These heads have been running on this car since I’ve had it. Outfitted with Stage 1 springs and everything else is stock. These heads brought my 4515 lb Riviera to 14.02 @ 98.49 with a DA of 2000’ on top of my mildly cammed 430. As previously mentioned by another member, these heads are very clean and could theoretically be bolted on and run. Do they have value? http://www.buicks.net/shop/reference/bigblock_casting_numbers.html
In that year they had the big ports heads,if those are it they should be worth $200.00 maybe $300.00 ,as I am looking at fairly clean heads.Then there's the problem with 67 heads,on most of them there's cracks.Bruno
If I was looking to buy I would be more interested in them being crack free than having had a valve job. They go between the spring seats.
No valve job,as I look at them and they don't look like S-I valves,actually I'm pretty sure they are regular stock valves,so in putting S-I valves,a valve job is mandatory,then 2 people will be paying twice for the same thing.Just my opinion.Bruno.
The cracks in my big port heads were under the valve cover and did not hurt anything. Put lots of hard and fast miles on them. Any Buick heads getting a valve job should only be done by someone who has the very best equipment. A few minutes with the old stones can completely destroy a good set of heads. They should be done with forming tools only and carefully measured. Once done, you can put a level across all the valve stems full length, and see what you have. I've seen as much as 1/16 inch difference in stem heights. That,s really sad.
Stem Height... Thats when a BoZo grinds the valve seat deeeeeeeeeep... That makes the stem taller.. Need shims under valve springs.. maybe corrected by shortening the the stem,,, Totally messes up a good set of heads.. Maybe fixed by new seats. Its Just a Bad Thing..
Yes, fresh valve job, disaster! Once some valves are sunk, you must sink them all the same, then you must raise the rocker arm shaft with shims to correct rocker arm geometry. I bet a survey of what's out there would be surprising. Adjustable rocker arms and/or push rods cannot fix this problem.
I had a set of 430 big port head done, shop replaced all the exhaust seats, then in less than 100 miles seats fell out and the blamed me for over heating the heads..........the coolabt never saw 200, they refused to fix and threaten to call the cops if I didnt leave. I still have then in Hope's of maybe someday they might be able to fixed. But I bet it cost way too much
As a guy who has done some valve jobs it is normal to grind the stem to set the height. There is quite a bit that sticks up above the retainer.
Rocker arm geometry needs to be correct! Shimming the valve springs would correct the pressure requirements, but that's all. Grinding down the stems on a Buick engine is minimal. We ( me and my wheel standing Buick racing buddy) couldn't fix the problem on my heads. The rocker arm geometry must be corrected and shimming the shaft is crazy. The shim creates a smaller radius in the pedestal saddle and the shaft will sit on the edges of the shims since the pedestal radius is now smaller than the shaft. I had to do this...or throw away a well ported set of big port heads. Finally, after a few years running the crazy shaft shims, I bought TA heads and threw the nicely ported 67 big port heads away. A valve job gone wrong can turn your dream into a nightmare.
Grinding the stems won't change the spring pressure.. it should correct the valvetrain geometry and is, at least ought to be, standard procedure for any valve job.. of course there is only so much that can be removed. It won't compensate for valves that are completely sunk. I'm also a wheel standing buick driver/builder!
Not a machinist but I thought at minus however much you cut off the valve face had to come off the stems right up front. I thought the old stones were better about not sinking a valve as much as the new cutters........but the issue with the stones was having trouble keeping the cuts from getting wide
Valve seats should be cut with steel forming tools and a dial indicator, not the old spinning stones. The exact amount of cut is controlled and yes a few thousandths off the stem can keep everything within tolerance. Before you pay for anything, put a straight edge along all the valves, and look for excessive spring shims. You can also spray a little carb cleaner in the ports and see if the valves leak.
