Corvair Forum

Lovin the “Licenced by NASCAR”


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Maybe someone has disassembled a stock ‘66 or ‘67 140 and noted what GM# the 9891 cam that was in it?


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After reading Bob Helt’s The Classic Corvair, I’m wondering if there’s a way to tell which of the 9891 cams got the updated ramp profiles to be more like the 2304 cams. I have several 9891 cams but they vary with their GM stamp wildly. I have some stamped GM 3 all the way to GM 17. I assume the smal...

Project update... cleaned the XXA case and prepped it according to Bob Helt’s guidelines. Got the ‘65 110 heads back from the machine shop. Have an Otto 10 cam with new Cal Corvairs gear & lifters ready to go. The machine shop pressed new .030 cast pistons onto machined LM rods and matched them ...

66vairguy wrote:Thanks for posting update. Glad it went well.

Sometimes folks get advice for a problem and never respond with what worked to help others.

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Hopefully they did not machine the end of the crank to get that in there. If it had a larger diameter than the old pilot bushing they may have had to machine the opening larger. It shouldn't bother your automatic build, but it would have to be considered for a manual build. You’re right. TG it’s go...

Being's as there is a small seal on either side of the rollers, I'd be surprised if the bread trick didn't work. Regardless of seal condition. Tried the bread and didn’t work. Started squishing out of the top seal ring. Going to get a puller and try that. Soaking it in PB Blaster until then to hope...

Hi everyone I got my first corvair a few months ago and it’s pretty straight, anyway I’m new here so I guess this is a nice way to introduce myself. So I tried firing the 62’ and noticed I wasn’t getting gas to the carbs then I went down to the fuel filter and noticed there no gas getting there eit...

I’ve checked all the pullers I have and none will fit in the hole :/


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I have never seen one like that. I also suspect it is some kind of pilot bearing. Could be Corvair or could even be for some transplant application. Apparently rarely seen/used according to my club contacts - and I can see why. 66vairguy makes some solid points! Thanks Sent from my iPhone using Cor...

Ted must be working or he'd post. I suspect that is a roller pilot bearing. Some have tried them and most modern cars use them. HOWEVER - if they fail they almost always damage the crank and input shaft surfaces, possibly to the point of making them unusable!! Roller pilot bearings usually do not g...

Looking at some cranks I have for the 110 build and one has these gears? teeth? In the end. It looks like it’s part of the crank but could just be rusted at the end so it looks like 1 piece. Doesn’t match up to the teeth in the output shaft for a PG so not sure... I’ve only ever done 4spds before wi...

Agree with joelsplace. Sounds like input shaft bushing! Since you’ll have it down I’d replace the throw out bearing anyway along with the shaft bushing. Replace the shaft seal(s) in the diff snout, open the side cover on the 4spd so you can see inside and rotate the input shaft and listen to the nee...

terribleted wrote:That thickness of the step is about right. I just measure some on a 140 head the other day that I am sure has not been cut and saw .056-.057 or so.

[emoji1360]


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Ted had good comments. Detonation usually doesn't affect seats, it damages pistons. The large valve 140HP heads have more problems with dropped seats vs. the other Corvair engines. Any Corvair engine that is overheated will probably drop a valve seat. Also over revving the engine with stock valve s...

OK so 91 octane unleaded ethanol mixed fuel is the best you can get? That would be a fine choice in the 110 I described especially if adding .010-.020 head gasket thickness. Here it is rated at 92. If you must run 87 then the 95 heads would be a better choice. Stay small in overbore and stock in ca...