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The valve notch on the OEM EFI pistons will not allow a valve larger than 2.15". The notch diameter is too small for anything larger.

We use a 2.110 Ferrea valve in all of the passenger car and EFI iron heads. We've found that for up to about 550 HP this is adequate for the pocket port work and port cross section.

A larger valve with out a concurrent increase in cross section offers no more peak flow. Slightly better low lift flow if the chamber is unshrouded and other chamber mods are done.






Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 

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Discussion Starter #3
The valve notch on the OEM EFI pistons will not allow a valve larger than 2.15". The notch diameter is too small for anything larger.

We use a 2.110 Ferrea valve in all of the passenger car and EFI iron heads. We've found that for up to about 550 HP this is adequate for the pocket port work and port cross section.

A larger valve with out a concurrent increase in cross section offers no more peak flow. Slightly better low lift flow if the chamber is unshrouded and other chamber mods are done.






Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
So it’s not really worth Changing valves then
 

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I'm actually doing this same build. 97 Short block with D0VE heads except mine already has 2.25" intake valves so I'm using a notching tool on the pistons. This is what Ford did with the crate engines back in the day so I'm told. Everything I have read indicates that this will be a nice combination.
 

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Discussion Starter #5
I'm actually doing this same build. 97 Short block with D0VE heads except mine already has 2.25" intake valves so I'm using a notching tool on the pistons. This is what Ford did with the crate engines back in the day so I'm told. Everything I have read indicates that this will be a nice combination.
Do you have a picture of the notching tool
 

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Before you do anything. How much power are you attempting to make?

Simply tossing larger valves in the heads with out the requisite port work and bowl sizing can be counter productive.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 

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Discussion Starter #7
Before you do anything. How much power are you attempting to make?

Simply tossing larger valves in the heads with out the requisite port work and bowl sizing can be counter productive.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
Well I’m on a Budget but if I could get in the 400s I think I would be happy. Since it’s a truck I guess I’m Mainly looking for torque
 

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This is the one that I'm using. Waiting for it to warm up a little and have some uninterrupted time to do the work and assembly. Should be running and in the car by the end of the summer.
 

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Before you do anything. How much power are you attempting to make?

Simply tossing larger valves in the heads with out the requisite port work and bowl sizing can be counter productive.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine

Scotty,

Not trying to hijack this thread but I think this could be informative for both the OP and myself.

The D0VEs that I have were rebuilt with 2.25" intakes by the previous owner. No port work was done. I was planning on notching the pistons, topping the valve guides and installing PC seals. The cam I chose is a Lunati Voodoo Advertised Duration (Int/Exh): 262/268 ;Duration @ .050 (Int/Exh): 219/227 ;Gross Valve Lift (Int/Exh): .540/.552 ;LSA/ICL: 112/108 ;Valve Lash (Int/Exh): Hyd/Hyd ;RPM Range: 1400-5800. I got the kit with the proper springs/retainers/etc...

I had considered doing some light port work to the heads (I am subscribed to your website) but was concerned about doing any bowl type work since the heads have already been rebuilt and I didn't want to mess up the valve seats.

What type of problems do you see with this combo and what would be the best solution.
 
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