690 date code ID
- Thread starter Trentsquare
- Start date
Does the other head match this one? Also, just click on the little scenery box next to the smiley face after you post your first picture and keep adding them that way. No sense in adding a link to a photo, mainly because the link might be killed later and no one will see the images after a link has been disabled.
James jones
Well Known Member
I’ve got the same cylinder heads and intake and they were off a 63-409-400 horsepower motor. I believe they were made from 63-65.
What year did the 583's come out?
late 63 into 64 if I remember right.
James jones
Well Known Member
I believe 1965-400 horsepower also.
Trentsquare
Member
Thanks everybody, I have to dig out the other one tomorrow. I figured they were 64 and hade been changed before. The bottom end is all standard. The block stamp # says 340 horse from 65. I was really lucky to find this motor and am thankfull for that. The valves and guides are in really nice shape. The guides are only belled .001 at .373 in the middle and .374 on the ends so they will clean up at .375 to .376 . Im hoping SI valve out in cali makes .003 over stems for stock length 409 valves and they mike out at .375 or bigger. Do yall use positive stem seals? It seems kind of wrong to cut the guide bosses down on heads this nice for the .530 vitons. Maybe the umbrella type. I don’t know if those work. Seems like should have some type so it don’t blow any smoke. Also wonder about needing longer valve stems? The one intake that I checked has 1.735 installed height. I think around 5500 rpm is enough for me. Do you guys think I can keep the valve geometry stock and still have a nice motor? Maybe kind of limited on valve springs and cam lift though.
I would just have the guides machined for a liner and install new stainless valves.
Trentsquare
Member
you are probably right. They have been running stainless on bronze for a long time. The SI valves are stainless. Probably a
coin toss on using stainless on bronze vs on cast iron. Especially with the black nitrate coating. Do you think I should get
stock length stems?
coin toss on using stainless on bronze vs on cast iron. Especially with the black nitrate coating. Do you think I should get
stock length stems?
If you can with the cam you pick it would be better to stay stock length as that will make rocker arm geometry work out best.
Like LA said, put bronze liners in and use stock replacement stainless valves. Hard exhaust seats would be in order also, for a driver. The positive seals would not be necessary if the new valves are 2 groove made for OE style o-rings and you keep the stock retainers & oil shields. If a different retainer becomes necessary positive seals may be your only option.
Jeff
Jeff
Trentsquare
Member
you guys were right, it’s bronze liners. SI don’t do oversized stem options anymore. The guy said those days are long gone. Kind of sad, I think I miss the old days. At least a real person answered the phone
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James jones
Well Known Member
Here is a picture of the intake that goes with the 690 heads off a 63-409-400 horsepower motor:
