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Author Topic:   heads
posted July 13, 2003 08:41 PM
has any one heard or tried the 50cc pro lightening heads from down under, that are sold by speedway catalog.

posted July 14, 2003 03:52 AM
here in oz, plenty of people are running the pro heads. both aluminium (sprintcar & latemodel) and iron lightening (limited sprintcars). I am led to believe that they are the best flowing heads currently available for the SBC. I think Ron Shaver is also using them on his current WoO engines.
I personnally have not tried them.

posted July 14, 2003 09:10 PM
We saw a set of these - brand spankin new - in the machine shop a few weeks ago. I looked them over extensively. They were the cast iron 50cc type - sweet!!!!. Why in the **** I keep spending money and tons of my time on these humpies compared to the Pro heads is beyond me. good looking intake runners and the deck is so think - they can be shaved several times. I think they are a good bang for the buck.

posted July 14, 2003 09:47 PM
I spoke with my machine shop guy about them and he said he has had alot of problems with pro topline heads not being finished. Spark plug holes not threaded etc etc. Just make sure everything is done on them. I was going to run them but have decided to go with the Dart 49cc heads. I believe he said they were behind on their orders also, so I wouldnt be able to get their 50cc heads at that time.

Smith Racing Team

posted July 15, 2003 10:25 AM
When you get the dart heads look them over real good. The area that the intake push rod goes down to the lifter is real tight. When you bolt the guide plates on try to put a push rod in the hole. It will not line up with the lifter. I had to grind out the area for clearance. I thought I had ground enough. Ran the engine a few times sound ok. Ran it on the track and once it got heated up the clearances weren’t enough. Exploded 3 lifters. The push rods hit the little clip that holds the lifter together. I removed the heads and really grinded a lot of material on the intake runner.
I called dart and they were no help. Said it was my block; the lifter bores on block they have, have been out .100. I must have ground out .200. The stock heads had no problems. Good Luck

posted July 15, 2003 04:31 PM
I've been awefully curious as to how the Pro Topline compares to the Darts or World Products. If anyone has "first hand" experience with these cylinder heads, please be kind enough to share.

posted July 21, 2003 05:14 PM
Scoot, have you rec'd the Dart's and how are they? I'm looking for some recommendations. Thanks.

posted July 22, 2003 04:10 PM
I ordered a set of the new 230 Iron eagles when they first came out and after looking them over real good one of the castings didnt have any spark plug holes in it and they wouldnt send me another one I had to send that one back they machined the plug holes and sent it back to me two weeks later man was I pi$$ed....I put them on a dome 406 in a drag car that was a sweet set of heads.....Towman

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