LS heads

Cores required for all stock castings

I have ported other casting numbers but they cannot be listed currently

 

GM LS 3 $800 to port and do the valve job as shown Flows 370cfm

 

GM LS 243 $800 for porting and performance valve job (cores required)

007_zps57074297.jpg image by WeingartnerRacing photo 008_zps650684f8.jpg

Flow on a 4.030 bore with stock 2.00/1.550 valves No exhaust pipe (other valve sizes are available)

  INT        EX

.1-64         49

.2-147       103

.3-206       144

.4-250       180

.5-283       198

.6-281       214

.7-291       218

.8-300       221

.9-306       223

1.0-311

  All prices subject to change without notice