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Fit the them...They are there to reduce the temperature in the head from reaching the valve springs damaging and weakening them. Only an idiot such as the brain deads who came up with the Combat lumps left them out and that was probably because of the higher lift cams they employed which compressed the springs further so to ensure the springs did not become compressed into the coil bound state at full lift, which would very quickly kill the cam lobes, they left the heat washers out. It is known in Engineering as BODGING the job..... Personally I had different thickness heat washers and with the standard type lift cams and genuine Norton valve springs fitted them so that at full lift on the cam the springs still compressed 0.090-0.100 inch before becoming coil baund. I set them up thus on our short stroke 500 and it revved to 8,000 without the valves hitting the pistons etc!

<blockquote data-quote="J. M. Leadbeater" data-source="post: 328325" data-attributes="member: 7682"><p>Fit the them...They are there to reduce the temperature in the head from reaching the valve springs damaging and weakening them. Only an idiot such as the brain deads who came up with the Combat lumps left them out and that was probably because of the higher lift cams they employed which compressed the springs further so to ensure the springs did not become compressed into the coil bound state at full lift, which would very quickly kill the cam lobes, they left the heat washers out. It is known in Engineering as BODGING the job.....&nbsp; Personally I had different thickness heat washers and with the standard type lift cams and genuine Norton valve springs fitted them so that at full lift on the cam the springs still compressed 0.090-0.100 inch before becoming coil baund. I set them up thus on our short stroke 500 and it revved to 8,000 without the valves hitting the pistons etc!</p></blockquote><p></p>

[QUOTE="J. M. Leadbeater, post: 328325, member: 7682"] Fit the them...They are there to reduce the temperature in the head from reaching the valve springs damaging and weakening them. Only an idiot such as the brain deads who came up with the Combat lumps left them out and that was probably because of the higher lift cams they employed which compressed the springs further so to ensure the springs did not become compressed into the coil bound state at full lift, which would very quickly kill the cam lobes, they left the heat washers out. It is known in Engineering as BODGING the job..... Personally I had different thickness heat washers and with the standard type lift cams and genuine Norton valve springs fitted them so that at full lift on the cam the springs still compressed 0.090-0.100 inch before becoming coil baund. I set them up thus on our short stroke 500 and it revved to 8,000 without the valves hitting the pistons etc! [/QUOTE]

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