Just checked the NHRA specs (1969 396 vs 1970 402) & it looks like the 401 alum. head gets a tighter chamber in both the 402 & the 396 @ 103.3 On the other hand the iron 396 is @ 104.9 vs the 402 iron @ 106.9.
Dome on the 396 is 40.05 @ .361 ht Vs the 402 with 39.53 @ .344 ht. That was probably done to equalize the difference in bore vol.(CC).
The 396 ex is 1.845, in alum & 1.725 in iron vs the 402 @ 1.885 in iron and alum.
It also looks like the 402 gets to use a better manifold than the original pancake version. I'm not real familar with the manifols esp. the 3967474, but it seems like the 402 & 396 would be at least equal in that area.
You need to check the NHRA Classification guide for the HP. There are some differences between bodies & stick vs auto in the 402 vs 396.
good luck hope this helped
DISCLAIMER: all numbers are form NHRA Tech Specs. I'm not responsible for type-o's or numbers that are transposed. I am responsible for my opinions.
Adger Smith
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Adger Smith (Former SS)
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