Raising the Compression Ratio in a 347 Stroker SBF - Forums at Modded Mustangs
 
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post #1 of 4 Old August 13th, 2006, 01:45 PM Thread Starter
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Raising the Compression Ratio in a 347 Stroker SBF

Anyone has an idea if it's OK to raise the compression ratio from 10:1 to 10.5:1 in a naturally aspirated 347 cid small block that has an aluminum head, 30# injectors and sees only premium gas (even 98 octane most of the times)?

I also don't know how much should I set my initial ignition timing. I'll be using MSD ignition controller & HVC coil.

I wanna mill the deck .005" and the World Windsor Sr .005" (this should reduce the combustion chamber volume by 1 cc approx) and to use a thinner head gasket. I'll use a Fel-Pro of .038" compressed thickness instead of my current Cometic .045"
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post #2 of 4 Old August 13th, 2006, 04:38 PM
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You'll have no problems unless you start getting around 12.1
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post #3 of 4 Old August 13th, 2006, 09:10 PM
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10:5:1 should be ok with 93 octane. Anything more will detonate and you might not here it but it will surely show up on a dyno graph.

My daily driver has 16 cylinders and 4400hp @ 1000 rpm....


***1988 Mustang GT - Stock....almost
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post #4 of 4 Old August 14th, 2006, 09:00 AM Thread Starter
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Thanks for your info, guys..

After some thinking, I'll stick to my original 10:1 plan cuz if I wanna go to 10.5:1 I'll need to do a lot of machine work on the block deck, cylinder heads and intake manifolds.. perhaps need to notch pistons too.
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