While I'm thinking of it too... what does the manual call for concering minimum octane rating? 89 with a 305 TBI

PDJ

 

probably 87, though I always pay the extra $2 per tank to get 93.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei
'95 3.23 rearend
hotchkis rear suspension

 

you guys have 93 out there? We are down to 91 for premium around here . grrrr...

 

i always run sunoco ultra94 and i get way better gas mileage then with 87

 

What does the owners manual actually call for? That is what I am looking for.. since I dont have the manual for my rs.
Thnx again

PDJ

 

87 is what is recommended by GM. Yup, regular gas.

I found that running higher octane gas was not cost effective for me, the mileage increase did not offset the additional cost of the gas. (This is my daily driver) I did like the way it ran better with the high octane gas, but, don't wanna spend that kinda scratch just to drive to work and back....

 

I only use 93, there is only 1 damn gas station around here that I know of that has it, everyone else has 91, and its more expensive!!

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, LPE High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

 

I can get 94 real close to work, and home. If I want to drive 15 miles I can get 100 at the pump. It is in a town with a population of 2, but they have tractor pulls, and mud racing a lot there.(all legal) And some of guys around here need it, so they do sell a lot.



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Joshua Johnston
1991 Z-28
Flowmaster
K&N
305 / 5spd. (Temporary)
Soon to have:
350, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust, T&R Motorsports custom air intake