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Old 01-06-2004, 06:17 PM
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350 with a 327 crank...

I've got a question. I am a newbie at engine building, so bare with me. I have been talking to people about building my 305 for my truck and my father-in-law has agreed to help me. However, he says that I should get a 350 with a 327 crank, at least a 4" bore, longer rods, etc. I also found this on another website:

Chevy should have built the 350 using the 327's 3.25" crankshaft, a bore of 4.140", and 6" or 6.125" rods.

My question, and again, please don't think to badly of me, is what will this do? I know it will increase torque, but is there anyway to know how much and is that all it will do? I can't find any answers anywhere on line. Can anyone explain to me why this is a good (or bad) combination so that I won't look totally stupid when I talk to him about it again?

Also, are there any good books for beginners to read?

Jon

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Old 01-06-2004, 06:29 PM
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good luck boring a 4 inch bore block to 4.14. Dont think its gonna happen. This would change the bore/ stroke ratio. It would probably make its power at higher rpm, and lose some lowend torque.
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Old 01-06-2004, 06:51 PM
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327 and 350 blocks are both 4 inch bores, why bother trying to fit the 327 crank in the 350 block? Just get a 327 if that's what you want.

Build a 383 if you want a stroker if you want power. 400 crank in a 350.

K
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Old 01-06-2004, 07:03 PM
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350 and 327 have the same bore but different strokes (3.48-3.25) so putting a 327 crank in a 350 will do nothing but make it a 327. They have different main bearing sizes or somthing like that so it would be easiest to find an old 327 block and crank rather that trying to fit a 327 crank into a 350 block . A buddy of myn runs a 358 sbc he told me it's basically a 400 block 0.060 over with a 327 crank. This small cubic inch drag motor has seen over 1000hp on the dyno. It runs 5.40's in the 1/8th with Nitrous. People are shocked when they ask "whats it got in it". The smaller cubic inch "destroked" engines don't really make more torque but they will make more HP and turn more RPM.
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Old 01-06-2004, 07:06 PM
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To make a cheap 327 you need a 307 crank with a 350 block and 327 pistons.

A 3.25" stroke with a 4.140" bore is a 327 crank in a 400 block = 350 rev'r.

Why do you want a 327? Its cheaper to built a 350.

Here's some info I'll let you in on - rev'r engines make more HP, but less TQ than strokers ( with total CID being almost equal ) - but rev'rs have to make it in the higher RPM's. There are guys who run 400 blocks with 350 cranks for this reason (377cid).

I'm building a 327 with a 350 block and a large journal 327 steel crank, but I'm also building it for the strip with my peek HP @ 7500rpm.

If your building it for a truck, then build it for torque - build a 350 as a 350 or 383.
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Old 01-06-2004, 07:15 PM
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Sorry guys but Jyzoz is right, to an extent. Heres why.

Quote:
Jyzoz wrote:
Chevy should have built the 350 using the 327's 3.25" crankshaft, a bore of 4.140", and 6" or 6.125" rods.
You are talking about an article in the June 1997 issue of Hot Rod magazine titled "The 350 Chevy Should Have Built"

A copy of that article can be found here:
The 350 Chevy Should Have Built.

I have considered doing this engine myself.
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Old 01-06-2004, 08:10 PM
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I think the point may be starting to get lost here. Chevy may have been able to design the 350 better than did but I'm not convinced that building an engine such as they suggest in the artical would be worth while. Seeing how they are using a 400 block in the real world you would be much farther ahead just to build a 400 and use cheap on the shelf parts and have the extra ci to boot.
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Old 01-06-2004, 08:40 PM
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400 blocks with 327 cranks are very good engines, if you want to spin them. The bore/stroke ratio is very good. It is basically a super sized 302 (chevy). I know a guy that runs one with a small blower and it runs pretty hard.

For a street car give me the cubic inches any day. Not much use for 7000 RPM power on the street, not to mention how many parts you will go through.

If you have the 400 block just build a healthy 406, and you will have WAY more torque where you can use it.

As mentioned above several times, a 327 crank in a 350 will be a 327 (you can not bore a 350 block big enough to get back to 350ci with a 327 crank in it).
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Old 01-07-2004, 01:40 AM
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I have to agree with cubes rule. You have a choice of a 327, 350, or 383 cubic inch engine depending on what crank you drop in the block. Torque wins drag races, and the longest stroke will have the most power and be the strongest street engine. Go back in time a little and note the demise of the 265 and 283 engines. The 327 smoked them on the street. The 350's introduction was somewhat clouded because of the smog controls introduced along with them. Had the 327 been saddled with the same burden, they would have been hurt even more. I've got a 327/350 block that started out as a 327, and when I get around to building it out, it will be brought to life as a 383.
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Old 01-07-2004, 06:34 AM
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While I tend to agree with the shorter stroke 350 theory, it would make a higher revving engine for drag use. But cubes generally always wins, all things being even. The 302 Chevy with a short gear is a real gutless engine, almost mo torque. Put a 4:10, or 4:56 gear behind it and it will come to life, easily spinning to 7K and beyond.

I remember a shoot out published in Hot Rod magazine back in the early seventies that had the 69 Z/28 Camaro and the 69 Boss 302 Mustang against each other. They did some identical mild tuning to each car and installed taller gears in each car. Both cars were running low 12 second quarters, and were real close in times.

Just all depends on the use of the engine.

Vince
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Old 01-07-2004, 08:44 AM
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Just build a 350 chevy. Parts are much cheaper and would be a good first time build. 327's can get expensive with the pistons and stuff when you can get a complete flat top master kit for around $250 for a 350 with an RV cam up grade.

Cstraub
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Old 01-07-2004, 08:51 AM
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I have to agree with M&M... a 327 crank in a 400! My history has been with big block chevy's (not sure why, they seem to jump into my lap!*G*) BUT ...my next engine will be this 350 built from a 400 block and a 327 large journal crank, with 11:1 piston using pump gas! AND IT WORKS GREAT!!! Look into it BEFORE you build anything else, you won't be sorry!! Good Luck! ...Mark
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Old 01-07-2004, 10:47 AM
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In dirt racing.....

the 377 (400 block/350 crank) is used effectively on short quarter mile tracks, because they come off the corners so well if the right cam/intake/carb combo is used. And when the track gets slick, they are good because they don't spin the tires so easily. Most every one of these engines I have seen were after market blocks (Dart or Bowtie) because at the horsepower they are making and the constant RPM's they are turning, the main webs in an OEM 400 block will come apart and you would be running over your crank in a short time.
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