New intake or keep old?

[wickedblkgt]

I have a fully forged 4v Teksid block that I'm looking to get 750hp/800hp with a single Borg Warner turbo. My question is should I keep the stock 98 cobra intake manifold or go with a high dollar sheet metal intake (MMR). what is everyones thoughts/ experiences? Pics help

[Whiteboy]

so you have b heads?

[wickedblkgt]

Good question, lance might know? I do know that it has had a 5 angle valve job.

[shumpertdavid]

96-98 are B head motors, they have 2 intake ports per cylinder. One is round, the other square. There aren't many aftermarket options available and they are generally expensive. Common mods for those are having the factory runners in the intake removed, shortened, and put back it as well as doing IMRC deletes. The 99 up 4 valves are referred to as C heads, they have one large oval port feeding both intake valves. Sullivan makes a single plane short runner intake that accepts various different inlet designs, and they do the short runner mod to them as well.

[dee]

96-98 are B head motors, they have 2 intake ports per cylinder. One is round, the other square. There aren't many aftermarket options available and they are generally expensive. Common mods for those are having the factory runners in the intake removed, shortened, and put back it as well as doing IMRC deletes. The 99 up 4 valves are referred to as C heads, they have one large oval port feeding both intake valves. Sullivan makes a single plane short runner intake that accepts various different inlet designs, and they do the short runner mod to them as well.

The b heads tend to respond very well to boost as well. The only downside is they don't seem to make as much torque.

[91CoupeMike]

Keep the cobra manifold. Sullys are pos below 5k rpm.

[wickedblkgt]

is it worth the effort to shorten the stock runners?

[crapstang]

is it worth the effort to shorten the stock runners?

There is a thread on this: http://www.dfwmustangs.net/forums/sh...t=10535&page=2

[wickedblkgt]

Thanks Max, so I'm guessing that there is no need?

[shumpertdavid]

Generally it comes at a loss in lower end torque which the 4v's tend to lack anyway. I run it in stock intake form and shee how the numbers fall, then decide if it needs intake modding or swapping down the road. The IMRC deletes generally take a little low end torque away as well from what I remember, but eliminate the possibility of them sticking and causing issue down the road.

We are putting together a vortech setup in a buddies 97 Cobra. It will likely get deletes and run the intake as stock, might add a plenum spacer but that's about it.

[dee]

Are you just going to take the factory IMRC blades out? I didn't think they made the delete plates anymore.

[wickedblkgt]

there is a hand full of company's that make them, I am probably going with MMR with an MMR intake spacer.

[91CoupeMike]

Are you just going to take the factory IMRC blades out? I didn't think they made the delete plates anymore.

Remove and jb weld and smooth the holes.

[dee]

Remove and jb weld and smooth the holes.

That's what I figured. Only downside is the 98 year is preferred but very expensive to find.

[shumpertdavid]

Remove and jb weld and smooth the holes.

I read about that and some using epoxy or small freeze plugs, I don't recall any problems as a result. However, for a couple hunded bucks for a machined pair I figured the piece of mind was worth it. If a piece if hard fled or a freeze plug worked loose it wouldn't be good going through a motor.