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Old 06-09-2013, 02:40 AM
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Originally Posted by gearheadslife View Post
you cutting the top of the bore to unshroud the valves with heads with bigger valves, or just letting them smash into the cyl wall/deck
Not a problem with using stock size 1.94x 1.50 valves in the 350 heads, on a 305 engine. They don't touch the cylinder walls.

Whether the valve is in fact shrouded is a relative thing. Event hnou the larger 1.94" valve is closer to the cylinder wall than a smaller valve,,, It still flows a LOT MORE AIR than the stock as cast 305 head with its tiny 1.72" valves does.
The area where the intake valve is closest to the cylinder wall is a low flow area any way.
The air flow is concentrated towards the spark plug as it enters the chamber, not towards the cylinder wall, which would be a 90deg turn.

The 1.94 valve gives a net over all flow increase, especially if/when the head is ported. Shrouding is not a issue on this motor using a 1.94" valve. Valve to cylinder wall clearance is not a issue with the 1.94 valve. It is closer than the stock valve is but not a issue worth bothering with. No I will not be notching the cylinder bore.

But a 2.02 valve would be different.

No dyno test either. It is very simple straight forward low cost build. The car's performance will tell the tale.

Last edited by F-BIRD'88; 06-09-2013 at 02:55 AM.
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