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Intake valves

mototron

Donation Time
does anyone have a cross reference for better intake valves for 1725
The stock ones do not hold up for long at 7800 rpms
Thanks
Rocco
 

RootesRacer

Donation Time
does anyone have a cross reference for better intake valves for 1725
The stock ones do not hold up for long at 7800 rpms
Thanks
Rocco

Turned down datsun 510 valves are the trick.
Get aftermarket like from ferrea, not OEM as they are probably no better than stock.
You can install 1.600 and 1.400 valves if you cross link the seats.
 

Jim E

Donation Time
Did the big Datsun valves with Siamese seats once.... not sure it was worth the cost
 

RootesRacer

Donation Time
Did the big Datsun valves with Siamese seats once.... not sure it was worth the cost

I flowed the head after the work, for a stock engine definately not worth the money.
If you want an extra 1500 RPM on the top end it is.
I seem to recall a 30% increase in flow.
 
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