![]() ![]() ![]() That means you'll never be able to get things tightened up right. It's easier to make the holes a little bigger each time than to try to make a too-big hole smaller, if you get my drift.Īfter the holes are the right size and you are trying to install the bolts, you will find that the surface the bolt is supposed to tighten against is at the wrong angle. It took me several tries to get the holes the proper size. Using a rotary file, carefully elongate the holes to allow clearance for the bolts to enter the heads at the right angle. They are at the wrong angle to be able accommodate the hold-down bolts. Here you can see the holes that need to be modified. So, on the TBI manifold those 4 center bolt holes are at the wrong angle to be able to bolt it down the heads. This allows you to actually get a wrench on them and tighten them properly. When using a stock throttle body fuel injection manifold on the older small-block Chevies, you have to keep in mind that in 19? GM modified the heads so that the center 4 manifold bolts are more upright instead of as the same angle as the other 8. TBI Intake Manifold Using a stock TBI Intake Manifold ![]()
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