LS7 Engine In A C5 FRC
Thread Starter
Pro
Joined: Jul 2004
Posts: 654
Likes: 6
From: Indialantic Fl
LS7 Engine In A C5 FRC
I have a 2000 FRC and am thinking about installing a later model LS7 motor in it. Are there any threads on the forum where someone has already done this?
I don't want to reinvent the wheel if someone has already done it.
Thanks in advance for any help.
I don't want to reinvent the wheel if someone has already done it.
Thanks in advance for any help.
Race Director
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
It's a lot easier if you change it to a wet sump setup. If you do that, you'll need an electronic adapter to change the reluctor wheel signal to be compatible with your PCM. You'll need a couple harness extensions/adapters for the knock sensors, cam sensor, throttle body. You will have to extend the MAP wires. None of which is a big deal.
If you leave it dry sump, there are aftermarket systems that may be easier to fit than the stock LS7 system. You'll probably have to relocate the battery to the truck either way.
Another option for a 427 is to do what I did and Darton sleeve and LS2 block for a 4.125 bore with a 4.0 inch crank. You'll end up with a much stronger engine.
If you leave it dry sump, there are aftermarket systems that may be easier to fit than the stock LS7 system. You'll probably have to relocate the battery to the truck either way.
Another option for a 427 is to do what I did and Darton sleeve and LS2 block for a 4.125 bore with a 4.0 inch crank. You'll end up with a much stronger engine.
Last edited by WKMCD; Sep 3, 2010 at 06:26 PM.
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
^^ Yep and then you have the L92 427 option as well to save some money. All of them will bolt right in, that is not a concern for you (OP). If you have an engine built you order the correct reluctor with the crank so you don't need the converter box.
Thread Starter
Pro
Joined: Jul 2004
Posts: 654
Likes: 6
From: Indialantic Fl
Can anyone tell me a little more about the L92 option? This sounds like an interesting possibility, as the more I research the LS7 engine, it sounds like it may have some inherent weaknesses. The reason it initially sounded good was I wanted something that would be basically a stock GM crate type engine which I could cam up a little to get a little more power.
Le Mans Master
Joined: Apr 2001
Posts: 5,474
Likes: 717
From: Black Forest CO
You may want to give SDPC a call and talk to them about options. They are great to deal with. I did my LS7 based 427 (with ported L92 heads) for less money installed than the GM LS7 costs just for the crate engine. This includes the nice touches that I chose such as the Katech valve covers.
my .02...
my .02...
Le Mans Master
Joined: Dec 2000
Posts: 6,312
Likes: 399
From: North Haven, CT
I had ECS do an LS7 crate motor in my C5Z with a dry sump. They changed to the 24 tooth reluctor wheel, custom fitted an LS7 based Aviaid dry sump system and did a custom rear-mount battery box. LPE also makes some helpful conversion kits if you don't have a shop nearby to do the custom work. The LS7 setup in my car looks OEM.
Here is my thread with more details and pictures:
http://forums.corvetteforum.com/c5-z...billy2kfrc+LS7
Here is my thread with more details and pictures:
http://forums.corvetteforum.com/c5-z...billy2kfrc+LS7
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
Can anyone tell me a little more about the L92 option? This sounds like an interesting possibility, as the more I research the LS7 engine, it sounds like it may have some inherent weaknesses. The reason it initially sounded good was I wanted something that would be basically a stock GM crate type engine which I could cam up a little to get a little more power.
The LS3 427 is a 4.070 bore x 4.100 stroke. As such it is not recommended for a power adder ( nitrous or boost). It is the least expensive of the 427's. You can run a set of L92/LS3 heads on it and make decent power for decent money. The short block is $5550, or $10,200 intake to oil pan for a very nice combination.
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deff would like to see ur progress and how it works out for you
