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LS7 into a LS3 hole

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Old Aug 11, 2019 | 09:43 PM
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Default LS7 into a LS3 hole

I have a LS3 in my 1980 corvette. Can I just drop a LS7 in there if I put an oil pan on it? Same everything else? Like serpentine belt set up and mounts etc.
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Old Aug 11, 2019 | 09:46 PM
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Ls7 is drysump
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Old Aug 11, 2019 | 09:58 PM
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Yeah, pretty much drops in after you do a wet sump conversion.. You might need a custom damper to obtain the pulley spacing you need. The heads are a little bit taller so watch clearance around the coils and brackets. Location of header collectors will spread out just a tad too.

All in all there isn't a lot of difference between a well built LS3 stroker and a well built LS7. I thought the LS7 was kind of a waste of money in hindsight. The LS7 was expensive!

Last edited by QwkTrip; Aug 11, 2019 at 10:05 PM.
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Old Aug 12, 2019 | 09:05 AM
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You have a great starting point with having the LS3 already. You would save money by throwing a cam in it and maybe even a basic CNC job on the heads and make some good power instead of the price of a LS7 and then to converter it to wet sump. With a good combo you could make 470-500 rwhp with the LS3. Tons of variables of course. Stick with what you got!
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Old Aug 13, 2019 | 02:12 PM
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As mentioned, if you go LS7, you would need a new crank and drill a oil dip-stick hole to convert it to a wet-sump set-up.

And good H/C set-up will wake up your LS3 to the tune of 80-100 HP at the wheels.

Jus' sayin'.....

KW
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Old Aug 13, 2019 | 04:06 PM
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Post#4....ls7 isn't needed unless u just wanna be able to say you've got a 427. 650 @ the crank isn't relitively out of this world with 376 cubic inches.
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Old Aug 13, 2019 | 07:19 PM
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Originally Posted by Smokey B
Post#4....ls7 isn't needed unless u just wanna be able to say you've got a 427. 650 @ the crank isn't relitively out of this world with 376 cubic inches.
The gpi intake tests hit damn near 700 crank on a couple of their tests on a 376. Big cam high rpm but they cleared 650 handily on several intakes.
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Old Aug 13, 2019 | 11:49 PM
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Brother didn't even think about that. Was thinking of a general reference. 11.5 and or about a 240 ish cam with a 376.
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Old Aug 14, 2019 | 01:41 AM
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Example....way before.....

https://www.yellowbullet.com/forum/s...d.php?t=449281
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Old Aug 14, 2019 | 03:04 AM
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Originally Posted by Smokey B
Brother didn't even think about that. Was thinking of a general reference. 11.5 and or about a 240 ish cam with a 376.
Gotcha. But I was agreeing with you and backing up that it can and has been done
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Old Aug 14, 2019 | 09:45 AM
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I know just wanted to get you the simple build from 3pedals ... everyone else also.
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