MikeGyver

iTrader: (5)

If you are looking for a cathedral port TBSS/NNBS manifold and the seller only has pics from the top, it is pretty easy to tell the difference now that I have them side-by-side.
The bottom pic shows that the injectors point into the "attic" of the cathedral.
The top pic is square ports.

Wolftrk99

iTrader: (5)

What part number injectors are those on the rectangular port

Wolftrk99

iTrader: (5)

Not to mention fuel rail bolt placement tbss/cathedral port/4.8/5.3 are inside rails, the l92/ly6 are outside....

splinter

Some sexy OE LS manifolds tested here...

20 LS1 Intake Manifolds: Tested!

MikeGyver

iTrader: (5)

I know. That is the December Hot Rod Magazine article that made me buy a new used manifold. I originally installed a Vic Jr because internet hype suggested everybody was melting their number 7 piston because the truck intake manifold was imbalanced, sending too much air to the rear cylinders.

MikeGyver

iTrader: (5)

So this dyno test in the magazine shows that the TBSS manifold gave 50 more horsepower at 3500 rpm my Vic Jr. I hope the results aren't way skewed because they had a carb on the Vic Jr.
Anyway, magazines are the devil.