What to use for Octane boost. Your thoughts?
I sure hope this is the correct place to post this. If not let me know.
My question is, what do you guys use for an octane boost for your weekend jeeps. I'm putting out at tad over 400 HP (on the engine dyno during cam break-in)from my 360. I was gonna build a street rod, but I had my High School CJ7 in my barn since late 99 when the frame rotted out. It has an AJ's Kevlar/Glass body & 1piece Kentrol front that tilts either way. It needed a frame, so this is a nut & bolt resto from a late '86 WT frame (hence the D-44). My 4' Roughest country lift turned out to be closer to 6"s & called for the 35's to get the proportion back. My 33 looked like donut spares!
1)10.75 Bulltear forged, pop-up pistons
2)40+ hours of porting & port mating the Pacesetter headers, and Edelbrock Air gap w/670 Holley Truck Avenger
2.5) Pacestter headers are 1-5/8 tubes into 3" collector. Planning on 2.5 pipes into 3" Flowmonster turbo style mufflers, & 2.5's out the back corner. Open headers for now, but advice on that is welcome as well..
4) Comp 292 (Hydra, 2500-6500 RANGE, Duration=292, 244@.050,518 LIFT, SEPERATION=110, CENTERLINE106, p/n 10-210-4)
roller lifters & rockers
5) Stock bore & deck
6 Forged bottom end, wish I had the coin for a bigger oil pan at this time.
7 T-18 (6.32 granny low for off road use)
8) D-44, 4.10 w/Tru-Trac & 35 BFG a/T's
SOooo, my question is this. What do you guys use to prevent Pre-ignition. I'm at about 1500-2k feet above the sea.
I've been told to use 93 octane, cheap gas+ octane booster (Nobody gave me a brand!) or AV gas, which I have access to, but the price I imagine is astronomical!).
SO, what do you all do? I don't want to back the timing off, or add 6" head gaskets to lose all the power I tried so hard to make.
Basically it's a street machine that I trail ride & hit mud with! Even w/the stock 304 & 2.5" Rancho lift I could put the speedo into the fuel gauge. I've only driven it 1 mile & w/open headers couldn't hear detonation if it was a hand genade!
It will stand straight up w/the x-case in low & the hubs unlocked, so a Tatton's shaft is on the way!
I'm open to all suggestions and critisisms
Thanks in advance for any help.
I've also learned that sometimes... when people don't agree with you .... its best to hold them down and kidney punch them till they agree with you
Last edited by hutch1200; 06-11-2015 at 04:02 PM..