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post #1 of 2 (permalink) Old 09-01-2009, 07:41 PM Thread Starter
 
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? Timing On 428

OK I have a 1968 gto 428. It has 11.2:1 Mid Street cam 46 428 heads 750 edelbrock carb malory dist Newly Rebuilt.
What Should I set the timing to at 4,226ft And idle?

Speed Demon All The Way
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post #2 of 2 (permalink) Old 09-02-2009, 12:17 PM
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With your compression, you'll need 100 octane fuel, more likely 102 or higher. Base timing should be about 6 to 8 degrees BTDC. Idle in nuetral should be about 1000 rpm, maybe a shade less. If you're running 92 octane, you'll need to run your timing about 10-15 degrees retarded---about 5-10 degrees ATDC or maybe TDC (0 degrees), and it'll be a dog.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance

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