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Old 09-29-2011, 07:05 PM   #1
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Mod the LSA or Sell It And Replace with Supercharged LS7 ???

Ladies and Gents,

Here is where I am struggling and I will need to make a decision fairly soon. I am currently considering two choices and I would like your opinions please along with any supporting information to back your stance:

Turn the LSA into a 417 Stroker with GT-9 or GT-11 cam, forged pistons, 2300 maggie, 10/14 rib pulley upgrade cranking about 750 hp.

OR

Sell the stock 580 HP LSA engine for about $12K and replace with an LS7 block, LS9 heads, forged pistons, GT-9 cam, 10/14 rib pulley upgrade, headers, cranking about 775 HP.

So what do you guys say???
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Old 09-29-2011, 07:18 PM   #2
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LS7 is a great motor, but if you are going to go with a 427, I have heard the RHS block has thicker cylinder walls and holds up to boost better. There is a reason why GM went with the 6.2 in the ZR1!

One more point, myself, I like the whipple, great whine and from what I have read and seen, the 2.9L Whipple seems to make = or more HP at lower boost and lower IAT, for about the same cost.
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Old 09-29-2011, 07:38 PM   #3
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LS7 block doesn't like boost...very thin cylinder walls to manage that 427ci volume...
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Old 09-29-2011, 07:44 PM   #4
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LS7 block doesn't like boost...very thin cylinder walls to manage that 427ci volume...
This. And the first post too.
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Old 09-29-2011, 07:45 PM   #5
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Wouldn't the first option be a little less expensive, too?
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Old 09-29-2011, 07:53 PM   #6
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LS7 block is relatively expensive. Stroke LSA and call it a day, after your cam ans SC. How much power anyways? Maybe you could get by with rods and pistons on LSA. Same heads as LS9...
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Old 09-29-2011, 07:59 PM   #7
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My understanding also is the LSA block has additional reinforcement in the block over the LS3/LS9 block, though I do not know that for fact, I seem to remember reading it in the description of the LSA motor. If you are going for increased boost, forge the LSA, get a larger twin screw blower or TT and have at it!
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Old 09-29-2011, 09:02 PM   #8
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All Al 6.2's should be the same. After the LS9 came out the LS3 got updated to the new casting.
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Old 09-29-2011, 09:09 PM   #9
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Quote:
Originally Posted by BiggFoot View Post
Ladies and Gents,

Here is where I am struggling and I will need to make a decision fairly soon. I am currently considering two choices and I would like your opinions please along with any supporting information to back your stance:

Turn the LSA into a 417 Stroker with GT-9 or GT-11 cam, forged pistons, 2300 maggie, 10/14 rib pulley upgrade cranking about 750 hp.

OR

Sell the stock 580 HP LSA engine for about $12K and replace with an LS7 block, LS9 heads, forged pistons, GT-9 cam, 10/14 rib pulley upgrade, headers, cranking about 775 HP.

So what do you guys say???
A cheaper option:
Pulley down the stock s/c
Forge pistons, rods
Cam
Tune
Headers
See where that will put ya.

Stock s/c not good enough go with the LS9 s/c. They do it for the CTS-V.

So far what has been offered to the LSA/LS9 is s/c aftermarket inlets and larger heat exchangers net great results.
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Old 09-29-2011, 09:09 PM   #10
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You can get that much horsepower out of the LSA without spending as much money.
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Old 09-29-2011, 09:11 PM   #11
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You can get that much horsepower out of the LSA without spending as much money.
+1
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Old 09-29-2011, 11:41 PM   #12
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Lingenfelter is where im going 700+hp at the crank Lingenfelter is the choice for me

Last edited by payne.jeremy82; 09-30-2011 at 01:15 AM.
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Old 09-30-2011, 12:38 AM   #13
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There are better options than the LS7 if you want to swap in a supercharged engine.
Quote:
Originally Posted by payne.jeremy82 View Post
http://www.lingenfelter.com/engine-p...charged-engine-
This is where im going 700+hp at the crank Lingenfelter is the choice for me
I just lost a little respect for Lingenfelter after looking at that URL (link is broken by the way). Someone over there needs to be told that the LS3/L99/LSA/LS9 engines are not 378 cubic inches, because they're not exactly 6.2L ... they're 6.162L, which works out to 376 cubes. I thought they'd be better than that.
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Old 09-30-2011, 12:47 AM   #14
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Originally Posted by DGthe3 View Post
There are better options than the LS7 if you want to swap in a supercharged engine.
I just lost a little respect for Lingenfelter after looking at that URL (link is broken by the way). Someone over there needs to be told that the LS3/L99/LSA/LS9 engines are not 378 cubic inches, because they're not exactly 6.2L ... they're 6.162L, which works out to 376 cubes. I thought they'd be better than that.
Apparently they listened to ya... I just got "page not found."
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