Technical > Matt Shaff's Engine Shop

50mm roller cam bearings ?

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denverflatheader:
Anyone have recommendations on when to select 50mm roller cam bearings versus stock sbc cam bearings?  Have been collecting parts the past year to build a Kinsler injected sbc with symmetrical port Dart/Buick 10 degree heads.

Cam specs are:
General Kinetics "Special CR-308/312-10R:  309/313 @.018" - 272/276 @.050" - .188/190 @.200" - 420"/.420" cam lobe lift - 110 Separation; 108 Intake lobe center-line.

Just bought this 50mm roller cam bearing camshaft.  50mm roller bearings I.D. are 1.875, stock sbc cam bearings I.D. are 1.868.  My aluminum sbc is setup with stock cam bearings.

Wondering which is better route, grind 50mm roller cam journals down to fit stock sbc cam bearings, or modify stock block cam placement to install 50mm roller bearing, or other ideas.  Alan

p.s.  All aluminum engine will replace stocker in my old stingray which hasn’t moved in 30 plus years.  Be a street/track car may see 7-8000 rpms.

dreracecar:
If you are haveing bottom oil issues you can direct more oil to that area because the rollers live on splash.
Rollers walk around in the bores and have to be pinned in place, New Sprint car blocks have holes machined in the valley to do this , older blocks have set screws tapped into the cam bores both side of the bearings.
 For the 7 seconds we run, I dont see the need/results that warrant the expense

denverflatheader:
dreracecar - appreciate comment.  Not expecting bottom end oil issues.  Alan 

dusterdave173:
Check to see --if you grind down journals will lobes pass through std bearing diameter--some will some will NOT--I would go std bearing if possible to save that $loot   cheap to have crank grinder do the cam

denverflatheader:
dusterdave173 - thanks for likely conflict to check.  Should have cam within 2 weeks, will verify if it’s a clash to install.  Alan

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