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Old 04-11-2009, 10:12 PM   #1 (permalink)
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Small Block weight v. Big Block weight?

Any body know the difference in weight between, say a 351W stock and one of the stock big blocks, comparably equipped? If I'm simply looking to build my road car/ cruiser (1969 Mach 1) with the power to weight ratio in mind, doesn't it make more sense to put in a bored-out small block with equal displacement to a big block (I'm looking at a small block 427 aluminum crate motor) instead of going with a big block? What're the pros and cons of big block versus small block if they're the same displacement?

Thanks to any and all that can fill me in...
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Old 04-12-2009, 12:31 AM   #2 (permalink)
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Re: Small Block weight v. Big Block weight?

351W=525
351C=575
390-428 FE = 625
429-460 = 720

Lighter is better for sure.
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Old 04-12-2009, 06:52 AM   #3 (permalink)
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Re: Small Block weight v. Big Block weight?

Also the small block will be much easier to work on in a mustang engine bay..
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Old 04-12-2009, 07:26 AM   #4 (permalink)
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Re: Small Block weight v. Big Block weight?

a small blok will be lighter but for the price of an alum. 427 crate motor you could build a nasty 545 stoker that would make enough torque to overcome any weight difference!!!
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Old 04-12-2009, 09:27 AM   #5 (permalink)
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Re: Small Block weight v. Big Block weight?

what 347LX said. but for less money, 650 HP pump gas is easy to with the 385 engines
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Old 04-12-2009, 10:29 AM   #6 (permalink)
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Re: Small Block weight v. Big Block weight?

And using aluminum intake, heads, water pump etc: takes a lot of weight off a 385,, long tube headers are lighter than stock cast iron too.. A mild build 460 can produce stump pulling power easily
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Old 12-31-2010, 06:48 AM   #7 (permalink)
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Re: Small Block weight v. Big Block weight?

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Originally Posted by Fomoco8 View Post
And using aluminum intake, heads, water pump etc: takes a lot of weight off a 385,, long tube headers are lighter than stock cast iron too.. A mild build 460 can produce stump pulling power easily
My 545 with aluminum heads, intake, water pump, lightweight stater, headers, weighs 573. Not bad considering it weighed 720 to begin with.
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Old 12-31-2010, 08:09 AM   #8 (permalink)
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Re: Small Block weight v. Big Block weight?

if youre comparing same displacement the small block will be a better choice.

if you want less weight the small block is a better choice.

If you want big power and speed the big block is a better choice.

adding aluminum heads and intake manifold, mini starter and waterpump to the big block greatly reduces its weight and makes it perfectly manageable.

its a 150lbs difference.some dont like that much extra weight sitting in the front. others dont mind it. as far as speed goes, im sure the 20hp you need to overcome that weight can be found somewhere in the extra 120 or so cubic inches you have to work with.

oh yeah, im sure the small block would be easier to work on though cuz it wont be hogging up all the space in your engine bay

for the price of am all aluminum 427 you can probably build a hemi headed 557 making somewhere near 1000hp.
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Old 12-31-2010, 10:31 AM   #9 (permalink)
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Re: Small Block weight v. Big Block weight?

These guy's all have great thoughts but I cannot see any significant Driver Cruiser car GAIN from a 100 to 200 LB engine weight difference....

Race car down the the "nth" degree of time and HP sure, I can follow your thoughts, but a driver/cruiser power to weight ratio can be easier adjusted by removing sheet metal and replacing with lighter materials and a couple other routes that ease the removal of dead weight.

I suppose that if it's a Road Race car, that the engine weight versus HP will have a greater impact on cornering and handling... These guy's are awesome with their answers!

Are you going to road race it?
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Old 12-31-2010, 09:38 PM   #10 (permalink)
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Re: Small Block weight v. Big Block weight?

Quote:
Originally Posted by Brett Olson View Post
351W=525
351C=575
390-428 FE = 625
429-460 = 720

Lighter is better for sure.
351C = 550lbs
351M/400 = 575
352-428 = 650

Guys on the 351Clevelnd.net board have pix of a alloy headed 400 stroker weighing roughly 530lbs. A alloy headed 427ci stroker 351W should be below 500lbs as should a alloy headed 351C. Search the Clevo board and you will find a Ford released engine weight spreadsheet that breaks down the engine weight to the component.

If you plan to take your car out to the road course, you can tell the difference when that 100+lbs extra is hanging over your front wheels.

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Old 01-01-2011, 09:22 AM   #11 (permalink)
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Re: Small Block weight v. Big Block weight?

Flatlander Racing - Ford Racing 460 Block



290lbs before assembly..................
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Old 01-01-2011, 09:33 AM   #12 (permalink)
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Re: Small Block weight v. Big Block weight?

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Originally Posted by Ggrahn View Post
Flatlander Racing - Ford Racing 460 Block



290lbs before assembly..................
where is the 200lbs plus Ford Motorsports or Dart/World W blocks ? btw , on the big block , thats shipping weight
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Old 01-03-2011, 05:30 AM   #13 (permalink)
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Re: Small Block weight v. Big Block weight?

I think you always have to factor $$$$$ into the issue...

I have been sourcing parts for a 460 build and comparing them to a comparable 351 build, and everything seems to cost pretty much the same. BUT, you can do a lot more with the stock 460 heads than you can stock 351 heads. The only way to make real power with a 351 is with aftermarket heads, while you can massage stock 385 heads to make decent power...
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Old 01-03-2011, 11:22 AM   #14 (permalink)
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Re: Small Block weight v. Big Block weight?

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Originally Posted by DanH View Post
where is the 200lbs plus Ford Motorsports or Dart/World W blocks ? btw , on the big block , thats shipping weight
I thought mine was like 305 crated. If its not 290 then its at least 289 and 3/4, its a pig to say the least. I know taking it to 4.6 bore removed something like 55lbs of iron. I'm almost ashamed to say this but I wish v8's were more like honda blocks (weight wise), engine hoist be damned.
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Old 01-03-2011, 01:20 PM   #15 (permalink)
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Re: Small Block weight v. Big Block weight?

Just remember if you go with a big block it is a tight fit, not that it hasent been done. Changing plugs is a *^%^%$#^^$. I once looked at a 69 Mach 1 with a 429 I think I could see 2 mabey 3 of the plugs. I would go with the small block 427. I have always wanted to build one. Also if you don't want to spend the money on all alumnium you could go with a cast block and only gain 50-75#.
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