Valve springs

[spike123]

Yes the barrel is the 3/8 hold down / my frame is a 69 so I don't suppose the head makes much difference but will check the clearance for rear 3/8 hold down bolts

[spike123]

Ok measured springs
New ones large one L -1"27/32 coil dia 4.02mm 6 coils
Smaller spring L- 1"7/16. Coil dia 2.97mm coils 5
Old worn ones outer spring L- 1"3/4 coil dia 4.03 6 coils
Smaller L- 1"19/32 coil dia 2.62 mm coil 5

Head hold down bolts all 5/16 but the barrel is 3/8 bsf so either find a newer head for my 1970 engine coz the inlets are 1-5/16 not 30mm

My spitfire head I'm presuming can be used on either my 1966 or my 1970 engine is this correct as I've fitted new guides and valves to that one already

[Mike Farmer]

 

I've done that on a couple of heads. There is actually a service sheet that gives the correct sizes etc. I think Julian posted it here about three years ago.

Mike

[Bess]

Hi,
    The Spitfire head had 2 inlet sizes, 1 5/32"  and 32mm.

Best wishes...