdener never fails to impress! Thanks for sharing sir!

[briangrogan]

So interesting... I kept my old 706 truck heads even though I was looking for 799s. Maybe I already had a diamond in the rough.

[dru]

Buying 706 heads TODAY cause of this video thanks 😎

[joeinmi]

Thank you. I had a LS guy from back in the day tell me the stock 4.8/5.3 heads with a valve job were pretty hard to beat. Turns out he was spot on.

[mattangelo]

Thanks for the test. I'm building a lq4 for my humvee ls swap. And definitely putting the 706 heads on I want that low end torque. U the man

[EvanAxer]

Awesome so my L33 5.3L with 799 heads isn't that bad of a motor! Pretty happy with the potential in that engine.

[jaywalkin]

I was always under the impression 706 heads were worse than the 243 heads!

[genemounce]

I'm liking the short and to the point video's better for sure big H.

[robertburton]

Great content for the 5.3 thanks brother!!

[cmdr_stretchedguy]

Happy with the stock 862 with stage 1 cam in my 06 silverado.

[frankstoner]

I'd like to see a dyno run of the trick flow 216/220 .560 lift, 114 l/s cam with pac 1218 springs, with the 706 heads, holley single plane intake, CSU 650 cfm on 5.3. Im building one right now with an on3 78/75 turbo. I love watching your video. Very informative. Thnx

[avadeal]

Thank you just helped me identify this 6.o

[shawnlibby]

I really would love to see some testing done on a 5.7 LS1 GTO motor aluminum block I like to see what the 706 does versus the 243 and 317

[buddybrackett]

Thanks summit yall are really putting in test time good jon

[francisbeaudry]

real nice infos rick ....tanks so mutch, ,,merci beaucoup

[JKZ]

Everyone is always trying to get top dollar for some clapped out 243/799 heads on fb all the time with parts missing... all you really need is a set of milled 706 heads (.20" about a 58cc chamber) and a good valve job with the installed height of the springs in spec, and you're good to go! That's what I run on my trucks, and it always makes for a good combo. Flow numbers aren't everything, combination is just important. If your cam lift is .550" you don't need a head that maxes out flow at .650"... you'll never utilize the extra flow. Great comparison for the real world bro!

[bigal]

The 821 LS3 heads are a great factory head.

[pjcooper]

I have both the 706 and 862 heads... think I'm going 862 on my 5.3 build, as I understand the 862 is simply a better casting quality of the 706 head. I'm going to stick with a truck intake manifold and go with around an 80mm throttle body to keep bottom end torque. I'll be using true flat top standard bore pistons with BTR pushrods and BTR springs, with a Howard's Rattler Camshaft. Finally a 3, 000 - 3, 200 Yank Converter. Should motivate The White Devil 😈 decently!! Great informative video Brother!!!