Twin Plug machining - who did you guys use?
 

Twin Plug machining for your heads & valve covers- who did you guys use and what ball park should I expect the cost to be?
Thanks in advance for any advice!
dt

Im going to use Verdan Machine in Dover, NJ. They did all of my refurbishing and Ive seen their twin plug jobs- very nice.

EBS did mine. They machine it for a smaller plug to save material (or so they say). I want to say it was about $500.

Performance Developments

I use the fellow local to me who does all my heads. Fantastic work, great prices. The dealer and all the independants use him. Haywardperformance.com


Cheers

cgarr on this board. he is in MI as uses 12mm to save material as well. can't remember cost but very very inexpensive. PM him for a quote

my heads being done in Neil's shop:
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+2 for cgarr (Craig and Denny Garrett) in MI.

The actual cost for the twin-plug machine work is not very expensive in the big picture; it's the cost(s) of how you fire the second set of plugs that gets expensive...

What did you mean by that?

Just having the heads drilled for an extra set of spark plugs does not, in and of itself, create a fully functioning twin-plug engine. Obviously the stock ignition system will only fire six spark plugs...so one needs to determine what ignition system will be utilized to fire all twelve spark plugs. It can get expensive - money being a relative term.

My latest project involving ignition:
JB Racing 12 point ignition distributor: $1,500
JB Racing spark plug wires (don't forget you need 12): $380
MSD 6AL CDI boxes: 2 @ $220 = $440
MSD Blaster SS coils: 2 @$43 = $86

All of this is in addition to the money spent on the machine work...

Gotcha..

Sandman, what's the cost of a replacement cap/rotor for the JB Racing distributor?

Just wondering if the Burnbros E-type cap/rotor conversion for the stock dizzy would be more cost-effective...

The replacement rotor is $70.50 and the cap is $127.50.

I just asked JB Racing today, how long they thought these parts would last, and Mike Bruns indicated they're on their third season (race car) without needing a replacement. He seemed to think it would be a long while in my daily driver before I needed replacement parts. According to Mike, it's usually the rotor that gets fried if a customer wires the dizzy wrong or if a wire comes loose from the cap and starts arcing.

Even with the Burn Brothers option, I still think the stock dizzy needs to be modified and re-curved. From what I recall, Henry Schmidt of Supertec Performance handles this and it's about $1,250 (working from memory as it was a couple of years ago), and I think you provide your dizzy as the core.

not anymore they made a complete casting now. but not sure on price

Good to know, Ben! Thanks for the correction!!!

Sand_man,
what made you choose a distributor ignition vs. distributorless?

I use Bill at Xtreme Cylinder heads. He is about as good as it gets in the Porsche world. He does my modular heads on my twin turbo cobra as well. His work in on another level, and his pricing is not that bad either. I run the Jb racing 12 plug distributor with two msd digital 6 ignitions, and two HVC coils. I would say I have about 3K in my ignition alone. My JB cap has a button on one of the spark plug terminals that keeps falling out. Not sure how long they will last on a car that has the plug wires taken off that often. Maybe I got a lemon cap.