Did the same thing myself with Streetwize help.

One more pic that shows the plenum of my Hughes plenum-modified RB M1 intake. This is NOT how it came from Hughes, and I ended up putting quite a bit more time into the intake, primarily runner sizing and entry work.

I meant Strip Dominator. Sorry for the kornfusion.

I have never checked a BB intake to see if the TQ fits, but I've never seen a TQ fit the Strip Dominator without modifications, and sometimes welding.

That's what I do.

I only do it if it port the entire intake, because the times I have tested it, if you don't do it all, there is almost no power.

And I've tested it both ways...porting the intake without fixing the top and fixing the top without porting. There is always a gain when you do both.


I typed that out and confused myself. If you separate it all out, you need to port the intake to see any benefit to fixing the top. At least in my testing. I've seen 35-40 HP from just porting the intake and another 12-15 from fixing the top. Also, the tune up is easier when you fix the top.


I charge $850 to port the intake and weld the top. It's a PITA but it's worth it. Convincing guys to do it is another thing.

This is another one of those "I'd have to go digging for the paperwork to be sure" things, but IIRC we tested that intake w/ a standard 1050 Dominator during our last dyno session, and it made about the same power as your CFS annular 4150 on my plenum-ported Victor did... 620+ HP & 580-ish torque?

It was just a quick swap and no time was spent trying to tune the 1050, which I seem to recall as showing a bit lean when I looked over the A/F ratios on the printout later.

Bobby loaned me a Street Dominator that I tested last summer. Back to back weekends as cast vs. ported, I consistently picked up a 1/10 in e.t. and 1 mph. I purchased it and it is on my car now. Translates to 12-ish HP?

I bought another Street Dominator this evening. My plan is to modify this one when it comes in and do back to back testing against one that has had no modifications. Good chance I'll throw them on the flow bench as well. I'll report back with my findings. Just give me some time though, the cars are a bit back on the priority list right now. -Trent

Got my intake back from the machinist today. I had him weld up the intake plenum and close up the EGR holes that were left when I cut the EGR garbage off. I'll keep you guys updated as things progress.

Looks great! Are you going to smooth the transition from the car flange to the plenum a bit?

That's the plan. It'll be a couple weeks before I get around to it though. The transmission in our daily driver took a crap so I'm elbow deep in that project right now. Mix that with being in the air conditioning industry this time of year and free time is a bit hard to come by.

I'll keep you guys posted though as I make progress. I'll be anxious to compare the two intakes to see how much the mods are really worth.

Nice looking work on that intake so far.

It'll be interesting to see what kind of difference you see in track performance.

Thanks!

I see a LOT of in your future.

True story.

It wouldn't be so bad if it weren't aluminum. I probably spend as much time cleaning the bits as I do actually grinding. I was told to try bar soap on the bits to prevent loading them up with aluminum. Anybody have any other suggestions or know if there's any truth to the soap trick?

Sounds like your bits are too fine.. but you
can use WD40 also.. either spray them or get a
small bucket and dip the bits in and let them
drip off for a minute then use it.. I just spray
them but it cost a touch more this way

Soap trick works!

I use to use soap when I was cutting a lot of
alum with a circular saw(I use to build Burger
Kings and did the windows so I did a lot of alum
cutting.. but I use WD when grinding alum.. but
the bits have to be right also.. fine will load
up pretty easy.. but a course but wants to catch

I did some SERIOUS work on a W-9 intake.. it was
the first one cast and they were gonna pitch it
so I grabbed it and started playing with it.. it
was easier to cut it in half to work on it then
weld it back together
EDIT
I modified this to fit a dominator which wasnt
normally done

Just a quick update...

I spent some time this afternoon blending the runners into the plenum. The picture doesn't do it much justice, nor am I finished but the corners are coming along.

I'm leaning towards thinning the dividers down a bit but will probably try to keep them more rounded than knife edged. I was told knife edging was actually worse for flow although I personally haven't tested that theory.

I missed your last post Mr. P but I can imagine cutting the intake in half made things a ton easier to work on. Part of me wants to keep track of how many hours I'll have in this intake, the other half doesn't. Hope it's worth the hassle in the end. Time will tell I suppose.

Coming along nicely. Make sure the port has some taper. It should be bigger at the plenum than at the flange. Not sure you can get as much as you need without more welding, but get what you can.