Dart Pro 1 heads arrived.

Hemmie,

You can get whatever springs you want, but the heads set up with roller springs are a bit more expensive. The heads I got are #110 on the seat. The guy I got them from recommends them for .525 lift, but he said that is just to be on the safe side and they will handle .550 without issues.

Like I said, I will check them over before installing them.

Here is a link to the heads he is selling, but he has raised the price $25 since I ordered mine.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7942294678&category=33617

Chris

Edit:

I just got an email back from another guy who bought the heads from Yoder. He said he had no problems and they made 550HP on a 390ish cid small block and ran them this whole season on a drag car without issue.

Tom, chris-

I think clarification is needed here. I bought my iron eagles the same way chris did and just bolted them right on. I found the machine work to be way above and beyond what I expected. Here's the difference. Tom, the problems you've had are probably people who buy the "fully assembled" heads from dart or other warehouses, am I wrong? The difference is, the people who chris and I bought our heads from independent machine shops (much like yours, tom) who sell these heads on ebay for a reduced rate, because they buy pallets of bare casting heads and then do all the machine work in-house. The 200cc runner, fully assembled angle plug, 2.05 heads like I got are something like just shy of 1000 dollars in summit. I got them for 700. (maybe its 900 in summit, dunno).

They guy who did my heads put in manley valves, threw in a set of com cams guide plates and actually (get this) UNSHROWDED MY EXHAUST VALVES!!!! Can you believe it?!

Some of these guys really know what it means to be cool with your customers and go the extra step for a quality product. As soon as I saw the work I was so confident I just tossed them right on the motor, and I was right, everything was in order.

K

This is from an earlier post of mine:

The worst aftermarket heads i have seen were a set af Canfield sbc heads. The chambers were 3ccs oversize, the heads were warped .013", and the valves seated so badly light shined into the chamber was visible in the ports. Shortly after those heads I worked on a pair of bbc race heads. These heads were each warped over .014". I have also fixed Dart, AFR, World Products, Brodix, and Ford Motorsports heads. The defects i found were: guides too tight, valve guides not concentric to the seats, valve seats too wide, too narrow, and damaged by chipped cutter blades, seats contacting the valve face too far off the inside or outside, broken keepers, lubricant not present on valve stems, and more. My point is that ALL of these problems somehow got past quality control checks and made it into consumer hands.

The thing is this: Any of these heads would probably made decent power in spite of the problems because of the fact they are horsepower producing heads. A rough idle caused by leaky valve wouldn't be that noticable with a radical cam. But eventually a valve would stick or eventually burn or a head gasket would leak. I have seen each of these happen on heads that were bolted on. One head in particular was a bbc Dart head. The source where the head was bought from was advised that the valve seats didn't look right. The buyer was told to use them anyway. After little use on the drag strip, a valve head broke off from flexing as it tried to seat on an off-center seat. All I am saying is that if you spend $1500-$2000 or more on a set of heads, it would be wise to have them checked out by a good machinist. We do that for our
customers (while they watch) and they are more than happy to see that we found a problem before it cost them a lot more money in the long run.


After your previous experience, I'm sure you would rather check things our first............



tom