Corvair Forum

Since the heads I installed were rebuilt the gasket surfaces were machined. To compensate I use the 1/2 instead of factory 1 turn after zero lash. If shorter pushrods are used, which are shorter than stock by the amount the heads have been surfaced, you can use the full factory lifter preload. This...

While removing the rocker bolts from the studs to access the little o rings, one of the studs un-threaded (cleanly) from the case instead of the rocker nut coming loose. No panic involved. It all looked super clean. Problem is, I can only get it threaded in so far (about four threads shy of bottome...

I did not think a vendor would put used parts in a GM box and pass them off as NOS. It was not a lot of money, it is more the principle. Maybe the vendor will see this, recognize the box, and give me a refund. Two times I have purchased a bunch of Corvair parts at a garage sale type event. Private ...

AFAIK, all the OTTO cams are slightly different than they were priorr to clarks buyout, but don't quote me. Here's the current specs on the TB10 and TB20 There is something very wrong with the TB 20 exhaust numbers. They can not be the same as the TB 10 while having more listed duration. The exhaus...

zarfnober wrote: ↑Wed Apr 17, 2024 7:12 am AFAIK, all the OTTO cams are slightly different than they were priorr to clarks buyout, but don't quote me. Here's the current specs on the TB10 and TB20

There is something very wrong with the TB 20 exhaust numbers. They can not be the same as the TB 10 while having more listed duration.

Some high output high performance ignition coils have a very low primary resistance. It may almost look like it reads zero ohms if you don't check it carefully. The standard Delco coil has a 1.42 ohm Primary resistance. Most aftermarket coils have either 1.5 ohm or 3.0 ohms Primary resistance. Meas...

Now that's interesting. When I go California Corvairs the $85 Hastings rings description is cast piston rings. Is it only their moly rings that are ductile? Not sure if Hastings chrome rings are ductile iron or cast iron, but if I think they are ductile. Quick test with an old Hastings chrome ring:...

Clark's only has plain cast iron rings by Grant. They sell Hastings "plated" cast iron with either chrome and moly. Hastings moly rings are ductile iron, not cast iron. The moly is applied to the ring by plasma deposition. The plain Hastings rings are cast iron. Not sure if Hastings chrom...

While we're at it, Clarks catalog seems to imply that moly rings can be more difficult to break in than chrome. From what I read chrome can be the most difficult. I sure would like to see more opinions. Moly rings break in as fast as a cast iron ring. Chrome can take miles and miles before they bre...

The IROC an Z28 wheels I've had were factory color accented in all kinds of color; yellow, gold, charcoal, black, teal. These hues are not available in anodize processes. Do I need some edumacation? Edumacation: The color in the anodize process is a dye and pretty much any color could be done to th...

Yes a few years ago shippers raised the rates on "big and bulky" items. All shippers have what is called "dimensional weight" to price what they will charge the shipper to ship the package. Think of it as the cost of the space on the truck. A 34x17x15 box of packing peanuts that...

The DELCO distributor is a good design and the only "bearing" is a bushing. Usually good for 50,000 to 100,000 miles. Depends on maintenance and abuse. DO NOT install double bushings. This was a MISTAKEN idea that the little shaft end play was BAD. Distributor shaft end play is BAD, if ou...

Keep in mind the 140HP engines used a heavier pressure plate (more cast iron mass). 140HP and 180HP engines used a heavier pressure plate. The heavier pressure plate was made from a higher quality material than the other pressure plates. This cast material is more resistant to cracking due to exces...

Detonation is an explosive burn instead of smooth burn and makes a sharp metallic noise. Pre-ignition is when the timing is so advanced the combustion happens too far before TDC creating a very high compression pressure. It is usually silent (water cooled enigines) and will eventually put a hole in...

Fast bought the unit from Crane, now some offshore company bought Fast. Fast is not offshore. The company, Fast, which manufactures the XR-700 is under the umbrella of Edlebrock Group companies. Other companies under this umbrella are Comp Cams, TCI, Russell and Lunati. In 2020 Industrial Opportuni...

Ken Hand has built 10:1 engines that run on pump gas without detonation. In one example, an engine had 0.042" total deck and a Singh groove, the heads had to be removed to reduce the compression ratio to resolve the occurrence of detonation. This engine is fuel injection and has electronic tim...