head question, need opinions Options

[rcrgrl]

so, finally going to do something with my 2.0 heads. getting new valve seats, probably new valves, and welding those wonderful cracks at each spark plug hole.
but now am having second thoughts, perhaps i should have just gotten new aftermarket ones - they were from brazil or some place?

what'd you guys think - did i do the right thing keeping the original ones?

[Jake Raby]

I'll pop in for a minute here as there is some misinformation that needs to be cleared up- then it's time to go back behind the curtain..

They do not have the right spark plug angle, they do not have the right number of intake studs, the chamber shape is different, as are the ports.

Really?? These pics and plots say everything.

(IMG:http://www.aircooledtechnology.com/galleries/cncheads/CNC%20heads%20033.jpg)

(IMG:http://www.aircooledtechnology.com/galleries/cncheads/CNC%20heads%20001.jpg)

(IMG:http://www.aircooledtechnology.com/le180_914stockvsported.jpg)

The Raby heads (which I don't think are availble separately yet?) may be better in many ways.

Better in every way, rebuilding a 30+ year old head will never give the results we see with these new castings with their CNC ports and chambers that were digitized from authentic 2.0 Porsche heads.

They have been available since May and many sets have been delivered, Rhodyguy has a set. We try to keep them on the shelf, but it's very hard..

The chambers are much stronger than a stock 2.0 as they feature standard 12mm plugs with copper clad steel inserts. plug location is exacting that of a 2.0 and a 3 stud intake is nothing but an option.

But they still aren't 2.0 heads.

Unless a part number in the valve cover area means anything to you the differences would never be known from a 100% authentic head... we worked very hard to replicate the stock head right down to the port flow and chamber volume..

Dave needs to do his required reading a little more often as he is behind times!!! LOL

Read more about them here
LE 180 head information and prices


The Web 73 won't provide power over 4K RPM, even with 12:1 and the most optimum combo on the planet to compliment it! It's designed as a VW BUS cam that just happens to work wel with stock EFI..

The huge 48mm valve just ups the flow below .150 lift and is virtually worthless after that as it actually impeded the flow around it's cone! We finally were able to create a port that would sustain the flow of a 48mm valve efficently, and this is it
(IMG:http://www.aircooledtechnology.com/galleries/msheads/slides/Arnett%20manx%20052.jpg)

The stock, unwelded port is maxxed out at 44mm intakes. The shape of the port and it's wall modification at certain portions of the port are the key, not the size.... Until the head is welded these portions of the port cannot be modified due to wall thickness. You can't tell it by looking, but the stock 2.0 port has two different twists that are very clearly noted when a silicone pour of the port is made. Until this twist is removed turbulance that heavily effects the mixture motion and flow of the charge is present and can't be improved upon...

We now make 185HP and 187 lb/ft of torque from a 2270 with a 44mm intake and off the shelf LE 200 heads with no trick parts at all...

This is a touchy subject and it was filled with "Bigger is better" thoughts, so it demanded some intervention from me. I am not back and will hardly ever make a post until something this critical pops up, so don't get your hopes up!

[Dave_Darling]

They do not have the right spark plug angle, they do not have the right number of intake studs, the chamber shape is different, as are the ports.

Really?? These pics and plots say everything.

And those are unmodified AMC heads? AMCs were the ones I was referring to.

But they still aren't 2.0 heads.

Unless a part number in the valve cover area means anything to you the differences would never be known from a 100% authentic head... we worked very hard to replicate the stock head right down to the port flow and chamber volume..

Interesting--I thought that your new heads were a different design, not simply a replication (with improvements) of the 914 2.0 head! And I didn't realize they were avilable separately from a full engine at this point. Thanks for clearing that up!

--DD