can anyone tell me about a set of 1973 902 heads?

[DoubleDlover]

Like maybe if they are as good as 906's? or no. Pluses minuses?? thanks r

[firefighter3931]

Like maybe if they are as good as 906's? or no. Pluses minuses?? thanks r

The 902 casting heads are very similar to the 452 castings. They respond well to minor bowl porting. The 902's also have hardened exhaust seats which is a bonus with unleaded fuel. 


Ron

[DoubleDlover]

hi. thanks for the response. They are dated 73. Do you happen to know if all 902's have the harden seats? someone told me the early ones did not??/ thanks ron

[heyoldguy]

As reported the 902 are very much like the 452 and do respond to the bowl work. Of all the big block Mopar iron heads the 902 is the one that I have experienced a cracking issue. For some reason the 902 factory hardened seats are very often cracked. Some 40% of my 902 heads have been cracked through the induction hardening. If not cracked too far you can machine out the induction hardening and install an aftermarket hard seat. If possible, I would bypass the 902 and use the 452 simply because of the exhaust seat issue.

[DoubleDlover]

well darn I had already bought them over the weekend. So I guess im stuck with that problem now.. r

[chargerbr549]

I second that on the 902 castings it seems that several ones that I had run across over the years were cracked also.

[DoubleDlover]

So where and how do I look for these cracks? r

[Cooter]

Take to machine shop and have em look close at exhaust seat area.

[firefighter3931]

As Cooter said ; have the machine shop magnaflux the heads and pressure test them 


Ron