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This is one of MANY of the sets of heads through the years of doing heads. I cannot tell you enough that you DON’T bolt on a new set of heads that are out of the box that the company claims “ready to bolt on”!!! I know that many of you out there are going to say “that is ridicules, why would I buy a new set of heads to take to a machine shop to have them tore back down and possibly a valve job and guide work done? The reason is simple and can be explained in TWO WORDS….MASS PRODUCTION!!! All of the companies are guilty from AFR to World Products and all the letters in-between (Brodix, Dart, Indy, Trick Flow, GM) I have seen the following during the course of my 24 years of doing these things, and are as follows:
1. Seen daylight through the valves using a flashlight at the entrance of the port pointing to the valve seat
2. Seen the heads WARPED as much as .015 on the deck surface requiring the heads to be surfaced (GM was real bad about this with the Vortec 906 and 062 heads)
3. Uneven Valve guide clearances, of inconsistent measurements of Taper from top to bottom of the valve guides. This can cause Valves to stick, or to Smoke excessively. Remember, the life of the Valve Job is the straightness and Taper of the valve guide!
4. THE VALVE JOB IS 85% OF THE TIME “OUT OF ROUND” AND OUT OF CONCENTRIC AS MUCH AS .006, CAUSING LEAKAGE AND BACKDRAFT PRESSURES RESULTING IN MAJOR HORSEPOWER LOSSES!!!!
These are just a FEW of the major reasons to have the heads ordered BARE, order the parts on your own to assure you don’t get CHINA VALVES, along with CHINA SPRINGS, CHINA Guides and Studs!!! Remember, if the difference between an assembled set and bare set is just $150.00 to $200.00 then you got China parts all through the head (I have actually seen China writing on guide plates and marks of China on Studs and Valves……. This is part 1 of “WHY you don’t put new heads on your engine without first going through the heads by taking them to a well versed and good reputable shop before putting them on your engine.
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