Bigger valves in 302 heads?

#4323302 Cylinder Heads..

With the stock Intake Port Volume at {120 CC}, installing larger 1.88" Intake Valves
will have 'from Zero to Minimal Gain'.

Unless you perform some port work (Bowl Area) and (General Porting), stay with the
Stock 1.78" Intake Valve.

Just by going to larger valves without some port work, will have 'minimal gain', and that
gain will only be at Higher RPM's, not for Low-End Torque and Response.

Same thing wth the Exhaust. With the stock Exhaust Port Volume at {55 CC}, again installing
a larger 1.60" Valve will have 'Zero to Minimal Gain'.
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As a reference the 'J' Cylinder Heads with a 1.88" Intake Valve and Exhaust Valve 1.60" has
24% Larger Sized Ports.

* Intake Port Size = 149 CC
* Exhaust Port Size = 69 CC