Quote:
Originally Posted by garry viohl
482 FE with aluminum heads and 35 total timing.
Do you think it will ping? What happens if the air temp goes to 100?
Thanks.
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The simple answer is that it depends on a lot more than if the heads are aluminum and how much timing you have in the engine.
Some other things it depends on:
1. Camshaft
2. How close the pistons are to zero deck (quench distance)
3. If the pistons have been hand-worked to remove all sharp edges
4. Chamber design
5. Cam timing
There are LOTS of variables here.
I have ran a 428 FE with Edelbrock heads at a little over 11:1 with 93 octane. That was with 38 degrees total timing. No issues.
So yes, it can be done if all the parts are working well together. It's a little easier in a lightweight car like a Cobra, especially with lower (numerically higher) rearend ratios.