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- Pro Topline heads can have the following problems12:
- If the heads are too big, the airspeed is too slow, and fuel droplets have a hard time staying in suspension.
- If the heads are too small, the airspeed is too high, and the fuel droplets can get pulled out of suspension.
- The heads are thicker than most on the market by 1/8 inch, so you may need to modify your brackets if you use them on a street car.
- The valve guides may come tight and need to be checked.
- Push rods on the intake side may hit the heads, so you need to grind some clearance or use .150 offset rockers and plates.
- You also have to use ARP head bolts as a stock head bolts are not long enough for the proper 1/2 inch thread engagement.
- There may be a difference in stem heights between heads.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Too big and the airspeed is too slow. Fuel droplets have a hard time staying in suspension, booster signal is weak, etc. Too small and the airspeed is too high. In certain areas it can become "Sonic" and/or turbulent and the fuel droplets can literally get pulled OUT of suspension.....and the engine starves for air.
www.stevesnovasite.com/threads/pro-topline-head…Here is some of the things i can tell you about the heads 200cc up you have to use a victor jr intake or one like it 180cc and smaller heads you can use a dual plain The heads are thicker then most on the market by 1/8 inch.125 thousands so if you use them on a street car you will need to modify your brackets.The valve guides come tight some times and need to be checked push rods on the intake side only most of the time hit the...
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