Billet xtreme cylinder heads

[xbmwguy]

Selling my backup set of heads. Bill made these for me when I was roll racing a few years back when I was in Fla.

52.6 intake valves
41.5 exhaust valves

41 mm d shaped exhaust port
42.5 intake port

These are for 3.4 and are twin plugged and flame ringed

Pics when I get home I will be asking 12k local NC pickup preferred

[xbmwguy]

For those whom requested

[Axel84]

Porn

[gsxrken]

Originally Posted by Axel84

Porn

Exactly. I go online and see that. ^^
At home I see this:




All kidding aside, GLWS. I’m sure they’ll find a good home and I hope the builder posts the build thread here for us to covet our neighbor.

[Axel84]

Hahaha. Yeah same here. Its just that my bank manager doesnt agree with this purchase

[Time zone]

Do you have the intake/exhaust port flow numbers ?

[xbmwguy]

I do not. I know bill personally and his head work is the best in the business. Singer wouldn’t use him if he wasn’t . And I also don’t need to add great head work makes these motors

[Bucketlist]

These are a really nice set of heads and I think worth the price for someone building the ultimate turbo monster. You can't beat the decision to go with twin plug heads.

[krasuskyp]

Frank!

[xbmwguy]

PAULIE!!!! Wish you would do another NC palooza

[krasuskyp]

FRANKIE!

Jahmon... I'd done Targa Carolina down thar 1.5yrs ago and Blue Ridge Ruckus in Roanoke the year before... those add like 2200mi to odo per so they're few and far betwixt unfort 8/

Where in Cackalacky are ya these daze??

[xbmwguy]

Been up here in NC for 3 years now and love it.im in the foothills very close to where Pete had the palooza. Had to turn down the boost to mid 6s for the mountain twisties. She is still the bi#&c that tries to kill me when I get on her

[xbmwguy]

10500 pl shipping . New sxs arriving soon

[Tippy]

Originally Posted by Time zone

Do you have the intake/exhaust port flow numbers ?

Ditto, not that I’m a buyer, but super curious

[Jeff Alton]

Cast or Billet?

[xbmwguy]

Xtreme calls them billet but I believe they are cast. They are his top of the line heads

[TurboKraft]

The Xtreme heads are cast from the same RR350 alloy that Porsche uses for the Turbo, GT2, and RSR heads. It's the good stuff made to withstand sustained high temperatures.

They are then 5-axis CNC machined.
Optimized ports.
Oversize valves (typically 53mm/42.5mm)
Stronger guides.
AASCO springs & retainers.

Everything is the best, tried and true.
Superior to any 2-valve heads you could purchase from Porsche.
They are what we use on any serious build where we're after max power and durability.

Flow numbers:
This is an older chart from 2010, back when we first started working with Xtreme



I wouldn't be surprised if they're slightly improved since then -- Bill and his team aren't ones to sit on their hands.

FWIW: the asking price is approximately what the wholesale cost is for a set of heads these days -- and with no waiting.

[911TurboSlant]

Originally Posted by TurboKraft

The Xtreme heads are cast from the same RR350 alloy that Porsche uses for the Turbo, GT2, and RSR heads. It's the good stuff made to withstand sustained high temperatures.

They are then 5-axis CNC machined.
Optimized ports.
Oversize valves (typically 53mm/42.5mm)
Stronger guides.
AASCO springs & retainers.

Everything is the best, tried and true.
Superior to any 2-valve heads you could purchase from Porsche.
They are what we use on any serious build where we're after max power and durability.

Flow numbers:
This is an older chart from 2010, back when we first started working with Xtreme



I wouldn't be surprised if they're slightly improved since then -- Bill and his team aren't ones to sit on their hands.

FWIW: the asking price is approximately what the wholesale cost is for a set of heads these days -- and with no waiting.

Hey Chris, Brian Bearden here. You’re working on an EFI set up for my car up at Barnaba in Chicago. I’m interested in these heads and I am in contact with the seller. Matt at Barnaba wanted me to get the specs on these heads to see if they will work for what we are doing.

Thought I’d give you a heads up as he may be contacting you about these.

[TurboKraft]

Originally Posted by 911TurboSlant

Hey Chris, Brian Bearden here. You’re working on an EFI set up for my car up at Barnaba in Chicago. I’m interested in these heads and I am in contact with the seller. Matt at Barnaba wanted me to get the specs on these heads to see if they will work for what we are doing.

Thought I’d give you a heads up as he may be contacting you about these.

I think these would be excellent for you.
Let’s double check that these big intake valves will clear your pistons, that the valve reliefs are big enough.
I have notes on this at the shop.
If they aren’t, either the brake valves have to be swapped out, or the pistons machined for bigger pockets.

[911TurboSlant]

Originally Posted by TurboKraft

I think these would be excellent for you.
Let’s double check that these big intake valves will clear your pistons, that the valve reliefs are big enough.
I have notes on this at the shop.
If they aren’t, either the brake valves have to be swapped out, or the pistons machined for bigger pockets.

Perfect. Thanks for looking into it. I will let Matt know you’re on it.