B-head weakness?

[Miked232]

Looks like I’ve gotta pull my heads. Wasn’t planning on doing this yet but oh well! I was looking at MMR’s rebuild kit. Any suggestions / recommendations while I have the heads off? Valve? Porting?


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[Blown_By_You]

Ports are already too big. Valves are good from the factory unless you're spinning 8k.

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[chao5.0]

Big lazy ports, will move a lot of air but they suck for N/A on these small cid engines unless you plan on turning a lot of rpm. Now with boost well they are on par with the other heads.


If you do keep the B heads just have a valve job done, blend the valve job and open the venturi up to 90% dia of the intake valves. On the exhaust side blend the valve job again.

 

[scottydsntknow]

We don't mention the 3 letter company from California... :goes and gets spray bottle:

To answer your question, seals, guides and lap the valves. That's it.

Now would be a good time to convert to C heads and degree/advance your cams...

 

[Miked232]

We don't mention the 3 letter company from California... :goes and gets spray bottle:

To answer your question, seals, guides and lap the valves. That's it.

Now would be a good time to convert to C heads and degree/advance your cams...

LOL any recommendations on companies then?


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[Miked232]

Big lazy ports, will move a lot of air but they suck for N/A on these small cid engines unless you plan on turning a lot of rpm. Now with boost well they are on par with the other heads.


If you do keep the B heads just have a valve job done, blend the valve job and open the venturi up to 90% dia of the intake valves. On the exhaust side blend the valve job again.

I’m running a Kenne Bell @ 8psi That’s how I found out I need I rebuild the heads lol. My good friend is also a Mechanic / machinist for a BMW race team. So he’s doing all the work.


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[scottydsntknow]

Well if you already have that blower that means you need to stick with the B heads... and be stuck sans intercooler... Just get a basic rebuild done and bolt them back on. Not much of anything you can do to the B heads and thats because you don't need to.

 

[Miked232]

Well if you already have that blower that means you need to stick with the B heads... and be stuck sans intercooler... Just get a basic rebuild done and bolt them back on. Not much of anything you can do to the B heads and thats because you don't need to.

Okay cool. My goals are only like 500ish. I’m in school for mechanics. My Instructor actually gave me the ok to rebuild my heads at the school if I want to. So this is helpful lol

Btw. My friend is already working on a setup for me involving a Lightning aftercooler and custom heat exchanger.


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[chao5.0]

Well if you already have that blower that means you need to stick with the B heads... and be stuck sans intercooler... Just get a basic rebuild done and bolt them back on. Not much of anything you can do to the B heads and thats because you don't need to.

There is a few things you can do to them to help them, fixing the horrible machining job from the factory will go a long way. I did basic things to my original B heads and it was flowing 280 @ .400 and 300 @ .500, ports remained untouched.

 

[scottydsntknow]

True... I mean basic cleaning and valvejob.

Still love how you can't give the damn things away. I had 3 sets I scrapped before I moved because nobody wanted them. And they work so well if you set them up right

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[98 svt]

True... I mean basic cleaning and valvejob.

Still love how you can't give the damn things away. I had 3 sets I scrapped before I moved because nobody wanted them. And they work so well if you set them up right

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I just scored a frehly rebuilt pair of B heads, shipped to my door, for $350

 

[scottydsntknow]

As long as they were done right that is damn good.

 

[Miked232]

I just scored a frehly rebuilt pair of B heads, shipped to my door, for $350

How? Where? Lol


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[98 svt]

How? Where? Lol


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LOL eBay, believe it or not. Fresh rebuild, 3 angle valve job etc.
I figured they came from a SVTP member
Ford 4.6L / 5.4L DOHC 4V Stainless Steel Intake & Exhaust Valves SVT COBRA MACH | eBay

 

[scottydsntknow]

From MHS? That's a great deal then! Fully gone through revised heads are 3x that much. I wonder if they ever have cheap 99/01 style heads...

 

[98 svt]

From MHS? That's a great deal then! Fully gone through revised heads are 3x that much. I wonder if they ever have cheap 99/01 style heads...

MHS? What gave you the idea they came from MHS?

 

[96GT226410]

LOL eBay, believe it or not. Fresh rebuild, 3 angle valve job etc.
I figured they came from a SVTP member
Ford 4.6L / 5.4L DOHC 4V Stainless Steel Intake & Exhaust Valves SVT COBRA MACH | eBay

Damn good deal!

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[98 svt]

Damn good deal!

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Haha right? He wanted $450 shipped, but the auction said to "make an offer, worst I will say is no".
$350 shipped was a hell of a deal. They had to have cost $100 to ship.
My builder told me my heads were bad, so I started looking. Took me about an hour.

 

[brucesvt]

Haha right? He wanted $450 shipped, but the auction said to "make an offer, worst I will say is no".
$350 shipped was a hell of a deal. They had to have cost $100 to ship.
My builder told me my heads were bad, so I started looking. Took me about an hour.

Damn that’s a hell of a deal

Good luck with the build


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