| Watts Shop Performance |
| Ported Heads |
| Ported LT-1 Heads |
Ported LT1 heads have a 15 angle valve job (radius cut). Long and short side reworked,
roof raised and guide thinned. Chambers reshaped and valves unshrouded to enhance
swirl and exhaust scavaging. Viton, teflon seal for better oil control. Spring pressure
checked and installed to correct height. Heads checked for cracks and warpage.
(Aftermarket springs or spring pressure and installed height change upon request).
roof raised and guide thinned. Chambers reshaped and valves unshrouded to enhance
swirl and exhaust scavaging. Viton, teflon seal for better oil control. Spring pressure
checked and installed to correct height. Heads checked for cracks and warpage.
(Aftermarket springs or spring pressure and installed height change upon request).
Stock LT-1 Head WSP Ported LT-1 Head
Port: 170cc Port: 176cc
Chamber: 58cc Chamber: 59cc
Valve sizes: 1.94/1.50 Valve sizes: 1.94/1.50
Valve lift: Intake: Exhaust: Valve lift: Intake: Exhaust:
0.100 72 52 0.100 67 46
0.200 129 100 0.200 129 103
0.300 180 130 0.300 189 140
0.400 213 142 0.400 235 173
0.500 214 149 0.500 249 181
0.600 215 154 0.600 247 184
I/E Split 67% I/E Split 74%
Port: 170cc Port: 176cc
Chamber: 58cc Chamber: 59cc
Valve sizes: 1.94/1.50 Valve sizes: 1.94/1.50
Valve lift: Intake: Exhaust: Valve lift: Intake: Exhaust:
0.100 72 52 0.100 67 46
0.200 129 100 0.200 129 103
0.300 180 130 0.300 189 140
0.400 213 142 0.400 235 173
0.500 214 149 0.500 249 181
0.600 215 154 0.600 247 184
I/E Split 67% I/E Split 74%
Valvetrain
Valve Spring Retainers
Titanium Retainers
Chrom Moly Retainers
7 Degree Retainers
10 Degree Retainers
Solid Roller Lifters
Pop Up Lifters
Vertical Bar Lifters
Chevy Lifters
Ford Lifters
Mopar Lifters
Pontiac Lifters
Olds Lifters
Valve Spring Retainers
Titanium Retainers
Chrom Moly Retainers
7 Degree Retainers
10 Degree Retainers
Solid Roller Lifters
Pop Up Lifters
Vertical Bar Lifters
Chevy Lifters
Ford Lifters
Mopar Lifters
Pontiac Lifters
Olds Lifters
| Ported LT-4 Heads |
Ported LT4 heads have a 15 angle valve job ( radius cut). Long and short side reworked,
roof raised and guide thinned. Chamber reshaped and valves unshrouded to enhance
swirl and exhaust scavanging. Viton, teflon seal for better oil control. Spring pressure
checked and installed to correct height. (Aftermarket springs or spring pressure and
installed height change upon request).
roof raised and guide thinned. Chamber reshaped and valves unshrouded to enhance
swirl and exhaust scavanging. Viton, teflon seal for better oil control. Spring pressure
checked and installed to correct height. (Aftermarket springs or spring pressure and
installed height change upon request).
Stock LT-4 head WSP Ported LT-4 head
Port: 195 cc Port:
Chamber: 56cc Chamber:
Valve sizes: 2.00/1.55 Valve sizes: 2.00/1.55
Valve Lift: Intake: Exhaust: Valve Lift: Intake: Exhaust:
0.100 78 67 0.100
0.200 147 109 0.200
0.300 197 133 0.300 Coming Soon!!!
0.400 230 159 0.400
0.500 250 172 0.500
0.600 243 177 0.600
I/E Split 69% I/E Split
Port: 195 cc Port:
Chamber: 56cc Chamber:
Valve sizes: 2.00/1.55 Valve sizes: 2.00/1.55
Valve Lift: Intake: Exhaust: Valve Lift: Intake: Exhaust:
0.100 78 67 0.100
0.200 147 109 0.200
0.300 197 133 0.300 Coming Soon!!!
0.400 230 159 0.400
0.500 250 172 0.500
0.600 243 177 0.600
I/E Split 69% I/E Split
| Ported LS1 Heads |
Ported LS1 heads have a 15 angle valve job (radius cut). Long and short side radius
reworked, roof raised and guide thinned. Chambers reshaped and valves unshrouded to
enhance swirl and exhaust scavaging. Viton, teflon seal for better oil control. Spring
pressures checked and installed to correct height. (Aftermarket springs or spring
pressure and installed height changed upon request). LS1 is a 17 degree valve head
requiring a different port job than a 23 degree head (LT1-LT4, early chevy).
reworked, roof raised and guide thinned. Chambers reshaped and valves unshrouded to
enhance swirl and exhaust scavaging. Viton, teflon seal for better oil control. Spring
pressures checked and installed to correct height. (Aftermarket springs or spring
pressure and installed height changed upon request). LS1 is a 17 degree valve head
requiring a different port job than a 23 degree head (LT1-LT4, early chevy).
Stock LS1 Head WSP Ported LS1 Head
Port: 204cc Port:
Chamber: 65cc Chamber:
Valve Sizes: 2.00/1.55 Valve Sizes: 2.00/1.55
Valve Lift: Intake: Exhaust: Valve Lift: Intake: Exhaust:
0.100 83 55 0.100
0.200 134 98 0.200
0.300 189 130 0.300 Coming Soon!!!
0.400 222 156 0.400
0.500 240 175 0.500
0.600 252 182 0.600
I/E Split 61% I/E Split
Port: 204cc Port:
Chamber: 65cc Chamber:
Valve Sizes: 2.00/1.55 Valve Sizes: 2.00/1.55
Valve Lift: Intake: Exhaust: Valve Lift: Intake: Exhaust:
0.100 83 55 0.100
0.200 134 98 0.200
0.300 189 130 0.300 Coming Soon!!!
0.400 222 156 0.400
0.500 240 175 0.500
0.600 252 182 0.600
I/E Split 61% I/E Split
| Custom Head Porting Service Available |
Custom head porting available upon request, for Chevy, Ford, street or race heads. Full
port jobs to basic head clean up. Valve job (15 angle) included with every port job and
Viton seals included. Port jobs tailored to your application. We do mean custom, valve
guide changes ( guide diameter), spring seat diameter changes, intake face recut, angle
mill or flat mill, head bolt holes enlarged and exhaust redrilled for different header flange.
All port jobs come with a flow sheet before and after the port job. Pricing varies on the
port job, so call or email for pricing.
port jobs to basic head clean up. Valve job (15 angle) included with every port job and
Viton seals included. Port jobs tailored to your application. We do mean custom, valve
guide changes ( guide diameter), spring seat diameter changes, intake face recut, angle
mill or flat mill, head bolt holes enlarged and exhaust redrilled for different header flange.
All port jobs come with a flow sheet before and after the port job. Pricing varies on the
port job, so call or email for pricing.
