Few questions on my 347 build

castine917

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What about going higher compression stroker for now with stock block and if you want more power later build an aftermarket block for boost then?
 
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ElrodKTPQ_89

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This is probably more of a question for the safe zone, but could someone explain different compression ratios and what effect they have on performance, etc.?
 

castine917

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Not sure of your knowledge level. No offense intended if your knowledge was above this.

Simplest and not always true is that every point of compression is worth an amount of power but also more likely to detonate. On average, your gasoline street cars range from lazy 8to1 to raucous 11to1. Generally you want a forced air engine closer to 8to1 or 9to1. Forcing air increases heat and leaves less safe zone against detonation. To add to confusion is usually people talk static compression but sometimes they talk dynamic compression.
 

BlkoutGT

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Take a 351ci block use the 347 crank assembly except the rods. Fit the bill for long rods. Torque curve and octane tolerance goes WAY up.

Are you suggesting using a 347 crank in a 351w block?
 

evilcw311

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Are you suggesting using a 347 crank in a 351w block?

Yes. It's been done several times due to the strength of the 351w block. But as op stated he's not going this route as most won't cause there's a lot more cost involved with switching everything over to a tall deck block.


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BlkoutGT

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Yes. It's been done several times due to the strength of the 351w block. But as op stated he's not going this route as most won't cause there's a lot more cost involved with switching everything over to a tall deck block.


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Not to derail or hi-jack this thread but... Could you please show some links for that swap? The main bearings are a completely different size.

Thanks.
 

evilcw311

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Not to derail or hi-jack this thread but... Could you please show some links for that swap? The main bearings are a completely different size.

Thanks.

It's not technically a 347 crank. Back in the day some road race guys used a 3.4 stroke in the 351w blocks for higher rpm but the 3" mains are not good above 6500.

Ford racing 351w blocks use the 2" mains to fix that issue.


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Musturd

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If going stock block for now and want to make some good power I would go with a 11-1 compression ratio of close too my old setup was 10.8-1 custom solid roller cam shaft and victor jr heads with a systemax and made 419rwhp n/a . This was prolly one of the funnest combos I've ran on the street .
 

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