Brumbach

Grabbed my 5 gal can and went to the AP. No one in the terminal so went out the main hanger. Great bunch of guys working on one a/c engine or another. Inquired about the avgas and the manager took me to the flight line and showed me how to pay and operate the pump. Turns out the price was $4.50 per gal. He gave me the electronic gate code and told me to help myself anytime. The only precaution was must be placed in a container and not directly into a vehicle. What a deal! Not sure what blend ratio I'll use but will clearly be able to avoid E from this day forward. I can get 89 octane w/o ethanol but not premium. So a good blending of the 89 with avgas might be the best. Gonna run straight avgas for a little while just because I can. Thanks

Chuck Gongloff

That's been my experience too.

The local airports want to sell product.. The 5 to 10 gallons they sell to you or to me won't make anyone's radar screen.

Robert61

Almost seems like we may have touched on this before but for those trying to make an informed decision here are a few facts. It's oft repeated here that hardened seats are unnecessary. While you may very well sneak by with heads that have been run a long time with as cast seats if you have a fresh valve job it opens Pandora's box. Fresh ground seats can erode quite quickly. Here are some pics of a forum member that took his Corvette heads in for rebuild. As you can see there is no other option than to install seats in these heads. A machinist that knows what he's doing can and will install the seats without hitting water. If you have 1.600/2.02 that's an entirely different scenario. Due to the thickness between the seats and the fact that these heads were designed for 1.5 exhaust valves it would be very difficult to install them without issue. Previously when I posted these pics it was suggested this might be a bad valve job. This is NOT due to a valve job grinding into the head this is what seat recession looks like. Earlier it was stated GM never installed seats in heads. They installed seats in heads used in heavy duty applications such as 1 tons, vans, buses. They installed seats in the 906 vortex heads in the 90s and in 454s used in duallys and in other cases I would guess. I've asked before, I would love to see a link to ANY machine shop that will rebuild a set of early heads without installing seats AND offer a warranty.

napa68

lmao

cv67

If you run it for the sake of it knock yourself out, most these cars just dont need it nor have the CR claimed.
I run Ca 91 pee on this unless its hot...or I want to add timing and really beat on it .Not quite 12:1 no signs of pre igntion anywhere.

GTOguy

A lot of it depends on combustion chamber shape and the characteristics of a particular engine. My Pontiac GTO engines will not run on 91 octane with stock compression, which is about 10.5:1 (advertised as 10.75) I had to drop the '67 down to 9.3 (still pings on 91 on a hot day) and I use race gas in the '65 (heads were milled and it is a true 11:1). My '61 Corvette with a 383 stroker is about 11:1, and runs fine on 91 octane. Had to play with the distributor advance curve a little, but it's amazing. I'm freshening it up right now, but planning on leaving the compression right where it is. The throttle response is nice an sharp.

SDVette

Compression ratios are calculated statically.. In other words, they don't take valve overlap, flow rate, etc. into consideration.
My LT-1 (11:1) also runs fine on pump 91.