B2 Motorsports - Jeff Lipton 487 FE Build

[blykins]

Low lift is a lot of it, and yes, you want a well flowing head with the smallest port possible. Everytime I say that, I think of the CHI Cleveland heads. They are a mix of old Cleveland 4V head flow, with old Cleveland 2V head port velocity. Best of both worlds.

That's also why the AFR and TFS heads work very well. The 185-205cc heads flow better than most 210-225 heads flow. Good velocity.

I'm not knocking Blair's services by any means. I have talked to Blair quite a bit over the phone and emails and have even got his advice on some things. However, I would weigh the "cost-effectiveness" of a head that requires that much labor in comparison to an out of the box head, or a readily available CNC head.

Of course all of this pivots around the camshaft selection too. A cam with .750" lift doesn't lean fully on a head that moves big air at .200" lift. The valve job has a lot to do with performance at the low lifts and when you back cut the intake valves you start to see that in action.

[Cobrafan1]

Does a better flowing head allow for a smaller cam??

[blykins]

Yes it does.....it affects cam selection quite a bit. You don't have to hold the valves open as long to get the food shoved in.

[olddog]

Originally Posted by blykins

Yes it does.....it affects cam selection quite a bit. You don't have to hold the valves open as long to get the food shoved in.

This is why I have always suspected the Boss 302 was a dog at low rpm more so because of the cam and intake, than the ports. Yes the port are huge, but the cam and intake was also for high rpm.

Everyone focuses on the heads, but the port is quite short compared to the intake. I suspect the intake has much more to do with velocity and air momentum than the heads.

I would love to see a mild roller cam in a Boss 302 compared on a dyno to a factory issue. Followed by some choice intake swaps. Wish I had the resources to play.

[ERA Chas]

Originally Posted by blykins

YYou don't have to hold the valves open as long to get the food shoved in.

Sounds like 'New Daddy' talk....

[blykins]

The issue is the 230cc port volumes. Even the 351's with the 4V heads didn't have a lot of butt.

It would be the same if you took a modern day 302 or 5.0 and stuck a set of AFR 225's on it.

[blykins]

Yeah, I gotta relate to it in any way that I can....

[A98Coupe]

What happened to this engine build..................?

[lippy]

Still going fine...

[blykins]

Engine builds take a bit of time. We're making good progress, but we had to wait a little bit on pistons, little on the block, heads had to be sent out to be ported, etc.

I can post a picture of Jeff's Isky lifters if that would help.

[blykins]

Jeff's heads are nearly completed. My porter is finishing up the details on the heads and has turned to the intake manifold.

The heads were pretty rough out of the box, but we were able to get some really stout numbers out of them.

337/341/347 j@ .650"/.700"/.750"

That's a smokin head for an FE.

The exhaust side came in at 260 cfm with a 2" pipe. That's phenomenal compared to any other wedge FE head out there that I've seen.

Jeff's cam lift is going to be between .650-.700" after lash, so the numbers at that level will support a good bit of horsepower.

[blykins]

Final numbers...

Intake flow

.100 70.00
.200 147.56
.300 217.62
.400 280.22
.450 303.05
.500 319.98
.550 329.79
.600 332.46
.650 336.92
.700 341.37
.750 345.83

Exhaust

.100 52.00
.200 109.68
.300 166.84
.400 217.06
.450 230.02
.500 238.44
.550 242.88
.600 245.87/with 2" pipe 262.41
.650
.700
.750 245.87

Check out the low lift flow numbers....and then check out the peak exhaust flow.

Sweet heads....

[ERA Chas]

So 640 when all done?

[Dimis]

Originally Posted by ERA Chas

So 640 when all done?

Well done Chas.
You called it a long way out.

Good call lippy on all the choices for your build.
Looks to be a smashing motor for your cobra.

Best wishes.

[Cobrafan1]

What's the port volume on those heads?

[blykins]

I don't have them in hand yet so I haven't checked them personally. My head guy says they are very close to a stage 2 KC head or survival motorsports' new head.

[blykins]

They are 208cc.

[Dimis]

Originally Posted by blykins

They are 208cc.

Ahhh... What does that actually mean?
OR should I say how does that compare to.. Edels, BTs, MR etc.

Thanks for the education.

[fordracing65]

Originally Posted by blykins

I don't have them in hand yet so I haven't checked them personally. My head guy says they are very close to a stage 2 KC head or survival motorsports' new head.

Do you ever use there heads or do you always use a bare head and have your guy do the porting?

[blykins]

I buy bare heads and have them ported per application.