Larger Intake Valve Cylinder Head Work - ZR-1 Net Registry Forums

Jagdpanzer · 10-23-2017

For the 427 build I have underway will be going with 41.9 mm intake valves to increase air flow for feeding the the additional displacement. Here are a few photos of the work in progress for fitting the larger valves:

Target combustion chamber size is 43.6cc which results 12:1 static compression ratio. For comparison stock combustion chambers run around 39cc. The "clover leaf" shape of the stock chambers severely shrouded the larger intake valve and was removed to allow for better airflow, especially at lower cam lift. Also radiused the area around the outside of the exhaust valves to take full advantage of the larger cylinder bore diameter.

10-23-2017	#1
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,661	Larger Intake Valve Cylinder Head Work For the 427 build I have underway will be going with 41.9 mm intake valves to increase air flow for feeding the the additional displacement. Here are a few photos of the work in progress for fitting the larger valves: Target combustion chamber size is 43.6cc which results 12:1 static compression ratio. For comparison stock combustion chambers run around 39cc. The "clover leaf" shape of the stock chambers severely shrouded the larger intake valve and was removed to allow for better airflow, especially at lower cam lift. Also radiused the area around the outside of the exhaust valves to take full advantage of the larger cylinder bore diameter. __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

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