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Thread: LS7 engine
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07-18-2006, 11:15 PM #1
LS7 engine
How hard would it be to swap out an LS1 engine from a 98 Camaro, and replace it with GMs LS7 small block? Apparently is has an electronic throttle body; mine uses the cable. I mean, sure...$14,000. But 7.0 liters, almost 430 c.i., 500HP...over and done with.
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07-19-2006, 08:53 AM #2
You can pull those #'s out of your ls1...hell more than that, for half the cost. Just my .02
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07-19-2006, 09:27 AM #3
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pewter- 99 Trans Am
If I had half of that I believe that I could get 500hp with just heads, cam,headers,intake and a good catback setup.
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07-19-2006, 11:00 AM #4
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Pewter- all bore 370 Trans Am
the ls7 is a small block?? there are quite a few people close to the 500hp mark on a 346. Its about proper research. a 402 or 408 could get you that at a fraction of the cost too.
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07-19-2006, 11:02 AM #5
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but to answer your question, you should be able to swap the motor and use the stock pcm. change over the TB to a fast cable driven. That would be my guess. The people to ask would be Katech. They've already done it
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07-20-2006, 01:02 AM #6
Wow! Quick response. Thanks. It's just that if I ever had to replace the motor, while I would love to be able to drop in a 572, this one would be more realistic for me.
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07-20-2006, 09:31 AM #7
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well if you have that kind of money to throw at it, then go for it, but you could have something built to have the same power for a lot less.
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07-20-2006, 12:19 PM #8
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07-20-2006, 12:54 PM #9
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Pewter- all bore 370 Trans Am
isnt it 7.0 liters? 427 cu. in.? I thought that would be considered a big block...at least in the old days ( not that im from them) up the 383 was still small and from 396 on up was considered big..or up to 396 small and then anything bigger was a big block. please explain.
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07-20-2006, 02:46 PM #10
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I didn't think cubic inch has anything to do w/ the size of a block.
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07-20-2006, 02:50 PM #11
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Pewter- all bore 370 Trans Am
guess not...i know they're resleeved, but didnt know if they used a 5.7 block or 6.0 block...i guess with the new gen 3 on up it doesnt matter as much as it did in the old days.
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07-20-2006, 02:58 PM #12
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Pewter- all bore 370 Trans Am
LS1 Darton M.I.D. Sleeved Block
4" Crank
LS1 6.125" Rods
im guessing the bore is 4.125 so maybe they're using a c56 block or 6.0.
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07-25-2006, 10:52 AM #13Mods: FAST 90mm, Nick Williams 90mm TB, TR 230/224 .581/.567 111 LSA, CC 921 springs, Hooker LTs, Hooker ORY, SLP Loudmouth, Eibach Pro Kit, Billstein HD, Baer Eradispeed, Whisper Lid, BMR SFCs, BMR Adj. LCAs, BMR reloc. brackets, HPTuners. 418HP/390ft-lbs rearwheel on a DynoJet.
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07-25-2006, 11:09 AM #14
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Pewter- all bore 370 Trans Am
thanks. i did some searching and found out the info i needed. 6.0 block, 4" crank, 4.125 bore.
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07-25-2006, 12:12 PM #15
It has to do with the dia. of the cylinder bore, the stroke of the piston, and the specs of the crank shaft.
Yes, 7.0 liters is a 427 Big Block engine. Also the size of the engine block does depict big block to small block. the differences are there, you just have to know what you are looking for and at. Yes, you can bore a small blck to big block specs, but the fact is, its still considered a small block bored 'x' amount over to bring it to big block specs.
396 c.i. displacement and up is considered 'big block', although the 408 and 409's are considered small blocks because those were created with a bored and cranked small block engine
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07-26-2006, 04:03 PM #16
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07-26-2006, 05:30 PM #17
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Red- 2000 Trans Am
I know i am new here but i am going to disagree with you. The LSx Blocks are all small blocks. Cubic inches mean nothing. You can get a Gen 1 style block from world that is 454 cubic inches and still considered a small block. THe exterior of the block dictates its designation between small and big block.
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07-26-2006, 05:34 PM #18
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im gonna make some phone calls and find out for sure.
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07-27-2006, 10:37 AM #19
my bad if i may have confused. I wasn't implying that the LSx series engines were the focus of my big block/small block analysis. I'm still learning about teh LSx engine so I may be wrong and never mind being corrected. I was referring to the old cast iron blocks from the 60's up to the LT1.
You are correct the exterior of the block designates a visual small block from a big block. However, in the case of the LSx series I am not sure I have seen a small block-big block if you know what I mean. I just know that a small block can be bored 'x' amount over to make a big block with the correct crank, cylinder bore size, pistons and supporting bottom end. combine that with a deep set of small block heads and yes you now have a big block displacement in a small block configuation.
anyone please feel free to correct me or share their knowledge w/me.
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07-31-2006, 11:08 PM #20
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