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Old 05-23-2011, 06:37 PM
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getting a 400 sbc.wtd

ok well im getting a 400 sbc tomorrow morning, and i was curious if they had performace vortec heads for these engines. And also i was curious as to what i would need to make this 400 into 377.

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Old 05-23-2011, 07:10 PM
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Use A 400 with a 350 crankshaft to get a 377
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Old 05-23-2011, 07:12 PM
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haha ok thanks! well i was wondering if the stock rods for the 400 would work?
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Old 05-23-2011, 07:24 PM
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Quote:
Originally Posted by chevy302builder18
haha ok thanks! well i was wondering if the stock rods for the 400 would work?
To use the smaller journal 3.48" stroke 350 crank in the 400, the difference in journal diameter has to be made up w/either spacers and normal bearings or spacer bearings.

You aren't getting a crank w/this 400? 'Cause if you get the crank, just build a 400 and skip all this destroking BS. There's no advantage in doing a 377 over a 400, unless there was a racing class displacement requirement that could be met this way. And if that were the case, a custom crank would be the better way to go about it instead of spacers/spacer brngs.

You wouldn't want to use the 5.565" 400 rods. Most builders use at least a 5.7" rod and many use 6" rods.
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Old 05-23-2011, 07:37 PM
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o super true! I didnt think about that i was thinking in between. It is coming with the crank, just seeing my advantages, just thought there was something special in a 377. Still learning, LOL im just looking best ways to go. The 3.75 stroke would give me awsome torque specs. But is there heads with the steam ports that vortecs? And if so could someone show some of these so i could find good low end torque?. Im just gonna do some heads on it with a better cam, something streetable BUT can hall a** at the strip. Im super ecstatic thank you guys!
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Old 05-23-2011, 07:50 PM
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A head w/o steam holes can be drilled for them, no sweat. If you want to use a 64cc nominal chamber size head (like the Vortec), the pistons should be a "D" shaped dish. IIRC KB has D shaped 18cc or 21 cc pistons that will give you 10.1 to 9.8 to CR (w/a 0.041" quench), respectively.

GMPP has small and large port Vortec heads that are a step or two above the production Vortec heads if you are thinking about buying new heads. Or there are any number of aluminum heads to choose from.
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Old 05-23-2011, 07:55 PM
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sweet! This is a long block so Could i reuse old steam ports off of old heads?
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Old 05-23-2011, 10:22 PM
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o and also are those $620 summit iron vortecs 67 cc Chambers 170 intake runners, are they any good? Ill look into expensive ones, but i wanna go cheap. And also im wanting to do the dual plane stage three street and strip for $200. Let me know what you think
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Old 05-23-2011, 10:36 PM
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Here's the procedure to drill your own steam holes. Be sure and use a 400 head gasket with steam holes in the gasket.
http://www.gregsengine.com/convertin...ds-to-400.html
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Old 05-23-2011, 11:30 PM
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Originally Posted by techinspector1
Here's the procedure to drill your own steam holes. Be sure and use a 400 head gasket with steam holes in the gasket.
http://www.gregsengine.com/convertin...ds-to-400.html
Haha dang ima sure looking like a blonde right now, thought the steam ports for a 400 were on the sides of the heads that relieved the pressure by a release valve or steam valve haha thanks inspector! This wont be hard
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Old 05-23-2011, 11:54 PM
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Here's just a suggestion....before you plan anything or buy anything sit down and read everything you can about small block chevys.....especially the 400. The more you educate yourself the less likely you are to waste your time and money on parts and combination of parts that won't work.
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Old 05-24-2011, 02:47 AM
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I agree with you, i dont wanna spend out ragious money looking for power either. That would be tragic. Im not looking for real hardcore rpms, Its going in the 92 S10 i got, so the idea is 3.73.1's in the back, stall at 1200 rpms? Hmm sounds like a good deal. Built 700r4 trans. Its getting bought tomorrow and i know this will be whats meowing at my door step, something fun and legal. Of coarse like you said, i will be reading and TRYING to find specs of a good combo for the 400 sbc, of coarse i have looked and scoward the WWW, for the specs on these really cheap vortec summit heads. Not one person has posted about these heads, not even on other SBC's or other sites! I googled it. Im going to have like 5 months to think on this bc thats when im doing the S10 build.
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Old 05-24-2011, 03:44 AM
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craigslist engine, O and i did forget to mention, i am getting this engine dirt cheap, $175 you cant beat the budget with a long block that much and all ill probably have to do is the top end. saves me the $ especially when before i was stuck on thinking on buying a 355 block from summit and rotating assly both $1300
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Old 05-24-2011, 08:35 AM
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Again.....you know NOTHING about this craigs list engine, it quite possibly has already been bored .030 or hopefully not .060 which would pretty much make it useless if it required further maching. It could have a ton of problems and believe me....sellers will lie about the condition of their engines. If the guy won't let you pull a head to check the bore size and pull the pan to check crank journals and bearings then I would pass. No offence intended but from reading your prior posts I really don't think you would know if it was a 327, 350 or 400.........buyer beware.
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Old 05-24-2011, 12:27 PM
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yea i do now i have confirmed the engine great piece of machinery. Its standard bore 2 bolt block 101 casting high nickel, a rod journal needs turned .0010 and it has no rust at all he showed me even the rod needs replaced. And yea i did get a good deal dont tell me what i dont know.. Yea might need a lil work, he even had the head off to show me, pistons are setting good in the engine. Not much of a bore lip, I checked all the Main things on this block, oil anti freeze even dropped out of it, he even gave me oem replacement cam from comp cams and lifter set. He said a guy came to his shop with the engine, hes had it since the 80s in an air conditioned room.
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