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7.325 pushrod length????

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Old Apr 18, 2013 | 11:47 AM
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svtwhat?'s Avatar
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Default 7.325 pushrod length????

Putting together a cruiser engine for the power tour with spare parts I had laying around. Here's details
99 ls1 block stock deck
243 heads .004 off just to be true so stock height
Stock gm Mls gaskets
Ls7 gm cam
Ls7 lifters


I was under the assumption that the ls7 cam was a smaller base circle which would require a longer pushrod. I used the comp length checker. Cam at lowest part of camshaft base circle for valve measuring.

9 turns out =.450
Length checker = 6.800
Ls7 lifter preload = .070
Which equivilates to 7.320 or 7.325 for the sake of them being on the shelf.

Are the base circles indeed the same? Or what am I confused about here? I thought smaller base circle would mean longer pushrod.

Can anybody verify that the ls7 cam base circle is different than the stock ls1 cam? I've done numerous searches

Thanks!
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Old Apr 18, 2013 | 12:17 PM
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I thought Lifter preload for ls7 lifters are recommended at .080?? dont know if that makes much difference.
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Old Apr 18, 2013 | 12:29 PM
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.080 is what I have heard as well.
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Old Apr 18, 2013 | 02:15 PM
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Originally Posted by pauls99z28
I thought Lifter preload for ls7 lifters are recommended at .080?? dont know if that makes much difference.
It doesn't.

OP: Stick with what you measure, not what people 'say'
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Old Apr 18, 2013 | 02:21 PM
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Originally Posted by maxpower_454
It doesn't.

OP: Stick with what you measure, not what people 'say'

Agreed. My confusion is that is a stock ls1 cam runs a 7.400 rod from the factory and a ls7 cam supposedly has a smaller base circle, shouldn't I be looking at longer numbers not shorter? Now I can't seem to find exact specs to compare base circle sizes either.
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