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Racing fuel or pump gas?
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johnyrb2002
I love my Chevy Chevette!
| Posts: 18
| Joined: 05/09
Posted: 06/02/09
06:33 PM
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I have an issue. I have two people telling me two different things. I have a 350 bored +.0402, 9.35:1 pistons (with 64cc chamber heads) 5.00cc piston top volume, deck height is .018, stroke is 3.480, gasket is .044 compressed. My heads are 56cc, 1.94/1.50, Z28 springs, harland sharp 1.6 roller rockers. Anyhow I used a c/r calculator and it says I will have 10.87:1 c/r. One person says I will HAVE to run racing fuel, and the other says I only have to use premium and may have to retard the timing. Please help...Which is true if either? Any help is greatly appreciated...Thank you. 
Drive it like you stole it.
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Pontiacman2
Everything in my driveway’s a Chevy
| Posts: 670
| Joined: 01/08
Posted: 06/03/09
09:25 AM
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If the heads are 56cc for sure list the casting numbers then yes you will need some hi-octane 104 fuel. Retarding the timing to stop detonation is just putting a band aid on it and taking the chance of ruining your engine.
Professional hi-performance engine builder
Horsepower sells Engines and torque wins races.
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johnyrb2002
I love my Chevy Chevette!
| Posts: 18
| Joined: 05/09
Posted: 06/03/09
11:03 AM
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casting number is 601. Is there an octane boost that could bring it up to 104? I also heard that at the elevation I'm at I may not even need to retard the timing. Elevation 3000.
Drive it like you stole it.
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Pontiacman2
Everything in my driveway’s a Chevy
| Posts: 670
| Joined: 01/08
Posted: 06/03/09
11:59 AM
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The 601 heads are 58cc and have to have the combustion chamber opened up a little bigger for the 1.94 intake valves.
With a 58cc head you have a 10.57:1CR. 
Professional hi-performance engine builder
Horsepower sells Engines and torque wins races.
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johnyrb2002
I love my Chevy Chevette!
| Posts: 18
| Joined: 05/09
Posted: 06/03/09
01:09 PM
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I measured the chambers and they are 56cc. The 601's are anywhere from 52-58cc's.
Drive it like you stole it.
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johnyrb2002
I love my Chevy Chevette!
| Posts: 18
| Joined: 05/09
Posted: 06/03/09
01:11 PM
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At the elevation I'm at what would the highest compression ratio that I could run pump gas and maybe some octane boost be? I was also told that if I get a good ignition system I would be ok.
Drive it like you stole it.
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85_trans_am
My first time was in a Chevy
| Posts: 240
| Joined: 05/09
Posted: 06/04/09
03:54 PM
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I'm not to familyar with the 601 heads. But my question is, are they iron or aluminum.
With iron heads your limit is about 10.2:1 with a octain boster.. Aluminum heads your limit is about 11.3, 11.4:1 with a octain boster.
To help out you can put a shine on the pistons and combustion. that will get rid of hot spots, or get them done in a ceramic finish.
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Pontiacman2
Everything in my driveway’s a Chevy
| Posts: 670
| Joined: 01/08
Posted: 06/04/09
04:45 PM
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601's are 305HO iron heads and he will need to run race fuel for any thing over 10.5:1CR
Professional hi-performance engine builder
Horsepower sells Engines and torque wins races.
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