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327 v 400

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bm3501466

07-21-2006 08:24:36

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Are the block demensions on a 327 chevy exactly the same as on a 400 chevy? What are the measurements in terms of height, length, and width?

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Keith-OR

07-21-2006 11:33:10

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Re: 327 v 400 in reply to bm3501466, 07-21-2006 08:24:36

bm3501466 you need to be careful on this, as GM also made a "Big Block" 400 and 402 CI which is completely different in size. And the 327 CI was classified as a small block.HTH

Keith & Shawn

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Tim...Ok

07-21-2006 09:09:11

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Re: 327 v 400 in reply to bm3501466, 07-21-2006 08:24:36

Yep,like Allan said,same physical size,same bellhousing,same motor mounts..One thing to remember,if your going to use heads off of another smallblock on a 400,they'll bolt right on,but there are steam holes that MUST be drilled in the heads or it WILL overheat..use the 400 head gasket as a guide to drill these holes... the 400 uses a siamezed block so it requires these holes,where all other smallblocks do not..

You'll love the grunt a 400 has compared to other smallblock chevies..makes the rest seem kinda wimpy :0)

Tim

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Jak

07-21-2006 12:51:24

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Re: 327 v 400 in reply to Tim...Ok, 07-21-2006 09:09:11

I removed a 305 out of a 1983 K5 Blazer and put in a 400,MAN!!!what a difference,it was awsome and better gas mileage to boot.I went with a stock cam for low end torque and that dern thing felt like a big block under the hood.Everything matched up and looked like the original 305 and never overheated.I got some 400 badges off an old impala and put them right under the parking lights on the front fenders,looked nice.Had fun with that thing,I miss it.

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Allan In NE

07-21-2006 15:40:19

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Re: 327 v 400 in reply to Jak, 07-21-2006 12:51:24

Been around Chevies since forever and never was impressed with the big blocks. They always seemed like a lot of blow and no go to me.

I think that little 400 was the strongest engine GM ever built. When switching from a 350 to the 400, it is like someone turned on the afterburners. An easy 30 horse difference. :>)

Allan

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Tim...Ok

07-22-2006 05:01:04

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Re: 327 v 400 Allan in reply to Allan In NE, 07-21-2006 15:40:19

Allan,if your ever down this way,you need to take my 82 shortbed for a spin..might change your mind about big blocks :0) .060 over 454 (468) and th400 with 3.90 gears..it"ll pretty much rip your head off.. it"s got all the goodies inside and out...it made 538 hp at the rear tires without the 150 horse nitrous I"ve got on it for those times when too much still isn"t enough...

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jdemaris

07-21-2006 18:55:48

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Re: 327 v 400 in reply to Allan In NE, 07-21-2006 15:40:19

I've got nothing but good to say about the small blocks (except maybe the 307s). I remember when the ultimate street car that I couldn't afford was a 55 Bel Air with a 265 bored to 283. Sears-Roebuck used to sell a kit for it. From my experience, there was never a better high-revving engine that the 327 - especially the 365 horse Vette engine. But . . . late 60s a rich kid in town got a new big-block Chevelle from his parents in 1966. All stock with the highest output 396 offered. Nothing in the area could touch it - not small blocks, Hemi-Cudas, 421 Goats, etc. The rich kid couldn't even drive a four-speed trans., so he got other guys to drive it for him in 1/4 mile runs. He finally drove it into a tree and it was done with. Years later, I had a few 396s and 427s and none of them ran like that Chevelle. Also had a Powerglide 409. I read somewhere that Chevrolet, for the first two years of production, greatly understated the horsepower ratings of the 396. True or not, I don't know. The most impressive small block I've ever been around was - I think in 69. A friend got out of Nam and bought a brand new Z28 when it came with a high-output 302, solid cam, factory installed headers, double-pumper Holley, and a rock-crusher M-22 trans. That thing ran and sounded like a space-ship - and I've never been in anything else quite like it. As I recall it was a short-stroke engine - basically a 327 with a 283 crank - or something like that, along with big valves heads, etc. It would of been interesting to see what the Z28 would of done against the big-block SS396 Chevelle - but it never happened.

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Allan In NE

07-21-2006 08:36:24

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Re: 327 v 400 in reply to bm3501466, 07-21-2006 08:24:36

Yep,

Same-o, same-o with the small blocks. All 265 thru the 350s.

Allan

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Jon Hagen

07-21-2006 10:10:16

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Re: 327 v 400 in reply to Allan In NE, 07-21-2006 08:36:24

Same external everything,but a 400 is externally balanced. You must use 400 flexplate/flywheel and vibration damper on a 400 to maintain balance. One neat little gadget I used in my dirt track racing days was a "balance plate" that fit between the 400 crank flange and a non 400,nuetral balance flywheel to make it balance a 400 engine. speedway motors in Lincoln Nebraska used to sell them. Most any speed shop should be able to find one. They work to make the nuetral balance flywheel for a medium truck (12 inch clutch or larger)work on a 400,which was never put in anything larger than a 1 ton pickup.

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bm3501466

07-21-2006 10:17:16

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Re: 327 v 400 in reply to Jon Hagen, 07-21-2006 10:10:16

Will the balancer for a 400 fit in the bell housing of a 327?

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Glen in TX

07-21-2006 12:32:15

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Re: 327 v 400 in reply to bm3501466, 07-21-2006 10:17:16

Yes they fit. Like said the 400 is externally balanced and front vibrational dampner is different and you will see weights on the flex plate for 400 and none on flex plate for a 350 and others. I've knocked weights off a old 400 flex plate and welded them on a new 350 flex plate and it worked fine. You might also need shims under starter when switching things around.

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Bob

07-21-2006 11:55:49

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Re: 327 v 400 in reply to bm3501466, 07-21-2006 10:17:16

Yes, the weighted flexplate or flywheel will fit in all the bellhousings that otherwise fit the engine.

Also, one change over the years in the SBC's is the presence and location of various accessory mounting holes in the front face of the cylinder heads, and the intake manifold.

This will determine which accessory brackets will fit the engine.

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