LS1/LM7 swap
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Joined: Jul 2009
Posts: 94
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From: Oak harbor Wa
LS1/LM7 swap
In the process of getting everything together for a 5.3 LM7 swap have a 4L60 ready and tore down the engine just to make sure what would be a good/decent cam up grade don’t want to rework the heads or springs
Burning Brakes
Joined: Jan 2003
Posts: 961
Likes: 275
From: Frederick MD
Also some of the castings actually leak coolant into the oiling system. If you have heads cast by Castech I’d junk them. Not worth it IMO
GM service bulletin on Castech heads.
Burning Brakes
Joined: Jan 2003
Posts: 961
Likes: 275
From: Frederick MD
As for not wanting to do springs, then leave the OE cam in it. Even the LS1 hotcam (which has probably the mildest lobes of any aftermarket cam) requires a spring upgrade. Do it once, do it right.
Race Director
Joined: Mar 2017
Posts: 11,953
Likes: 4,508
From: Virginia
Valve springs are pretty easy to do, and cheap. Do the valve seals at the same time (even cheaper!). You'll want to clean the heads and lap the valves anyway.
These might be the ones to use (I used them in my LS6). But do your own research on ls1tech.com.
These might be the ones to use (I used them in my LS6). But do your own research on ls1tech.com.
