11-09-2005, 11:14 AM
The temp gun will give a false reading only if the head is polished on the inside where the plug goes. The center part of the head where you check the temp at. If its polished or has really any type of shiny finish, it tends to make the reading reflect and bounce around not letting it zero in on a particular spot. If you ever want to use a polished head and want to get proper readings, you can always spray some paint in the center so the reflection is gone or reduced. In theory, a colored or ano'd head disapates heat a little better, The darker the better. This also goes for the black cases on some of the motors available. In reality, a real Machined head (like King Headz) cools the motor at a very high rate and much more effectivly than a cast head or stock head.(But thats another story) Sorry for all the info but im bored. Just polish the top fin and it will be just fine on your temp readings.
Also, I have seen some guys using a laser temp gun. These guns can be just as good as a high dollar gun like I have. In order to get a proper read you CANNOT get a good read from just pointing the laser at the head from a few inches away. The laser is just for pointing and not for reading, the temp reader is under the laser and that needs to be lined up and on top of the head at point blank range. Center the big hole on the gun with the plug, forget where the laser is, and this will give you a good reading. When you point the gun with the laser on the plug from a few inches over the head, you just temped the TOP of the head not the plug area. This gives you a false reading and shows a cooler temp. Over all, dont always tune your motor with a temp gun, you dont want to tune for temperature reading. Tune for performance with good smoke, its not uncommon to have a motor run perfect at 260. Hope this helps.
Also, I have seen some guys using a laser temp gun. These guns can be just as good as a high dollar gun like I have. In order to get a proper read you CANNOT get a good read from just pointing the laser at the head from a few inches away. The laser is just for pointing and not for reading, the temp reader is under the laser and that needs to be lined up and on top of the head at point blank range. Center the big hole on the gun with the plug, forget where the laser is, and this will give you a good reading. When you point the gun with the laser on the plug from a few inches over the head, you just temped the TOP of the head not the plug area. This gives you a false reading and shows a cooler temp. Over all, dont always tune your motor with a temp gun, you dont want to tune for temperature reading. Tune for performance with good smoke, its not uncommon to have a motor run perfect at 260. Hope this helps.
T-T-T 
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