The 6.0L Rematch-Stock 706 vs 799 Head Test

Previously, we compared the stock 706/862 heads to the 799/243 heads on a cammed 5.3L test motor. There was much uproar among 799/243 head enthusiasts. Thanks to smaller factory chambers, the 706 heads had more compression. The added compression helped the stock 706 heads make more power on the small-bore 5.3L, but would that continue on the larger 6.0L?

[daimyo_one]

I just wanna say thank you. You made me realize to stop dumping money in to my L59 and just swap it for an Lq4 👍🏾👍🏾

[philipstanley]

These are the kind of vids truck guys want to see. More please!

[armedrepublic]

I just had this argument! Lol now I have a video to back me up. Thanks Richard!

[Its_Bobbys_World]

I see what’s going on here ... but with that much duration most of us truck guys aren’t going anywhere near that unless we have a 4K stall is really like to see this year with a btr stage 2 or 3 truck cam or any cam within those specs. Anyhow always the good work Richard !

[LaserLuther]

Truck intake, truck cam on the same setups would be cool. Great Video!

[mikeycornwell]

Glad your finally making vids, thanks for all the info so far.

[Notoriousfcs]

I wonder how a ported set of 706 heads with a valve job would do. I wonder if you would lose a little down low for gains up top or if it would just make more all around.

[BadLuckGarage]

This was a great test. Want that 12 torque back? Mill the 243/799 heads. It’s gonna make even more lower and torque. That extra torque down low with the 706 heads is all in the compression.

[Fehrway_Engines]

I would love to see a apples to apples comparison between the 4.8L and a de-stroked 6.0L!! Does the bigger bore really help. -Same compression ratio -Same camshaft -706 heads on the 4.8L and 823 heads on the DS6.0L -TBSS intake on the 4.8L with a comparable truck intake on the DS6.0L. It’s been talked about for ever but never tested that I know of!!!

[HoosierDaddy]

Awesome!! Ive got a pair of 862/706 im working on for my lq4. Glad to see it does pay off below 5000 where i want it

[ryanlphipps]

That's an awesome video. I got a stock 6.0 with 317 heads. I saw 706 heads on a 5.3 at the junk yard today. I'm going to go get them and get them cleaned up and get that comp cam and springs you showed on the video. Thanks again. By the way know anyone that is selling a 6.0 in Georgia or Alabama?

[davidwickboldt]

But if you unshroud the valves in the 706 heads with some bowl work. They would gain on the top and still have the bottom advantage.

[JKZ]

I always mill the 706 to a 58cc chamber and do a killer valve job on them... they will do anything the beloved 243 heads will do at half the price!

[boostdsierra]

I'm curious about what the power would be like if both combinations shared the same compression ratio. we all know the 706 heads usually come on top because of the increased compression but what it the 799/243 heads were milled to the same 61.5cc of the 706 heads

[coreyshort]

I'd like to see how those 706 Heads would do in the same test but using a 2.0" intake valve.

[ryurc]

I recently bought a 5.3 for core price, it looked nice inside, just researching 799, I'm putting it together just stock and put it in a 5speed 2 door blazer oughta be fun

[joew]

What if you kill the 799s to the same compression ratio as the 706s?

[rodney]

I wonder how the 706/862 heads are gunna be with my BTR stage 4 cam.

[Swiftshifter]

Minor note, the cam is Richard's tried-n-true 54-469-11 (not the 54-459-11) about the largest you can run with OEM pistons for PTV clearance, per many of his videos. I freakin' love this channel!

[TE]

Why didn’t you use the 706 heads that you diy unshrouded the valves for the 6.0 motor?