Ls7 Head Users
03-14-2008, 10:13 AM
#1
Ls7 Head Users Im thinking of swapping my 243/fast90 setup for an LS7 TOP END PACKAGE
Who has done a similar swap and what kind of power gains did you observe?
I currently have a 4.125 bore LS2 427 w/ 243's that flow ~ 330 w/ an unported fast 90
Plans would be TSP LS7 HEADS, PORTED LS7 INTAKE AND A NEW CAM TO MATCH THE COMBO. I make just over 500RWHP now with equal TQ
Who has done a similar swap and what kind of power gains did you observe?
I currently have a 4.125 bore LS2 427 w/ 243's that flow ~ 330 w/ an unported fast 90
Plans would be TSP LS7 HEADS, PORTED LS7 INTAKE AND A NEW CAM TO MATCH THE COMBO. I make just over 500RWHP now with equal TQ
03-15-2008, 12:07 PM
#3
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Well I didnt do that but I went from a 505 rwhp L76/L92 stock heads and intake too my ported LS7s and ported LS7 intake and a slightly bigger cam and am making quite a bit more than that now.
03-15-2008, 02:40 PM
#4
We're doing almost exactly the same swap. We're swapping some 853s out on a LS7. Dont ask me why someone would build a 427 with these heads but they did.
It also has a fast intake. We're swapping it all for LS7 stuff, but we ran into some issues. Mainly, the pistons in it were flycut for the LS1 heads, which means the pockets are too far to one side, and too small. We had to pull the pistons to have them flycut. So we went ahead and did a freshen up on the motor. Rings and bearings. Total seal rings (customer request) polish the crank, and new clevites.
It also has a fast intake. We're swapping it all for LS7 stuff, but we ran into some issues. Mainly, the pistons in it were flycut for the LS1 heads, which means the pockets are too far to one side, and too small. We had to pull the pistons to have them flycut. So we went ahead and did a freshen up on the motor. Rings and bearings. Total seal rings (customer request) polish the crank, and new clevites.