okay so i'm looking at getting some 5.3 heads to put on my 98 ls1 block and was wondering what the best ones to get are and what do i need to do to them thats worth the money.

i'm waiting on getting a cam until last because i'm gonna get a custom grind for it.

 

ive got the stage 2.5 5.3s from texas speed, they work well and you can get them used easily for 1k.

 

well i can get stock ones for around 100 bucks, i was just wanting to know what the main things to do to them that will help.

i'm def gonna get em ported and polished for sure.


i was just wondering if some of the newer ones might be a litte better than the older ones or visa versa

 

Mine came from TEA. They were like $1600 with no core. Brand new castings used. Very pleased with them. Are you planning to port/polish yourself, or have it done?

 

i'm good with a machinist so i'll probably have him do it. i would buy some heads ready to go but i don't have the money like that to throw at them.

what consists of a 1.5 stage heads?

 

You need to put 2.02/1.57 valves in them.

 

Casting Number 241
Head: 1997+ LS1 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12559806 (1997-98) Chambers = 69cc
12559853 (1999-00)
12564241 (2001-03)
Combustion Chamber Volume: 66.67cc
Compression Ratio: 10.1:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches


Casting Number 243
Head: 2001 LS6 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12564243
Combustion Chamber Volume: 64.45cc
Compression Ratio: 10.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 706 + 862
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 373
Head: 1999-2000 LQ4 6.0 Litre Truck
Material: Cast Iron
Part Number:
12561873
Combustion Chamber Volume: 71.06cc
Compression Ratio: 9.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 317
Head: 2001+ LQ4 6.0 Litre Truck
Material: Aluminimum
Part Number:
12572035
Combustion Chamber Volume: 71.06cc
Compression Ratio: 10:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches



the 706 and 862 head have a smaller itv 1.89 and you would need at least 2.00 or 2.02 to take atvantage of the higher compresion of 11.8:1 on a ls1

 

Pretty much the same as a Stage 2, but with stock 1.55 exhaust valves to keep the cost down.