Visit The Dirt Forum for More Information

Author Topic:   heads??
36k
Member
posted February 25, 2002 06:16 PM
In my opinion, if you are going to change the heads, go with the iron eagles, just for the fact that if you have to go and get the other heads built, with ***** -in studs, and all the works, you will probally pay the same money, if not more for the stock heads than you would with the darts. also, with the dart heads, i have noticed that they have alot more meat on them, so you could go off and have alot angle milled off of them to raise more comp. One more small tidbit; if you do decide to go with the dart heads, either run head studs, or arp head bolts as they are a little longer than the stock GM bolts. We found this out the hard way and pulled the threads out of one of the holes.


36k
Member
posted February 26, 2002 04:06 PM
I will tell you what I have found flow testing the heads in question, but understand my data from the 492 heads is based on a very small sample size(1 set). I also don't like to mention specific flow numbers because most people test in different ways, and its like comparing apples and oranges, and leads to ****ing contests. I did not measure the port volume of the 492 heads, but Chevy literature says 157cc. I found they flow about 15-20% less than out of the box darts, and this margin follows right along as the same amount of labor is put into each set of heads. Its not quite that the other heads start where the 492s end, but close. The 492 was a very good head(In its time,1972?), before Bow Ties, Darts, Pro Action, etc, but imho, the competition scene has passed them by, unless you HAVE to run them. I would agree with DodgeBoy in the Dart Iron Eagles are the best choice of the 3 you mentioned, and would choose them over the World Sportsman heads because of the replaceable bronze guides.


dirttrackracer
Member
posted February 28, 2002 09:44 PM
One thing to add,remember you are talking about heads that are thirty years old,it is hard to find good heads that are that old that are not cracked, or on the verge of cracking if they aren't already.I would never justify putting that kind of money in a head that at it's best will not be as good as an out of the box head.


36k
Member
posted March 01, 2002 06:13 PM
We are running the 215cc runners,and 64cc chambers on our mod. our motor is a 350 with about 12.5-1 comp. We have had no problems with the heads, and have actually blown a head gasket,and it took a chunk of the head with it, sent it to the machine shop and had it welded back up, and it is still ont he motor today. Just keep in mind what my earlier post said...be sure to run some ARP head bolts or studs to keep from pulling the threads out of the block. It will cost a little more now, but will surely save you in the long run!


Back to the Archives