Re: Fuel mix for my 69 Camaro L78
 

Will using fuel or additives with lead negatively effect a motor with hardened seats?

Re: Fuel mix for my 69 Camaro L78
 

Rob, gumout carb cleaner will take the blue out of the intake.

Re: Fuel mix for my 69 Camaro L78
 

I always run Cam II Blue which is 112 octane and is leaded. I then tune the car the old fashioned way and set the timing with a vacuum gauge , set the timing to get the most advance just before detonation even the most expensive timing light won't compensate for the ravages of time on the rubber on an old balancer, and then procede to adjust the mixtures screws to maximize vacuum. Always works for me, especially when tuning cars with original or even NOS balancers they tend to slip and the timing mark becomes inaccurate.

Re: Fuel mix for my 69 Camaro L78
 

I run straight 100 octane turbo blue in my '70 Chevelle, w/o any problems. Original ls6 motor is gone,in place is a 396 bored .30 over, 11.5:1 compression,comp cams magnum 280 cam,stock ls6 intake/carb/exhaust manifolds,timing is 38 total,never over heats,but will ping if I try to mix the turbo blue 50/50 with 93.I dont know how some of you guys with stock high compression motors run 93 w/o any pinging unless you are really retarding the timing or your true compression is less than what it is reported to be.

Re: Fuel mix for my 69 Camaro L78
 

There is often a wide variation in chamber volume on some of the high performance cylinder heads. It is not unusual for the actual compression to be closer to 10.25-10.50 than 11.00-1. I have "several" L78 cars and there is a differnt fuel tolerance for each one. The only way to know for sure is to pull the heads and measure CC's and dome volume and then figure the static compression ratio. It is a lot easier just to set them up to run and back into a fuel mix that works without detonation.

wilma https://www.yenko.net/ubbthreads/imag...ns/burnout.gif

Re: Fuel mix for my 69 Camaro L78
 

I cc'ed a set of L72 pistons, and they averaged around 29cc, where they were *supposed* to be a 34cc dome, and the head chambers cc'ed at around 112-113cc where they're supposed to be in the 107-108cc range...this netted a compression ratio of 10.2:1...

Re: Fuel mix for my 69 Camaro L78
 

Are you fellas able to get race gas locally without going to the track---S&K in L.I.--seems to be the closest to where I am and you can have it del---UPS------------

Re: Fuel mix for my 69 Camaro L78
 

I have to buy 55 gallon barrels...kind of spooky driving down the road with a barrel of 112 behind your ear ...

Re: Fuel mix for my 69 Camaro L78
 

Its even more fun taking those 55 gallon drum off the truck by yourself.

Re: Fuel mix for my 69 Camaro L78
 

[ QUOTE ]
I have to buy 55 gallon barrels...kind of spooky driving down the road with a barrel of 112 behind your ear ...

[/ QUOTE ]

Bob.. you are supposed to unload that when you get home with it.. Not drive it around all week to show it off. https://www.yenko.net/ubbthreads/images/graemlins/no.gif