5.3L / 5.7L LS1 combo questions..
03-07-2010, 05:42 PM
#1
5.3L / 5.7L LS1 combo questions.. I have the complete top end off my 1997 ls1 corvette sitting in my garage and just picked up a 5.3L iron block.
Questions:
If I use an LS1 crank with a 3.622" stroke what connecting rod length do I have to use?
I'm thinking about aluminum connecting rods to reduce rotating mass so I can rev this engine up high.
Forged 3.8" pistons.
Stock 1997 ls1 heads / intake. Better springs.
Stock ls1 cam maybe something crazy like a trex...idk.
All arp hardware.
Do you guys think this could be a solid 350hp 7000-7500rpm engine?
Can I have the stock 1997 ls1 heads milled down to increase my compression ratio some?
Thanks in advance.
Questions:
If I use an LS1 crank with a 3.622" stroke what connecting rod length do I have to use?
I'm thinking about aluminum connecting rods to reduce rotating mass so I can rev this engine up high.
Forged 3.8" pistons.
Stock 1997 ls1 heads / intake. Better springs.
Stock ls1 cam maybe something crazy like a trex...idk.
All arp hardware.
Do you guys think this could be a solid 350hp 7000-7500rpm engine?
Can I have the stock 1997 ls1 heads milled down to increase my compression ratio some?
Thanks in advance.
Last edited by ultradriver10000; 03-07-2010 at 09:50 PM.
03-07-2010, 09:40 PM
#3
Also if I use LS1 heads they have a bore of 3.9, the 5.3L will have a smaller bore say 3.78-3.8 what size head gasket would you go with? A 3.8 or a 3.9 bore?
03-11-2010, 09:36 AM
#4
Staging Lane
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The connecting rods from a 5.3L are the same as the 5.7L. Yes milling the cylinder head will increase your compression ratio along with using a thinner head gasket like the cometic. The stock head gasket compressed operating thickness is .051" cometic offers a .040"
Yes this engine should make 350 hp easy prob over 400 hp with a Trex cam if you choose to get that route.
Yes this engine should make 350 hp easy prob over 400 hp with a Trex cam if you choose to get that route.
03-11-2010, 01:00 PM
#5
I have some stock 5.3 heads I'll give to you. You would be better off using them over the 97 heads.
The stock rod length is 6.098", but most forged pistons use a 6.125".
If you are going to bore the block then why not use 3.905" pistons and make an iron 5.7?
Definitely stay away from the stock LS1 and the T'rex cam if you build a 5.3.
The head gasket needs to match what ever the largest bore is. If the gasket is left exposed it will glow red hot(or burn if not MLS) and cause detonation.
The stock rod length is 6.098", but most forged pistons use a 6.125".
If you are going to bore the block then why not use 3.905" pistons and make an iron 5.7?
Definitely stay away from the stock LS1 and the T'rex cam if you build a 5.3.
The head gasket needs to match what ever the largest bore is. If the gasket is left exposed it will glow red hot(or burn if not MLS) and cause detonation.
