817 heads

[409hotrod49merc]

Hey Guys,
Anyone know the stock valve spring specs for a set of 63, #817, 340 h.p. heads ??? Thank You..Steve

 

[64ss409]

From the 1964 shop manual for 817 heads. I don't have a 63 manual.
Free length 2.03
Outer 84-92@1.33
166-178@1.66
Inner 20-24@1.488
55-61@1.106
Installed Height 1 21/32 +or- 1/32

 

[409hotrod49merc]

From the 1964 shop manual for 817 heads. I don't have a 63 manual.
Free length 2.03
Outer 84-92@1.33
166-178@1.66
Inner 20-24@1.488
55-61@1.106
Installed Height 1 21/32 +or- 1/32

Thank You, appreciate the info......