How much compression can I get on a L98 and still use 89 octain gas. I know stock you are able to run 87 but for 89 how much compression and for 93 what are we looking at?

 

lot of varables involved to say 89 is good for x.y:1 compression and 93 is good for y.x:1 compression. aluminum heads disapate heat a lot better than iron and allow for more compression with out ping. you'd pretty much be splitting hairs trying to built and engine to run on 89 but not 87.

------------------
ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

 

There is little benefit in using a higher octane fuel than you need. After finding the correct octane, any more is just an unnecessary expense.



------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

I saw that gas station sign on the Fox News Channel, its pretty damn accurate....

------------------
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, Edelbrock TES 1 5/8" Headers, Catco 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 (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

Soon to Come: 7.625" 10 Bolt with 3.42s and Accel TPI Intake Base