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  Can I get away with running 94 octane in my 351c?

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Author Topic:   Can I get away with running 94 octane in my 351c?

Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 05-01-2003 11:06 AM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
I went through the search option and I'm still not quite satisfied. I have a 351c with closed chamber heads and flat tops (around 10.5:1). My cam is Crane solid .570/.590 with 246/256 duration @.050
Now, with about 71 degrees overlap should I be able to run on pump gas (94 octane)?
I would like to try it with 32 degrees timing and go up to 36 max. to find out the results. I'm currently running 100 octane with 39 total.

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Posts: 1289
From: Athens,GA
Registered: Jul 2001

posted 05-01-2003 11:17 AM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
Last 351C 4V chassis dyno showed most power at 34 degrees with 93 octane.

Hope this helps

1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph (7.80 @ 92 mph)

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Posts: 57
From: Northfield NH USA
Registered: Jul 2000

posted 05-02-2003 05:44 AM     Click Here to See the Profile for denny   Click Here to Email denny     Edit/Delete Message   Reply w/Quote
I have a very similar speced Cleveland and it made its best power with 34 deg. timing It didn't like 94 octane though.

D French
67 427 Fairlane(A/SA) 73 Mustang 351c

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Posts: 638
From: Connersville, IN
Registered: Jul 2001

posted 05-02-2003 11:42 PM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
My cleveland has closed chamber heads and flat tops. My cam is very close to the one you have. I have calculated the compression at 10.26:1 and I run 93 octain pump gas even when I race. I run 36* advance and have had no signs of detination.
You should be fine.
I have tried racing gas and gained nothing at the track.

Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 351C 4V

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Posts: 84
From: midwest USA
Registered: Dec 2002

posted 05-07-2003 01:19 AM     Click Here to See the Profile for popeye   Click Here to Email popeye     Edit/Delete Message   Reply w/Quote
70coupe have you ever tried 104 super octane booster? We used it with 93 oc.Ammoco with very good results.With no octane booster it pinged like crazy,alot cheaper than race fuel too.popeye

This is FORD COUNTRY, where on a quiet night, you can here a chevy rusting

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