Question for my 5.3 build
#1
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Hi I have a 5.3 out of a 2000 truck, From what I’ve read I could use 317 heads that would flow better but at the cost of compression. so my question is if I used flat top pistons to raise compression and 317 heads how much compression would that leave me with and what kind of power would I gain, also what would be the best cam for this combo?
#2
TECH Senior Member
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You would be better off finding some 243/799 heads. Same ports with more compression.
#3
11 Second Club
iTrader: (3)
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Hi I have a 5.3 out of a 2000 truck, From what I’ve read I could use 317 heads that would flow better but at the cost of compression. so my question is if I used flat top pistons to raise compression and 317 heads how much compression would that leave me with and what kind of power would I gain, also what would be the best cam for this combo?
#4
#5
#6
TECH Senior Member
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LS engines with 10:1 compression can use regular unleaded fuel. All Gen IV 5.3's have 10:1 and use regular.
#7
11 Second Club
iTrader: (3)
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It would be lazy down low and I think the engine due to the smaller bore would respond much better with 862's or 706's but if your looking for the better of the two then the 243's would be the WTG unless you have plans on throwing boost at this thing. I really don't know how much of a power difference there is between the heads as camshafts play a big role in the engines performance and then there's of course the all mighty boost factor that can be thrown into the mix. What are your plans for the engine and what other changes are you making to the the drive line will dictate which way to go with a camshaft. TSP and Cam Motion can certainly help you choose the right cam for your application.
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#8
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It would be lazy down low and I think the engine due to the smaller bore would respond much better with 862's or 706's but if your looking for the better of the two then the 243's would be the WTG unless you have plans on throwing boost at this thing. I really don't know how much of a power difference there is between the heads as camshafts play a big role in the engines performance and then there's of course the all mighty boost factor that can be thrown into the mix. What are your plans for the engine and what other changes are you making to the the drive line will dictate which way to go with a camshaft. TSP and Cam Motion can certainly help you choose the right cam for your application.