What can holod more boost?? 306/331/347???

DirtyD916

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May 25, 2003

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#1

• Jul 2, 2004

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I was curious what can hold more boost? a nicely built DSS, 306, 331, 347? IO was thinking the 306 because of the greater cylinder wall size and strength, but i wasnt quite sure. Does anyone have a good idea? I would say a 9.0 compression or 8.8 compression on all of them, and hopefully in the neighborhood of 15-20 psi of boost. Sounds like a lot but its just an estimate. -thanx.

 

TIMMY2734

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Doesnt matter. What does matter is your rotating assembly and your block. for that much boost, id stay 8-8.5

 

DirtyD916

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ya 9.0 seemed a little sketchy. Its just that in my 5.0 and super fords magazine, the issue with the King of the streets them to it, there was a coupe that had a 347 and an s-trim wiht like i think 17 pounds of boost, but had a compression of 10.0!!!!! and it was a daily driver! SO i wasnt sure if this was a possibility or not.

 

BlackFox5.0

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#4

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a 331, and 347 are just stroked 302's....the one wit the thinner walls would be the 306. Having a high amount of boost can be bad. The tempertures of the air at that boost would cause detonation problems. An intercooler would be best for this. Ideally you want to keep your boost level as low as you can to avoid heat from compression. Opening you engine with better airflow will allow you to make more power at low boost, than a choked up engine with 15psi.

 

C

custom89stang

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i think thats wrong. 331 and 347 ARE NOT stroked 302's...they're stroked 306's....thats what i thought. i thoughta stroked 302 was a 327 and a 343 ....maybe i just wasnt paying attention

 

TIMMY2734

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its the same exact thing...... one is just 30 over

 

DirtyD916

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ya i thought it was the same thing.

 

DirtyD916

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and wouldnt the 347 have the smallest cylinder walls due to the boring of the block?

 

9

90Notch

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Cylinder wall thickness has nothing to do with it, its the thickness of the top of piston that comes into play more and of course the parts. Theoretically a 306 can handle more boost than a 331 & 347 since it has the thickest compression height of the three listed.

 

TIMMY2734

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They will all have a 4" or a 4.030" bore. The cubes come from the extra stroke in the crank.

 

DirtyD916

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#11

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o ok thanx timmy that actully is helpful!!!

 

Grn92LX

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#12

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A 306, 331 and a 347 will ALL have the same cyl wall thickness as they're ALL .030" over bore.