I see the ls ports are above the plenum a couples inches out of the box. Be nice if they had interlocking stackable runners (for inside plenum) in 1/4-1/2 thickness to make it easy to tune "or stuffers". That was a new one for me as well. Lol...

Your head guy JIM V has been using/making stuffers for ever....intake and exhaust ports LOL.

But then the LS get's all the cool stuff

How much is one of those for a tall deck.

Awesome!!!

Sometimes we just call it welding. He's raising my floors right now. No stuffers though but ya I know what your refeering to. It's funny I had one of his personal sets of BBC dart cast heads epoxied in 88 or 89.

They fit through the opening. The ports inside are flush with the plenum, the runners are cnced billet so the stuffers can be made to fit precisely over them.

Top mount TBs will always be better if you have the room.

Ive also read sime anecdotes that cast manifolds are usually better than the fabbed ones.

Not always true remember your just flowing air.
the problem with cast ones your stuck with the limitations of the design.

I figured I would pitch in here. Forgive me if I forget some exact details, it has been a while

I did a decent amount with tunnel ram's back in the late 70's/early 80's. When I first started with this stuff a big name engine builder did my engines and tried the Weiand's with some spacers. Probably 3" or so. Made great numbers on the dyno but the first time in the boat broke the snouts off both crankshafts! Looking back it was probably due to lousy distribution but what did we know about that back then? So much for the big name engine builder.

So - I decided I could do no worse on my own. Moving on I was lucky to hook up with a local shop (Pro Motor) that had a good reputation and one of the few dyno's around Chicago. And more importantly Peter (the boss) went along with some of my ideas. We built some 540 inch motors with Rehr Morrison heads. Pro did the machine work and I did the assembly.

At the time I also had a great relationship with the local warehouse distributor. The WD was nice enough to loan me a couple of manifolds, tops, Dominator's, and 780's. Tried single 1050's, dual 1050's, dual 780's and a single plane 1050.

Edlelbrock Victor was the best. Back to back - the Victor w/780's made more torque and power than the 1050's. I don't remember the exact number but I think after some cam swaps and tweaking we wound up close to 800 HP @ 6000 RPM.

These engines were rebuilt once a year every fall. And every rebuild they went on the dyno. Always looking for more power I kept trying new stuff. Carl Foltz (CFE) was just starting out at the time. Carl did the intakes for me and BAM - more power. Did some bigger carbs with side inlet bowls to fit the manifold - more power. Better oil pan - more power. At the end had about 850 hp.

In regard to the original post - hell yes to tunnel ram's. I would never do carbs again, EFI for sure.

Here is a picture of the Weiand, looks like the spacer was not as big as I remembered. Bottom line - it didn't work