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Old 05-28-2012, 08:06 PM
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Sloppy Threads on Aluminum Heads

Is there a way of taking the looseness out of threads for the intake bolts on aluminum heads?(on the motor in the car) Also where to purchase a thread chaser?

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Old 05-28-2012, 08:51 PM
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no aluminum threads

they thread a steel insert into the head and you run your bolts in and out of the insert. just install new inserts. they are similar to a helicoil
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Old 05-29-2012, 01:04 PM
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You can try using a class 3 tap and bolt , they have very tight spec's and are used on aircraft or anything of good quality. Just the Tap with a regular bolt tighten things up. I usually run a class 3 taps when preparring a block to assemble. We use them on our nitro motor's to keeps things held tightly together.

info on taps:
There are three established Classes of Thread, designated in the Unified series by adding A for screws and B for nuts (or other internal threads) to show definite limits and tolerances.

Class lB Thread is that in which a 1 A screw can be run in readily for quick and easy assembly. The hole is classified as 1 B. The fit is 1 B Thread, and rarely used in modern metalworking.

Class 2B Thread consists of a 2A screw in a 2B hole. This 2B Thread has wide application, accommodates plating, finishes, and coating to a limited extent and, therefore, has fair tolerance allowances.

Class 3B Thread means a 3A Screw in a 3B Nut or threaded hole for applications where tolerance limits are close.
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