10w-30 in either synthetic or regular oil will work fine.
5
SAE 10w-40
P-Metric size is P215-70 R14.
pontiac made the GTO the year of the car started in 1968. i would recomend the 1969 GTO judge
theres one on E-bay for sale right now for $500, check it out.
30 degrees
Gto
Follow wire from # 1 cylinder to cap. check position of rotor. see link
what year GTO?, need more information to answer your question.
6.5 quarts of oil
I believe the 400 cu. in. had 335 horse.
It's on the bottom of the oil pan.