I am converting to a High Butterfly system for lauri's car and have CIS heads. the MFI attaches directly to the head, unlike the CIS that attaches to the intake, with a slot in the heads.

does anyone know more about this and who can do the machining?

or does anyone have the info and i can get it machined locally?

thanks

andy

 

Hi Andy:

Are you using the 2.8 RSR tall buterfly intake setup?

Your heads can be machined to accept that intake system but the heads should be flowed to match, not simply hogged out,....

We've done quite a number over the past 25+ years.

 

As if Lauri isn't fast enough already!
-Chris

 

Steve;

Thanks. I am doing this conversion with P Faill and Matt Blast from Eurometrics (for those who don't know, Matt is a rebuilder/machinist of Weber and High B-fly stuff only) and they have Lauri's heads. My understanding is that we are keeping the stock valve sizes, but when all is done, they shoud flow at 250cfm (what do they flow stock??). Since these guys don't do the head machining themselves, they have someone else do the valves and flowbench. I am being told that this head guy has not done the conversion from cis to mfi so that is my search. any thoughts?

On another note, i am still sitting on Lauri's R brake calipers (as we planned to tear the car down for this conversion, it tuned into our winter project. I'll get them out to you this week.

I'm happy to send the heads to you for final fit and B-fly machining. could you give me details?



andy

 

Chris;

I know she is fast now, with a slow. tired car. Can't wait for her to try to spank my a$$ when this car is done

a

 

Steve;

sorry didn't answer your question. Yes we are doing the high butterfly set up. Matt and Peter have a few sets of them that are new

andy

 

Hi Andy:

For CIS heads, the injector reliefs are welded up and the ports would be opened up to match the throttle stacks. Following that, the injector holes would be machined.

Then, its flow bench time followed by a full valve job with our P-B guides, viton seals, and the valve springs and retainers of choice. We use the Aase racing springs and our own Ti retainers.

All heads are resurfaced and the seats are done with a 3-angle job using carbide tooling. Valves are measured and replaced as necessary. The P-B guides are hand-honed to fit, never reamed.

After assembly, each head is gas tested.

We can also machine the lower plug holes for twin-ignition if you like,....