what is correct camshaft for 427/425hp??
11-19-2015, 05:58 PM
#1
Drifting
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what is correct camshaft for 427/425hp??
wanting to get as close as possible to OEM specs for new cam, but info that i have been researching is getting pretty muddy! apparently they spec cams different now than in the "old days" and it is difficult, if not impossible to compare specs of new cam to advertised specs of the orignal cams.....what i have for my car is E905S cam from Elgin...they claim specs are .520 lift and .242 duration. i just recently discovered that whatever cam i use,, it should be grooved on last journal to oil properly....what cam is best/closest to original camshaft???? does anyone know? thanks, Rick
11-19-2015, 06:59 PM
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Unless you ruined your old cam just take that to your local machine shop and have them cut a groove for you. If you want a new one go your local auto parts store and order one from Sealed Power. Your still going to have to get a grove cut into it.
11-19-2015, 07:23 PM
#3
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Any one of these through Elgin, and should have the groove.....L-78, L-72,. L-81 and L-71....,,.these are all the same identical application
Also, the Elgin engine products are as good as you can get
Also, the Elgin engine products are as good as you can get
11-19-2015, 07:31 PM
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I would bet it doesn't come with a grove. When I was researching cams for my 66 396 block no one sold a cam with a grove.
11-19-2015, 08:29 PM
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11-19-2015, 10:54 PM
#6
11-19-2015, 10:59 PM
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11-20-2015, 06:45 AM
#8
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I know the L71 and L72 are the same grind, not sure about the L78, maybe it is too. I think Iorncross meant which ever one you specify, it will either need to have a groove in it or machined in it for his 66.
11-20-2015, 10:45 AM
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The Speed Pro (Federal Mogul) CS-165R is manufactured to the GM print (including Parkerizing) for the L-71/LS-6 camshaft. Thus it has no rear groove, but any machine shop should be able to duplicate it using the dimensions from the currently installed cam.
The only difference between the L-78/72 and L-71/LS-6 cams is the groove. Lobes and lobe phasing are identical.
'65 and '66 big blocks must have the groove and the proper "three-hole" rear cam bearing.
'67-up use a single hole rear bearing. The '67-up OE cams have no rear journal groove, but it's okay to use a cam with the groove.
Duke
The only difference between the L-78/72 and L-71/LS-6 cams is the groove. Lobes and lobe phasing are identical.
'65 and '66 big blocks must have the groove and the proper "three-hole" rear cam bearing.
'67-up use a single hole rear bearing. The '67-up OE cams have no rear journal groove, but it's okay to use a cam with the groove.
Duke
Last edited by SWCDuke; 11-20-2015 at 10:49 AM.
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