Hybrid Heads L5/L7 from Aircooled.net ???

[Motox166]

Well, my used used heads were different than I thought I was getting. I don't think th PO knew what he had. He sold them as a standard L5.

Specs that I have verified:
94mm bore
40x35 valves = L5
76 or 77cc intake runners = L7
64cc chambers
Aircooled.net CNC'd in large print on the bottom fin.
049 castings

Ports have not been touched since CNC'd from the looks of it.

Was this a mistake somehow that got out the door? Did someone install smaller valves after new?
Is this some secret racers trick: venturi effect with the medium size ports tapering down towards the smallish 40mm valve.
I'm told by the PO that these are circa 2014.

Should I go bigger valves to match the runners?
If so what size? Having a local a vw machinist do the work, so is it worth the cost over buying new Panchitos for $600-700 or BTW, paid $400.

Building a:
2165
86c w/ 1.4s - thinking 106 LC?
10:1
Dual 44s
1 5/8 exhaust or 1 3/4?
7500 or 8000 max rpm
Vw650 springs, Ti retainers
As41 mag with bushed lifter bores, full flow
Bugpack crank, pauter rods

Shooting for 180hp+ at the crank

Use:
70 Baja Bug, mostly a fun after work/ weekend warrior.
Once in a while, play around in the Oregon sand dunes.
002 bus box, 30"x 13" sand paddles for sand drag racing and 32" for the street.

P.S. I posted this on theS*mba also. But I like the the answers I get here better.

Btw: Jim Ratto is my spirit animal. I like the way thinks!

[Erlend / bug66]

The cam and rockers (0n 108LC at least) is good for that RMP. Not too sure about the carbs and heads. If the heads were from JPM, I would not question it..

Change them out with 044 mini or regular wedge ports. GREAT head for the combo. My 2110 on old style wedge ports, 86C + 1,4 and 1 3/4 exhaust turned 200 hp at those RPMs. But on IDAs.. 

[Motox166]

The cam and rockers (0n 108LC at least) is good for that RMP. Not too sure about the carbs and heads. If the heads were from JPM, I would not question it..

Change them out with 044 mini or regular wedge ports. GREAT head for the combo. My 2110 on old style wedge ports, 86C + 1,4 and 1 3/4 exhaust turned 200 hp at those RPMs. But on IDAs.. 

Yes, that does sound like a good idea. What compression are you at?
Can you describe your power band? What rpm does it start pulling hard? 3500?

John @ aircooled.net said about the L5 heads:
"A test 2.0L engine with these heads made 186 HP with Dual 44 Webers. Web 86C and 10:1 compression. Cam pulls to 7500, but I recommend shifting at 7k"

[Motox166]

Pics:
https://www.thesamba.com/vw/forum/viewtopic.php?t=708848