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8volly

Mk1-3 Valve Specs

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8volly

Hi guys, trying to work out a big valve setup for my HH head but info is a little scattered and hard to find. On my search I've put together a quick spec sheet with part nr's and dimensions. There are a few gaps where i can't find reliable information so feel free to fill them in and let me know. All the info has been taken from part numbers from VAGCAT and early mk2 & mk2f haynes manuals, again if anything is wrong then let me know! 

 

I hoped to go down the pinto exhaust valve route for the inlet valve and try and find a slightly bigger valve for the exhaust, then read the early mk2 haynes manual and it states HH and HB valves are shorter, and so the pinto valves won't fit.. I'll have to measure mine tomorrow and update!

 

Polo valve sizes:

 

HH/HB valve sizes:

Inlet valve - 34.00mm x 104.00mm x 7.97mm stem (036109601F)

Exhaust valve - 29.10mm x 104.00mm x 7.95mm stem (052109611A)

 

GL/HK/HA valve sizes:

Inlet valve - 34.00mm x 110.5.00mm x 7.97mm stem (036109601F)

Exhaust valve - 29.10mm x 110.5mm x 7.95mm stem (052109611A)

 

 

Hydro head valve sizes:

AAU inlet valve - 32.00mm x 99.300mm x 7.965mm until July 1992 - From August 1992 6.970mm stem diameter. (030109601E - 7.965mm) (030109601N - 6.970mm)

 

Inlet valve (all other) - 36.00 x 99.300mm x 7.965mm until July 1992 - From August 1992 6.970mm stem diameter. (030109601D - 7.965mm) (030109601L - 6.970mm)

 

Exhaust valve - 29.00mm x 99.300mm x 7.945mm until July 1992 - From August 1992 6.050mm stem diameter. (030109611A - 7.945mm) (030109611D - 

 

PY exhaust valve - 29.00mm x 99.300mm 7.945mm (part nr?)

 

 

Pinto/Transit exhaust valve - 36.2mm x 110.55mm x 8.02mm stem (part nr?) Used as a larger inlet valve on flat head type mechanical cylinder heads:

Application: 

  • Ford Capri Mk1/Mk2/Mk3 2.0 1972-1987
  • Ford Cortina Mk3/Mk4/Mk5 2.0 1970-1982
  • Ford Escort Mk1 RS2000 2.0 1973-1974
  • Ford Escort Mk2 RS2000 2.0 1975-1980
  • Ford Granada Mk2 2.0 1977-1985
  • Ford Granada/Scorpio Mk3 2.0 1985-1989
  • Ford Sierra 2.0 1982-1989
  • Ford Transit Mk2/Mk3 2.0 1978-1994
  • TVR Tamsin 200 2.0 

 

Double valve springs for mechanical head:

Outer valve spring: 078109623A (Same as standard)

Inner valve spring: 078109633A (Same as KR/2E/ABF)

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kwijibo_coupe

Moved to FAQ and pinned. Good work :)

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kwijibo_coupe

Just to add to this a little I've been measuring up some cylinder head ports. Results below showing what car the head came from, the part number and the sizes of the inlet and exhaust ports in mm.

 

Mk3 1.0 (AAU) head - 030103373D Inlet 24x27 Exhaust 27x29
Mk2 1.0 (HZ) head - 030103373B Inlet 28x32 Exhaust 28x29
Mk3 1.3 (AAV) head - 030103373L Inlet 29x34 Exhaust 29x31
Mk3 GT/G40 (3F/PY) head - 030103373G Inlet 28x34 Exhaust 29x29

 

The 1.3 head shows it is the largest but the one I have has apparently been ported. I suspect a standard one would be closer to the sizes of the HZ head above. Also the port sizes of that 1.3 head look to match the gaskets perfectly, so if you're looking to port your head that might be some sizes to aim for.

 

The mk3 1.0 head is by far the smallest so anyone with a mk3 1.0 looking to gain a bit more poke maybe consider porting the head or swapping to a 1.3 or GT/G40 head if you fancy getting that involved.

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prankstar2003

Just a question, (I know the thread is old) but if using pinto exhaust valves as inlet valves, how is the difference of ~6mm stem length mitigated? Do they need to be cut down or is there enough adjustment in the head?

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