Trying to model LS4.8, stock truck heads TX Speed 212/218 114 lsa" low lift " Shorty headers.
Anyone here that can confirm my cylinder head airflow numbers, ripped from a Camaro Site This is what I have :

""""
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
"""
.
Numbers seem within reason, reason, or out in space for stock cathedral port truck heads ?

 

Those were likely copied from this site. A sponsor at the time put them on his flow bench.

https://www.performancetrucks.net/fo...g-info-434396/

 

I am trying to make a DeskTopDyno file,

4.8 LS with 862 heads,
TX Speed "low lift" 212/218 cam,
and Magnuson TVS1900 @ 6psi

Can't find exact valve event data for TX cams, but I DAMN sure like how they run in natural aspirated 5.3

 

What cam are you trying to figure? Calculating the events at .050 is simple, however the .006 events would require lobe profile info.

 

I have purchased and installed (two) TexasSpeed 212/218 'Low Lift' camshafts, Neither furnished with a cam card. actual valve events are unknown.

The 5.3L natural aspirated performs very well in a heavy vehicle, with stock converter.
Trying to model same cam "Under Pressure".

I have email into Texas Speed, asking for detailed valve events.

See what they come up with.

 

What LSA And advance?

 

LSA 114
Installed straight up.

 

Thread from the dead:

ANY body able to give airflow numbers for cathedral port Gen III 5.3 Truck heads ?

 

See post #2 and follow the link.
https://www.performancetrucks.net/fo...g-info-434396/

 

Pasted from your link. Easier to find in bumped thread:


>..............................
Casting Number 706 and 862
Head: 1999+ 4.8L / 5.3 Liter Truck
Material: Aluminimum
Part Number:
12559862
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

Stock Head Flow Numbers
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

Thank you Brick...