GM 5.7L Stage 1

September 25, 2020 by  
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SKU: 28846532debc Category:


GM Factory 5.7L 241,853,806
Our stage 1 cnc program is built using our latest valve job and port design for the 5.7L GM cylinder head castings. This version is designed to work with the stock 2.00-1.55 sized valves. Designed as a package for the budget conscious guy who wants respectable gains out of his factory castings.

Disassemble and clean
Fully CNC port Intake and exhaust runners
Competition multi angle valve job
Precision grind all 16 valves with backcut on intake valve
Hand blend valve job into porting
Flow test with sheet included
PCD Flat mill decks up to .030″
Custom Blueprint Assembly insuring all assembly heights and spring pressures are correct
TEA/PAC racing Dual .650″ spring kit with Steel retainers

Lift Intake Exhaust
0.100 67 60
0.200 137 113
0.300 202 163
0.400 249 202
0.500 288 228
0.550 292 237
0.600 296 244
* Tests conducted at 28″ of water, 4.00″ bore, 1.875″ x 4.0″Exh. pipe

Customer will need to supply their cores

Oversize valves and optional springs are available

Give us a call at 330-634-2155
Send us an email at

Additional information

Weight 60 lbs


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