2004 6.0 NV4500 Tahoe

[randeez]

you should thread each one in and file it down to contour the port...a hole is worse for flow than a nub

 

[Dantheman1540]

I don't have a race truck so I wasn't all that concerned with it. Honestly, the only reason I have ported heads is because I didn't want to wait on a valve job on the stockers.

Cut the bolt off and send-er.

I can't remember who on here had some ported heads and was questioning that bolt hole being exposed after porting, a while back. Thats what made me remember my camaro smoking because the oil seeping past the bolt and having to seal it. If you compare what's there on a stock head, vs that little bolt, I think thats why they say its not a huge deal. Obviously it will hurt the flow some, but IDK if its a single HP or not

Just teasing you although I still want you to tune that turd and be amazed with the power you unlock.

Cut them off I shall!

you should thread each one in and file it down to contour the port...a hole is worse for flow than a nub

Got data to back that up? I thought a hole would just be passed over although I suppose it could create a point of turbulence or some sheet idk I’m not an aeronautical engineer. Although I do have a degree in aeronautics from a fairly decent school .

 

[pwtr02ss]

Just teasing you although I still want you to tune that turd and be amazed with the power you unlock.

Cut them off I shall!

I do need to do that. Talk dirty tune talk to me and maybe something will click and make me do it or try to find someone to do it for me.

That 15 mpg is nearly enough motivation to get something figured out. Would like to be 19 range...

 

[Dantheman1540]

I do need to do that. Talk dirty tune talk to me and maybe something will click and make me do it or try to find someone to do it for me.

That 15 mpg is nearly enough motivation to get something figured out. Would like to be 19 range...

This $4.09/gal premium ain’t no joke, I’ll probably get 13-14 now instead of 15-16. Yay me.

 

[pwtr02ss]

This $4.09/gal premium ain’t no joke, I’ll probably get 13-14 now instead of 15-16. Yay me.

Yup. Fortunately I kept the avalanche on the 87 diet but the Yukon gets premium. Went from 3.75 to 4.09 here YESTERDAY

 

[Buggdave]

I ran into the same issue when installing my heads on my build last night, steam ports are only open on one side of the head. Since my iron 6.0 block had the rear water jacket under the rear steam port sealed, I decided to swap the heads to the other side. I understood that you could reuse your head gasket after torquing if they were not Heat Cycled.

 

[Dantheman1540]

Yup. Fortunately I kept the avalanche on the 87 diet but the Yukon gets premium. Went from 3.75 to 4.09 here YESTERDAY

We made that jump two weeks ago, only gonna get worse as summer kicks in. I'm definitely going to have the low octane spark table dialed in so I can run the fuel of the poor.

I ran into the same issue when installing my heads on my build last night, steam ports are only open on one side of the head. Since my iron 6.0 block had the rear water jacket under the rear steam port sealed, I decided to swap the heads to the other side. I understood that you could reuse your head gasket after torquing if they were not Heat Cycled.

I find it so odd they left those ports closed, I'm just gonna drill them out with a vacuum sucking the shavings as I drill. It will take less than 5minutes to drill instead of the half-hour it takes to pull them, swap them, and retorque everything. Then I won't run into that problem again down the road either.

 

[Dantheman1540]

So I sorta had my 862 heads sold but I think I'm gonna keep them for a while. I still have a 212/218 cam on the shelf and that combo is a heck of a bump up on an LQ. Hopefully, I don't need them for a JY short block anytime soon and maybe I can send the heads out to get ported, comparing the ported 862s vs ported 243s there's not much flow difference so they wouldn't be a bad option for a future build.

 

[randeez]

Just teasing you although I still want you to tune that turd and be amazed with the power you unlock.

Cut them off I shall!

Got data to back that up? I thought a hole would just be passed over although I suppose it could create a point of turbulence or some sheet idk I’m not an aeronautical engineer. Although I do have a degree in aeronautics from a fairly decent school .

a nub just creates turbulence. a hole creates a low pressure zone which acts like a venturi that will either suck more oil in from the head or "hold" onto the air passing by it

 

[pwtr02ss]

We made that jump two weeks ago, only gonna get worse as summer kicks in. I'm definitely going to have the low octane spark table dialed in so I can run the fuel of the poor.

Wait until you see what it is today...