ajrothm

Dems some big holes! That thing is gonna be a screamer.

You may be on to something with that 244/256...

You gonna dyno it after it’s built?

Neil B

Yes, it'll go on the dyno before it goes into the car. I'm agonizing over whether or not to port the heads. It'll make plenty of power either way, but I'm sure you know how that goes.

69ttop502

Awww come on Neil go ahead and port em! You know you will be sorry if you don't. Love the build.

ajrothm

Yes, port them now for sure. You'll regret it later if you don't.

Never have to wonder "what if?"...

Neil B

So true. It's tough to know when to say when.

427Hotrod

Power is always in the heads......


JIM

cv67

When you can look back and say "I did about everything within reason I could to eek power out of it".
Every head out there even the nice cnc'd ones have room for improvement doesnt take much just someone who knows what they are doing.

Neil B

Ok, you got me there.

Neil B

The heads arrived. Good initial impressions. I did a quick snap gauge check on the pinch CSA and got 3.04 sq. in. This should be enough for my 6,500 rpm goal. The CNC'd chambers look good. I can feel a pretty big ridge on the exhaust short side radius where they did the CNC blend. At a minimum, I'm going to disassemble the heads, check seat runout & guide clearance, and hand smooth the CNC bowl blend they did at Brodix. The intake runner port match also has a decent ridge on it. I don't have the intake yet, but if the manifold ports are smaller than the head port with no overlap, I'm probably going to leave the intake runner alone with no additional blending. The intake guides seem crazy long. Does anyone know why Brodix makes them so long? Would I gain anything by cutting them down? I need to pull the valve and check the throat CSA.

Neil B

Here are the intake ports.

cv67

id leave the guides alone no real advantge to shortening them; heads look nice. Doing your homework checking ea piece

What intake are you running I musta missed it

Neil B

A Performer RPM is about all that will fit under the L88 hood. I don't think it's a terrible choice in my intended RPM range but I'm open to ideas.

v2racing

I've never seen any significant gains on the flow bench by shortening them. A longer guide gives the valve more stability and will live longer.

Good idea checking everything over. Just under the seat and the short side radius are the most important areas of the port. Smoothing those areas will help.

Mike

Vortecpro

What he better ck is the valve job.

v2racing

Oh, I agree completely. He said he was going to check seat runout and guide fit though. The seat and valve shapes are the most critical area in a port. I've picked huge flow working these areas without touching the rest of the port in off the shelf top name brand heads on both the intake and the exhaust.

Mike

Neil B

Mark, I've been watching your Youtube videos on this. I'm shocked how these heads are being shipping with .005+ runout. How is that even possible? Are they not cutting the seats by indexing off of the guide? I'm not up to speed on the state of the art in head machining.

Vortecpro

You think those are bad? .005 run out bad? Are you prepared to come on here and tell us your results? Get ready to be shocked, Brodix is probably the worst offender out there, and they could care less, You want a long guide for support, it will not effect flow.

v2racing

A head machine, or any machine for that matter, is no better than the person running it.

Mike

Neil B

I would be happy to post my results. If it isn't right, we'll make it right.

Neil B

Agreed. But how does a cutter get that far off center when the pilot is centered in the guide?