KT67

Any suggestions for the best type of fuel to run in a 67 big block?

vetsvette2002

Pemium, 93 rating (r+m/2).

I use this in my 67 327-350hp with the original 11:1 compression. With no pinging either.

Don

Joel 67

Which engine? 390/400 hp or 435? With the 435, you may need to adjust your timing map to be able to run this on premium without any racing gas added in.

david srour

On my 427/400 w/ 10:1, I run 36 degrees total timing. It runs fine on high test pump gas. See articles by Lars in FAQ's on timing, advance curves, and vacuum source.
http://lbfun.com/Corvette/Tech/vette..._explained.pdf

gscott

I run hi test along with 5 gal racing fuel, car really likes it and it also smells good !
Gary

LT1driver

435 here....premium shell at about 91-92 octane is all I get and it works

bb62

Though I typically try to get the 93 ocatane, my 435 does just fine on unleaded premium.

Cobra66

For several years, I've been running 93 octane in one of my other cars, a big block from a competing car manufacturer, and I only get an occasional, very small bit of run-on when shutting down the old side-oiler.

I don't recall the compression ratio, but when the engine was rebuilt in the early '90's, it pulled somewhere north of 485 HP just before reinstallation.

I used to mix 110 octane, leaded CAM II with pump gas for this engine back in the '80's, but since my source "dried up" in about 1990, I've just relied on 93 unleaded since with satisfactory results.

If I could again find a convenient source for CAM II leaded, I might add a few gallons now and then, if only to get a bit of lead.

oldschoolvette

91-93 is fine..enjoy the car

KT67

Thanks for all of the input. I've been running 94 in it lately, but someone told me about a fuel called Turbo Blue. Has anyone heard of this or tried it? It is a 435.

Joel 67

I assume you are talking about the Turbo Blue unleaded? It is basically 100 octane unleaded gasoline. Nothing special or magical about it beyond that. I do not think you need it in a regular 427/435 car unless you have the ignition map all jacked up. Even if it is jacked, you would not need more than 3-4 gallons of 100 octane splashed in with your regular premium gasoline. But as I said, you should not need it if everything is dialed in right.