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:
http://i540.photobucket.com/albums/g...ps2qdqinmh.jpg

http://i540.photobucket.com/albums/g...psc0rkhp4o.jpg

http://i540.photobucket.com/albums/g...ps6iupb24v.jpg

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.

Re: Larger Intake Valve Cylinder Head Work
 

You do amazing work Phil.....great to have that talent to perform those tasks....will be anxious to see and hear the results of your build.....:)

Re: Larger Intake Valve Cylinder Head Work
 

Does anyone know if a 3D solid works (or similar) file exists for the LT 5 head? Would be very useful for designing modifications..

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Re: Larger Intake Valve Cylinder Head Work
 

Excellent Phil. Looks like the Gen III chamber a bit. Hope the airflow numbers meet your target too.

Re: Larger Intake Valve Cylinder Head Work
 

That's the ticket :cheers: What metal seats will you be using ?

Re: Larger Intake Valve Cylinder Head Work
 

Seats are a tungsten alloy from Tucker.

Re: Larger Intake Valve Cylinder Head Work
 

Any loss of torque?

Re: Larger Intake Valve Cylinder Head Work
 

Should have plenty.


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Re: Larger Intake Valve Cylinder Head Work
 

Looking great!

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Re: Larger Intake Valve Cylinder Head Work
 

FourTwentySeven. Has a nice ring to it.