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Old 01-13-2018, 12:46 AM   #41
Tom Wesenberg
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Default Re: Diamond Block Questions

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Originally Posted by mike657894 View Post
I have a diamond on my block and no serial ill have to check my casting number. i had noticed a couple hardened seats but it didnt look like all were hardened but i may need to look closer. And how different is this B cam. my cam has very pointy lobes with no duration.
Model A and B cams are both very pointy, unlike most of todays cams. It's a good thing the springs aren't as strong as what's used on most of todays engines, or those cam points would wear away very quickly. Give me back my zinc in the oil.
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Old 01-13-2018, 10:02 AM   #42
Railcarmover
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Default Re: Diamond Block Questions

I would say you can tell by the fuel pump cam lobe and the maximum lift.The lobe if you have it is a dead give away.I have a B cam that appears to be unground yet only has a max lift of .270,yet all I can find on B cams puts the max at over .300..
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Old 01-13-2018, 04:49 PM   #43
mike657894
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Default Re: Diamond Block Questions

I looked at mine and it has the b cam with .315 of lift. It measured .895 and 1.210 I did that quick with a dial caliper so may not be accurate. It has hardened exhaust seats and I tried to do some rubbings of the casting marks and I think I see F1210 or FA210





looking at the picture. under flash it looks more like FA210. The F is the lightest letter and may just be a interesting rust formation.
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