LS3 / LS7 Based 427 - What are the Differences?
Thread Starter
Drifting
Joined: Mar 2006
Posts: 1,489
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From: Atlanta GA
LS3 / LS7 Based 427 - What are the Differences?
With the LS3 using a 4.100" stroke and the LS7 using the 4.000", what would be the differences in each setup be (performance wise and dyno charts)?
Thx
Thx
Thread Starter
Drifting
Joined: Mar 2006
Posts: 1,489
Likes: 5
From: Atlanta GA
what would the performance differences in a 427 (ls3) vs a 427 (ls7) be?
Instructor
Joined: May 2007
Posts: 211
Likes: 0
From: Mountain View CA
Ever so slightly better rod ratios on the LS7 I'd guess...Which would translate to an engine that would be safer at higher RPMs...I think the difference would be pretty small, but I guess I could be wrong 
Drifting
Joined: Nov 2002
Posts: 1,651
Likes: 125
From: laguna niguel ca
Performance wise and dyno charts: You would need to know more than just strokes. Cam size, head work, intake headers , tunning, etc. my LS3 427 made 525rwhp/500rwtq with a somewhat small cam, but had a lot of heads work done to the LS3 heads. There are all kinds of different paramaters to consider. I'm told that a 440 inch LS7 with head work and a small street cam can give as much as 580-600rwhp. for whatever that's worth. Again more info is need.
