Install 2.02 Valves in 4343475 Heads?

[Franko]

The casting number on my heads that are on my 1971 340 is 4343475A, which have 1.88 intake valves. After perusing some websites it appears that they are 1986 – 1989 360 heads.

I read that swirl port heads were introduced in 1985, but I couldn’t determine if these heads were swirl port for sure, if that matters. I am also not sure if there are different runners on 1.88 heads of this vintage vs 2.02 heads which would negate for me the 2.02 valves.
Does anybody know for sure if having 2.02 valves installed will increase the performance or is it best to just leave them be?

 

[70aarcuda]

the 308 heads were the swirl port heads for 360...started in 1989 with the LA 360 roller cam engines...

if you have bowl work done on the heads while installing the larger valve ...you will see pretty performance...if your heads have multiple valve jobs and the valves are sunk...installing a larger valve to get the valve back where it is suppose to be...you will see pretty performance...