wd 45 head vs wd head

[allis wc 17]

is there any difference between a wd head and a wd 45 head

 

[JMS/.MN]

WD45 head is an inch taller. 3 vs 4.

 

[old]

Doesn't the WD45 head also lower compression if used on a stock WD engine because of the deeper combustion area in them???
Hobby farm

 

[Big Boy]

Both heads are flat.

 

[old]

I knew the WD head was flat but it has been so many years I could not remember if the WD45 was or not.

 

[stu (ON)]

According to the service manual, the switch to a higher head took place at Engine Serial #W-289000. So, WD mid-production & later should have the taller head.

 

[allis wc 17]

does the switch to a taller head warrant a power gain

 

[Tramway Guy]

Didn't the taller head allow a change of spark plug position which worked better with the power crater pistons? Possibly they moved more to the center of the cyliner...

 

[Anonymous-0]

YES 3INCH ONES 4 INCH 4 INCH ROCKER ARMSTANDS ARE EASY BROKEN ALSO.depends on what you plan to do in stock form very little difference in worked form they can be some difference but it happens after 450 thousandths valve lift. most stock engines dont have that much lift unless you have a 175 allis .