Wednesday, June 9, 2010

DG Performance Heads

A few posts ago I talked about a custom RD350 cafe racer called "Project Goldhead" due to the rare (and ultra-slick) gold DG cylinder heads. Very sharp.

Then a gentleman named Domenic wrote in to ask some questions, since he was listing an engine with these heads on Ebay and thought I would have some information on them.

I must admit I didn't know a whole lot about these heads other than that they are very trick, very rare, haven't been made since the 1970's, and when they come up for auction they command a pretty good price. From what I could gather online, the heads are domed, which raises the baseline compression ratio, which in turn yields greater overall power and throttle response. Plus their oversized radial cooling fins and gold tone are pretty slick-looking.

If you take a look at the hot rod scene, any sort of original and period-correct non-reproduction speed parts are desirable, and the rarer the better. So naturally it makes sense that the same scenario would exist for period performance parts for the R5s and RDs.

You can contact DG Performance in Anaheim, California at (866) 653-1647 or (714) 577-7499 for more information. Unfortunately, their website ( seems to be geared more towards modern dirtbike and ATV stuff these days - nothing vintage.

Here are a couple of current Ebay auctions for these heads:
- RD 350 YAMAHA ENGINE Complete 1971 R5 B (Domenic's listing)

Would love to snatch up Domenic's spare engine with the heads, especially at that price. Unfortunately I don't have the extra scratch, so I'm passing both of these opportunities on to you guys!


  1. Hi,neat stuff that you have put up bro - very informative. i am in the process of putting together an RD350 and was wondering if you could help me source a set of DG performace heads for the aircooled engine. i checked out the links that you had posted up - but the bidding had closed! any help would be appreciated.

  2. Go to

    There is a bunch of stuff for sale through that site all the time. If there aren't any DG heads, post something and someone will definitely reply and steer you in the right direction.