svtwhat?

iTrader: (17)

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!

pauls99z28

iTrader: (32)

I thought Lifter preload for ls7 lifters are recommended at .080?? dont know if that makes much difference.

03Sssnake

iTrader: (20)

.080 is what I have heard as well.

maxpower_454

iTrader: (7)

It doesn't.

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

svtwhat?

iTrader: (17)

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.