Thread: Amazon: - Cylinder head
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Old Nov 8th, 2019, 13:23   #5
Derek UK
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Washers under the bolt heads aren't standard. Not in the parts list. If they are used they should be hardened steel. If converting from bolts to studs, studs often used on competition engines, hardened washers are used under the nuts.
Before fitting the head run each bolt fully down into the block. They should all go down very closely to the same amount and obviously far enough to enable them to take the standard torque with a bit of room to spare. All bolts are the same length. If rust or dirt builds up in the bottom of the hole it can happen that a bolt will appear to be at proper torque but not actually down far enough to clamp the head, So, if you find a bolt that is higher than the others when screwed in you will have to see what is causing that.

Did you do you compression test with the carbs fully open? Sometimes omitted when you are by yourself. It then doesn't get enough air in to compress. That can make a lot of difference. Maybe the low 125 pounds is because of this but the engine will go for thousands more miles even at that figure. It's very rare for each cylinder to be exactly the same, as yours were, up to 10% difference is acceptable.
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