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Head differences

alpine_64

Donation Time
The very late heads have single springs and no sparking plug tubes and the slightly larger chambers ( like a super subtle vizard profile)

The earlier heads have the double valve springs and for the SI the slightly smaller valves

Inlet ports are same size execpt for holbay heads which are a different animal all together
 

Kristian Jonsson

Donation Time
The very late heads have single springs and no sparking plug tubes and the slightly larger chambers ( like a super subtle vizard profile)

The earlier heads have the double valve springs and for the SI the slightly smaller valves

Inlet ports are same size execpt for holbay heads which are a different animal all together

Slightly larger chambers! They look the same, but I suppose someone have measured them.
Double springs and different spacers seems to be mixed. Maybe by someone else, but now it was about the channels
 

jumpinjan

Bronze Level Sponsor
The very late head's valve springs are shorter in height, but the coils are stronger. I tried to install the taller, early springs, but there is a risk of coil binding with these later heads.
Jan
 

Jay Laifman

Donation Time
FWIW, in looking for info on my Holbay cam, I came across the Holbay H120 head spring specs. I thought I'd add it here:

Two springs
Free length: 1.584" inner; 1.694" outer
Length fit: 1.280" inner; 1.400" outer
Load fitted: 28.3 lb inner; 52 lb outer
 

RootesRooter

Donation Time
Could we ask what your source was?


FWIW, in looking for info on my Holbay cam, I came across the Holbay H120 head spring specs. I thought I'd add it here:

Two springs
Free length: 1.584" inner; 1.694" outer
Length fit: 1.280" inner; 1.400" outer
Load fitted: 28.3 lb inner; 52 lb outer
 
Last edited:
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