Ok i'm doing my swap over to the ls1 Ill be putting on my 5.3 heads with an stock ls1 short block, I also have an ls1 intake would that be worth installing or what? Anything you'd advise to do while im doing the swap let me know,
Also I currently have a 93oct blackbear tune for my 5.3 with headers,ory,cai,servo,efans how rough will my truck run with a ls1 in it, muchless asking how soon will i need to retune

 

The truck intake is actually better than the ls1 intake. Keep that, it produces more torque which you need, plus it flows like the ls6 intake.

 

dame dustin, you really picked up the ls1 already? who you got it from? what kinda price you paid? you can om or text me. side note... did you see a nnbs silverado lately lol

 

Ya found my ls1 today trying to decide on heads 853 or 862 heads?

Found the motor from a guy in ponchutoula today 900$ long block intake to oilpan, 180 for compression on each cylinder should be picking it up tomorrow or wednesday not sure yet

 

Maybe up to 5500 rpm, but past that not a chance in hell.

LS1 intake will flow better in higher rpms, LS6 would be even better. But your best bet would be a NNBS or TBSS intake manifold with a 90mm throttle body if you really wanted to have a decent intake for a decent price

Also, OP, do not run the stock 5.3 heads. They will up the compression but they will not flow very well with that size engine. Keep the stock LS1 heads on it until you can get a decent set of 243/317/799 heads on there.

 

I have the 863s off the engine right now, should i go ahead and get them worked out, or should I leave those on the motor till i get my 5.3 heads out and get those worked?

 

http://www.smokemup.com/tech/ls1.php
Stock 5.3 Heads
Chamber 61.15 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 200 cc 63 128 179 210 218 221 226
Exhaust 70 cc 54 93 121 145 163 168 174
Valve Diameter Intake 1.89"
Valve Diameter Exhaust 1.55"
Part Number 12559852
12561706

Stock 6.0 Heads
Chamber 71.0 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake ??? 66 142 196 228 236 238 240
Exhaust ??? 59 104 137 155 167 173 177
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"

Stock LS1 Heads
Chamber 66.67 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 200 cc 67 122 178 215 219 223 227
Exhaust 70 cc 52 97 133 156 170 176 180
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12559853 (1997-98)
12559853 (1999-00)
12564241 (2001-03)

Stock LS6 Heads
Chamber 64.45 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 210 cc 62 126 184 224 251 256 257
Exhaust 75 cc 57 108 143 163 176 180 183
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12564243 (2001 +)
It shows the 5.3 and LS1 heads flow about the same. I just ask, because I'm doing the same build and I'm going to use my 5.3 heads so I could have around 10.9:1 comp.

 

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How much compression can you run and still have the computer be able to manage 87 octane fuel?

 

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