You most likely have GE30E heads which were 5.5:1 Compression. They were replaced by 10A4209 also 5.5:1. My UTS has one of each and runs fine.
The more desirable heads would be the GE30M or GE30Z or 10A4210 which were 6.95:1 Compression Ratio. If you are changing both heads, you might want to consider upgrading - just make sure you have the correct Head Bolts and Pushrods. The Head height for the GE30E was 5 inch but the GE30M and GE30Z were 4 17/32 inches.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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