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Discussion Starter · #1 ·
I have a 66 Malibu w/69 396SS motor built to 500hp with steel crank and 12-1 compression. I have put 93 octane with two bottles of 104 octane boost and still it is not enough. I then have to buy B-32 racing fuel and add 5 gallons. At $40 per 5 Gal.
it is too costly. Any suggestions? I may have to pull the BB out and drop in a SB to run on streets for fun. Anyone looking for a 69SS 396 Coded JK
???


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1966 ChevelleSS LS-7/4spd
1966 Malibu 396/4spd
1971 RS Camaro 396/4spd
 

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The discussions I've seen, backed by research, indicate the octane boosters to be very mild in their effect on octane. In other words, a prescribed dose of the "104 Octane" booster in 93 octane gas actually yields something on the order of 93.4 octane. You might nose around your area for a friendly flight services operation who will sell you some aviation fuel. That ought to handle your needs. Be aware that they won't let you back your car up to the pump - you'll need to bring your own containers.

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Phil
"I don't believe I'da told that"
 

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Not sure what kind of racing fuel you are buying but the 110 octane leaded stuff in Ohio is $3.14 per gallon and is sold by a gas station fairly close to Norwalk Drag Raceway (kind of on the way to the strip from the eastern part of Ohio and they were smart because they sell it cheaper then at the track)

I think at 12:1 as a minimum you would need to run 50/50 blend of this 110 with your 93 octane unleaded if you can get it. My friend has a 12.5:1 motor and he runs 100% 110. Like the post above said, the octane boosts may be OK if you are in a borderline situation but not if you need to get that Octane raised signifcantly and at 12:1 I think 93 is probably a few points low

I have a 11:1 302 motor in my Z/28 and it ran OK on 94 octane but was borderline according to the engine builder. He said "do not run anything less than 94". I now run 94 with about a 1/3rd racing fuel to be on the safe side and she purrs like a roaring Lion


I know this doesn't help but you need to find a source of reasonably priced racing fuel and by a bunch of containers and stock up and determine what blend works best for your motor

Good Luck

Mytmouse


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67 SS396 350HP 4 sp 3:55 Posi Butternut Yellow w/Black Vinyl
68 RS Z/28 302 350+Hp? 4sp 4:10 Posi, Euro Red on Black
70 SS396 350HP 4 sp 3:55 Posi, Black on Black

Mytmouse A.K.A. Robert Stacho
ACES Member # 04359
 

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i know a guy that has a 78 trans-am. he runs a HP BBC. 12.5:1. He simply takes a 55 gallon drum, put's 45 gallons of 93 in it. then he heads over to the local airport, fills up the rest with airplane feul. He say's by the time he drives home, everything is mixed together good. And most important the car purrs.
 

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It's funny that this topic came up. I was in wal-mart the other day and started reading the label of octane boost 104. It said, and I quote "this product lowers harmful deposits thus lowering the need for higher octane".

I almost fell back laughing. I have bought this stuff in the past thinking I was raising the octane but the results always left me unsatisfied. Now I know why.


RLK

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70SS LS6 coupe
71SS LS5 elk
72SS LS5 convertible
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The marketer's are good...will raise your octane 4 to 8 points...so people are thinking it will raise 92 octane to 96-100 octane...wrong, more like it'll barely raise it to 92.5-93...slick

"The fine print is the product's warning"


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I work to live, but make money for fun...when am I gonna start having fun?

John's '71 Malibu 383
 

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Along with Jim's idea-how thick are your head gaskets? I understand running "thick" gaskets can reduce your C/R by a few tenths, which may help you some-and aren't that expensive.

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71 Ragtop, finally under reconstruction!
MCC #347, TC (Gold) #174
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I guess lowering the compression would be the most logical thing to do. I run 89 octane pump gas in my daily driver 67 Nova with 9.5:1 compression. It actually e.t.'s better on the lower octane gas.

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67 Nova 3475# daily driver
9.5:1 385, 700R4, 228° Erson cam, RPM and a Q-jet - 12.1 @ 112 on 89 Octane
64 Chevelle Road Racer in the works
67 Nova Wagon under construction
 

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B32 is overkill...run plain jane Cam 2 and mix it 50/50. Cam 2 is 110 octane and can be bought for usually no more than 4 dollars a gallon...usually less than that.

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Bill
65 SS
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The only octane boost I have found that works in my Camaro (10.5:1) is from VP racing fuels. I can get about a tank and a half out of each $10 bottle. I buy it through Autozone.

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Jeff Angerstein
ACES#841 TCG#158
68 SS396(454)
68 Pro Street
69 SSRS 396(427) 4spd
87 MC SS

My Chevs
My Favorite
There are two theories to arguing with women.... Neither one works!
 

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I belive this link is still good, it's everything you ever wanted to know about pump gas,racing fuel, misconceptions about octane boosters, and best of all, how to blend your own without spending all that money for race fuels, it about 10 pages long,worth reading and printing out, http://www.wauknet.com/douthitt/pumpgas.htm

Rocky Hill

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A Man And His Chevelle!
It's A Beautiful Thing.

My66SS
 

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Discussion Starter · #13 ·
Great info everyone! Thanks Rocky for the site. I saved it and will read it when I return from the IOLA Car Show.

Gutz

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1966 ChevelleSS LS-7/4spd
1966 Malibu 396/4spd
1971 RS Camaro 396/4spd
 

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I have been experimenting with a TEL octane boost called Lead Supreme 130. I'm running 11.25:1 cr and never had any luck with boosters in the past. 2 bottles of the black 104 stuff to a tankful of 93 and I still had ping. I bought a gallon of this LS130 and have been slowly upping the ratio. Right now I'm running 16oz to a tankful. Ping has virtually disappeared. A 16oz batch adds about $6.25 to the cost of a tankful. I'm still experimenting but so far so good.
http://www.batterystuff.com/fuel/lead_supreme130/lead_supreme130.htm

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Mark
1970 SS454 LS6 (nom)
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"Those who would sacrifice their freedom to achieve a measure of 'safety' deserve neither freedom nor safety."
 
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