It all depends on how the engine is set up. Running regular in a big block I would not recommend. If plus works without pinging in your engine fine. I personally use premium in my 396/375. Either plus or premium should get you better mileage too. gm66 --- [EMAIL PROTECTED] wrote:
From: "Dale" <[EMAIL PROTECTED]> To: "'The Chevelle Mailing List'" <[email protected]> Subject: Re: [Chevelle-list] octane Date: Mon, 27 Mar 2006 16:27:44 -0600 My 396 +.060 w/10.25:1 ran fine on 83/85 both with Holley carb/Edelbrock intake and with Accel fuel injection. Never experienced any pinging problems. Dale McIntosh 67 El Camino 1967 Chevelle Reference CD http://www.chevellecd.com ACES #1709/TC Gold #92 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Nasta Sent: Monday, March 27, 2006 9:18 AM To: The Chevelle Mailing List Subject: [Chevelle-list] octane At what point do you guys go from running regular to mid-grade to premium gas? My Olds had 10.5:1 compression and I was told to always run Premium, and I always did. I am looking at a 9.1:1 350 for my Malibu and am wondering if that would require mid-grade or even premium to run nicely. Any guesstimates as to what sort of HP I could get out of that with a decent aluminum intake and 600cfm carb would be interesting to hear too. I have no idea what cam is in it, whether it has been bored, what's been done to the heads, etc. I'm waiting for more info from the seller. Just putting feelers out in the meantime. Thanks _____________________________________________________________ Netscape. Just the Net You Need.
