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Old August 29th, 2013, 10:48 AM   #1
Haggar
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Default What motor swap for a Blazer? SBC? Big Block? LSx?

We are thinking about a full size blazer, to fit the family and still have a convertable. Something on 33s or 35s, mainly street duty, and maybe sand dunes. Not a general purpose wheeler.

Would want the engine to really get the blazer moving. I am thinking 500 crank HP..


I've never owned a blazer before so have no ideas of what the challenges are with motor swaps, but I'm assuming its a lot easier than swapping into a Jeep CJ!

Thinking there's 3 options:

1) Build a small block, which is obviously a bolt-in.

2) Build and swap in a big block

3) Build up an LSx motor


Your thoughts?
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Old August 29th, 2013, 10:50 AM   #2
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big block. torque is what gets things moving, bb has it to give. jmo
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Old August 29th, 2013, 11:05 AM   #3
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I'll second the big block, should pretty much bolt in as well.
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Old August 29th, 2013, 11:11 AM   #4
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LSX. 500HP should be easy and run nice, not lumpy.
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Old August 29th, 2013, 12:47 PM   #5
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Torque and HP are two different things. 500 HP from a big block should deliver close to 600 lb/ft of torque. 500 HP from a small block will produce only around 400 lb/ft torque but at a much higher rpm than the big block. An LS engine will produce slightly more torque for a 500 HP engine than the small block, but at a more usable (around 4000 rpm) engine range than the gen 1 small block.

If you are towing or off-roading, the big block is best. If general driving on street empty, the LS would be better.
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Old August 29th, 2013, 12:49 PM   #6
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Quote:
Originally Posted by jbsjunk View Post
LSX. 500HP should be easy and run nice, not lumpy.
x2 Normally I would vote big block, but a LS swap makes it also a good driver with decent mpg's. With proper gearing it should be all you need.

Last edited by montecarlo33; August 29th, 2013 at 12:52 PM.
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Old August 29th, 2013, 12:51 PM   #7
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I like the big block idea, with maybe a fuel injection adder.
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Old August 29th, 2013, 12:56 PM   #8
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lsx, those are aluminum too right? help keep it lighter overall. fuel injection for street duty.
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Old August 29th, 2013, 01:00 PM   #9
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lsx, those are aluminum too right? help keep it lighter overall. fuel injection for street duty.
"lsx" basically means any LS series engine. They made them both iron block with aluminum heads(older) and a aluminum block with aluminum heads(newer more expensive, but a tad more power and less weight).
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Old August 29th, 2013, 01:20 PM   #10
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Quote:
Originally Posted by montecarlo33 View Post
"lsx" basically means any LS series engine. They made them both iron block with aluminum heads(older) and a aluminum block with aluminum heads(newer more expensive, but a tad more power and less weight).
Isn't there an ls x crate engine?
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Old August 29th, 2013, 01:23 PM   #11
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Quote:
Originally Posted by Iggy View Post
Torque and HP are two different things. 500 HP from a big block should deliver close to 600 lb/ft of torque. 500 HP from a small block will produce only around 400 lb/ft torque but at a much higher rpm than the big block. An LS engine will produce slightly more torque for a 500 HP engine than the small block, but at a more usable (around 4000 rpm) engine range than the gen 1 small block.

If you are towing or off-roading, the big block is best. If general driving on street empty, the LS would be better.
If only there was some sort of ratio to tie the two together


I'd just like to see the OP finish a project
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Old August 29th, 2013, 01:26 PM   #12
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Quote:
Originally Posted by Lousypirate View Post
Isn't there an ls x crate engine?
There are a few specifically called LSX, the LSX376 abd LSX454, both with the iron LSX block.

Quote:
Originally Posted by Lousypirate View Post
lsx, those are aluminum too right? help keep it lighter overall. fuel injection for street duty.

I do happen to have an all aluminum LS2 and built 700R4 just sitting on the floor. 400hp/400 ft lbs stock..
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Old August 29th, 2013, 01:27 PM   #13
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If it's a DD I would go LSx. With that much power you will want to box the frame or it will cause some serious problems. Check out DIY4x4.com for solid mounts and he also has a precut frame boxing kit for K5 Blazers. CK5.com has a lot of knowledgeable people regarding all aspects of K5 Blazers, including various engine swaps. Another option would be an 8.1, giving you good low down torque and the driveability of a newer engine.
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Old August 29th, 2013, 01:34 PM   #14
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Quote:
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I do happen to have an all aluminum LS2 and built 700R4 just sitting on the floor. 400hp/400 ft lbs stock..
end thread.
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Old August 29th, 2013, 01:42 PM   #15
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Quote:
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end thread.
x2
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Old August 29th, 2013, 02:03 PM   #16
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Quote:
Originally Posted by ljense8 View Post
If it's a DD I would go LSx. With that much power you will want to box the frame or it will cause some serious problems. Check out DIY4x4.com for solid mounts and he also has a precut frame boxing kit for K5 Blazers. CK5.com has a lot of knowledgeable people regarding all aspects of K5 Blazers, including various engine swaps. Another option would be an 8.1, giving you good low down torque and the driveability of a newer engine.
just a cruiser. no wheeling except maybe the dunes once a year. Not a dd either.
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Old August 29th, 2013, 02:19 PM   #17
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Quote:
Originally Posted by feva4u View Post
I'd just like to see the OP finish a project
I was just going to say, theoretical engine/project build number skooterbuilt-1=haggar
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Old August 29th, 2013, 02:22 PM   #18
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If it's not a DD then a 454 with a lumpy cam would give it a sweet sound and great torque. Either way, I would recommend boxing the frame so it doesn't twist with that much power.
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Old August 29th, 2013, 04:08 PM   #19
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Quote:
Originally Posted by feva4u View Post
If only there was some sort of ratio to tie the two together


I'd just like to see the OP finish a project
The problem, is all the projects I post on this site don't make it, and all the vehicles that I have/build that I don't post here (In the last few years, there's the TJ I rebuilt, the XJ I rebuilt, and my current CJ7), then those I get done, and enjoy them a bunch.

This is our current CJ7, but it doesn't fit all 5 of us, so thinking of something bigger... I really don't wheel much anymore, but we like the dunes. Want some old school iron in a convertible that will fit 5 people.

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Old August 29th, 2013, 04:22 PM   #20
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had a 90 k5 with a LT1 in it, ~280hp ish at the crank (factory rated) It wasn't a slouch...

500hp is going to be killer. I'd suggest 5.3 with a cam and spray.
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