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Bore sizes in blocks 

 

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 Post subject: Bore sizes in blocks
Posted: Thu Jul 24, 2008 10:44 pm 
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I've been doing a bit of window shopping lately and have been looking at blocks. I've noticed that a couple of options for bore size are available. 4.000" and 4.125". Why do we have the option and how should we know what we want?

Chad

 

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Posted: Thu Jul 24, 2008 11:27 pm 
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I assume you are looking at aftermarket blocks ??
Yes they come in .125 oversize.. Ford's Boss, Dart and Man o war...

 

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Posted: Fri Jul 25, 2008 12:24 am 
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Oversize = extra cubes.
But will need oversized pistons to match.

 

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Posted: Fri Jul 25, 2008 12:27 pm 
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Yeah, been looking at Dart blocks. If I were to go for a 347 rotating assembly, then what would the capacity increase between the 4 and 4.125 bore be?

 

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Posted: Fri Jul 25, 2008 3:53 pm 
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4.00 bore = 342ci
4.125 bore = 363ci
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Posted: Fri Jul 25, 2008 4:58 pm 
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The other benefit with the bigger bore is it will unshroud the valves for a better flow area. Would work well with a boss/clevo/CHI head.
Also, you can use a different bore/stroke ratio to make the power at a different rev range.
eg - 4.125 bore x 3.25 stroke is still 347 cubes, but the shorter stroke will mean the engine will rpm better, but make a bit less torque. Or you can stay with the 3.4 stroke and make a big cube stump puller.
SRP/JE and a few others make a good piston to suit these combos, so custom is not reqd. :D

 

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Posted: Fri Jul 25, 2008 6:30 pm 
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Cheers for the clear answers guys... 363... mmmmm

 

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Posted: Fri Jul 25, 2008 6:54 pm 
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Or you could go with a 4 inch stroker crank and go a bit bigger, 402 cubes 8-) .

Looking locally and overseas? Any good prices?

I'll be building a stroker soonish too, just not in a ford. :twisted:

 

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Posted: Fri Jul 25, 2008 9:47 pm 
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schnoods wrote:
Or you could go with a 4 inch stroker crank and go a bit bigger, 402 cubes 8-) .

Looking locally and overseas? Any good prices?

I'll be building a stroker soonish too, just not in a ford. :twisted:


Not in an 8.2" deck block you can't.
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Posted: Fri Jul 25, 2008 10:18 pm 
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I've been looking overseas. With the way the $ is, you'd be silly not to. With the block though, I haven't yet looked at freight and duty. This will probably bring things on par with local prices.

 

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Posted: Sat Jul 26, 2008 12:12 am 
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XR9UTE wrote:
schnoods wrote:
Or you could go with a 4 inch stroker crank and go a bit bigger, 402 cubes 8-) .

Looking locally and overseas? Any good prices?

I'll be building a stroker soonish too, just not in a ford. :twisted:


Not in an 8.2" deck block you can't.


Of course but with after market, for $170 more you can go 8.7" and for $340 more you can go 9.2" as well, not much more when you consider the price the whole lot is going to slug you. :evil:

 

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Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Sat Jul 26, 2008 12:16 am 
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Scaffy wrote:
I've been looking overseas. With the way the $ is, you'd be silly not to. With the block though, I haven't yet looked at freight and duty. This will probably bring things on par with local prices.


I've had alook a few months ago too, prices were good then, though When I was looking over, I managed to find 408 cube Mopar motors cheaper than 347-363, and not having to deal with EFI accesories on top, kinda made my decision for me.

Will be good to see how she goes Chad, just browsing or serious plans if you dont mind me asking?

 

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'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Sat Jul 26, 2008 8:58 am 
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I'm just browsing at the moment, but if I can get a few more swings out here then it'll be up for some very serious consideration.

 

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Posted: Sat Jul 26, 2008 10:18 am 
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thanks heaps for asking that question scaffy, saved me typing it out :)
im looking down the same path as you and had the same question.

i was looking at a ford racing 347 short block for about 5 grand already assembeld with the 302boss block but then i found that block for about $1200- $1400 and jegs have the scat 347 stroker kit for about $1200, thats us dollar, plus freight and taxes and some labour and should still come in under $5000.
when looking at aftermarket blocks i was surprised how cheap they are in the states.
do you have any idea how much freight would be on a block?

like you, im just weighing up options atm.

 

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Posted: Sat Jul 26, 2008 1:05 pm 
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I think you may find you'll have issues with the boss 302 block and 347 roatating assembly. I think it was ozrunner who pointed it out in my thread. It may pay to go and have a look through and see if you can find it. Unless someone wishes to go through it all again here. I don't remember the ins and outs of it all...

 

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