340 Heads intake valves

[billbob1936]

Hello. Calling in engine folks to help identify if these heads have 1.88 or 2.02 intake valves? Also, do these heads appear too far gone with the rust on them?

 

[floyd]

Those appear to be the bigger valves IMO. Always tough to judge the severity of rust from photos but they look like they might be salvageable to me. Also look to have a set of 273 adjustable rockers. Good luck

 

[floyd]

Here’s a pic of a head with 1.88 intake valves. Note the space between intake and exhaust valve.

 

[Chryco Psycho]

I believe they will clean up ok , I would put in hardened seat on the exhaust side .

 

[pschlosser]

the valves where they mate with the seat, they are, more or less, protected from exposure to air and moisture, and may prove to be sound and usable. the rest can be cleaned up, so I see no evidence by those photos, there is damage beyond repair.

 

[billbob1936]

Thanks for the input folks. I have to drive about 3 hours on friday to meet with the seller. Not sure if I'll be able to open the valves to see if the chambers have any degradation. Also, unfortunately, the rockers are not included in the sale, but what kind of offer would be fair for those kind of rockers?

 

[pschlosser]

i would not want those rockers. if you want to inspect all the seats, the only way I can think of is buying and bringing a compressor tool, so you can remove the valve springs on each of the 16 valves, dropping them for inspection. if the seller isn't doing this for you, make him wait while you do it, it may take an hour to do so. the heads are not that well cared for, so don't over pay for these SB "J" heads.

 

[pschlosser]

those DO look like 1.88 and 2.02 heads, as the valves are nearly touching. the more common 1.88 and 1.60 valves have a clear gap between the valves.

 

[billbob1936]

Thanks. It's getter harder to find good 2.02 J heads. I'll make the request for spring removal before making that long drive. I'd hate to do it for nothing.

 

[pschlosser]

they look rough. I vote $300 with the rockers, $200 or less without.

 

[moparlee]

i would not want those rockers. if you want to inspect all the seats, the only way I can think of is buying and bringing a compressor tool, so you can remove the valve springs on each of the 16 valves, dropping them for inspection. if the seller isn't doing this for you, make him wait while you do it, it may take an hour to do so. the heads are not that well cared for, so don't over pay for these SB "J" heads.

Was wondering why you would say no to those adjustable rockers?

 

[Xcudame]

They are 70 or 72 "U" heads used on 340s and have 2.02" intakes and 1.60" exhausts (double verified by @floyd picture). worst case they need a little surfacing, but that will compensate for the thicker Felpro composite gasket. Also long as the rocker tips that contact the valve steams are not worn, no reason you can't those rocker arms!

Definitely need the harden seats!

 

[billbob1936]

What year did they start coming from the factory with hardened valve seats? And was this for both intake and exhaust?

 

[pschlosser]

What year did they start coming from the factory with hardened valve seats? And was this for both intake and exhaust?

I think 72 and later, the year they released "unleaded fuel"

 

[Xcudame]

The small block heads with harden seats were 3671587. All the "J", "U" and "O" heads didn't have harden seats.