i have herd that in big block engins (s-25) that 30% fuel runs cooler than 20% dose any one know weather this is true or not??

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I have a Savage as well I think the only way to find out, is probably to buy a quart of 20% and a quart of 30% and try them each. and be sure to check ur ead temp. does this sound like it would work or does anyone else have a better solution??? ( me and my friend really need help )

If ya bump up your nitro percentage you might wanna put in another head shim to be safe... Generally if you bump up your percentage+ extra head shim you will notice a temp drop but not a huge one... Keep in mind that it is NOT recomended to bounce back and forth with nitro percentages since the tuning will be all off.. Its not good for a motor. 30% fuel is more expensive then 20% and ya might not really notice that much of a difference to justify the extra cost.... Hope this helps!!

thanks that helps alot

that is true