400 sbc small build

  #1  
Old 04-16-2019, 07:06 PM
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Default 400 sbc small build

Hello, I was wondering if anyone had any input on what the best route would be to gain around 50 hp & torque on a 2 bolt main 400 sbc.

Someday, I'll swap it to an LS, but that's not an option right now, I just want some more power out of the 400 while maintaining it's drivability, it doesn't have to be the fastest thing around. An LS1 might be an option, so I'd be open to some information on that but other LS motors are not an option at the moment.

As of now, it has longtube headers, a 4bbl carburator, a TH350 built for 500hp with a 2300 stall, 3.73 rear end.

Would a cam or heads give me about 50? Or would I have to do both? Any builds are ideas are appreciated and like I said I'm looking to gain about 50 give or take, while maintaining drivability, the car will be street driving with the occasional pull, not raced or anything wild, thanks for the advice/information.
 
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Old 04-16-2019, 09:04 PM
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A good cam could get you get you close, a cam and the right intake/carb combo could possibly get you more. What do you have for an intake and carb now?
If you have stock parts look into a nice bolt on package that works well together, a cam intake and carb designed to work together will give you a real seat of the pants bump in power.
https://www.jegs.com/i/Edelbrock/350...iABEgI4CfD_BwE
 
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Old 04-17-2019, 08:08 PM
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The intake is stock, and the carb is a quadrajet. Does anyone know the stock cam specifications for the 400? As I mentioned, I will be using it for driving around and would like to keep the power in the low and mid-range.
 
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Old 04-17-2019, 08:56 PM
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Originally Posted by Evan383 View Post
The intake is stock, and the carb is a quadrajet. Does anyone know the stock cam specifications for the 400? As I mentioned, I will be using it for driving around and would like to keep the power in the low and mid-range.
The kit I posted has a torque cam that is street friendly with low to mid end grunt, the stock cam is a broomstick and the stock intake restrictive ,the Q-jet isn't a bad carb but has it limitations without extensive mods by a really good Q-jet carb guy that knows some tricks.
Edlebrock did the research on the kit I posted to match parts that work well together, it would really wake up that 400 at a reasonable cost and still be street friendly.
If you start looking at heads you're taking a lot more money and you would still need a better cam, intake and carb or it would be a waste, also the 400 is not a high compression engine so you'd probably want to do a complete rebuild with better internals ,pistons rods etc.
The good news is you have plenty of displacement to help make the up for low compression and restrictive stock heads,you already have headers so with the cam,intake, carb package it should be a real strong puller.
I've owned a couple 400 small blocks, one in a '72 Impala and another in a '78 K5 Blazer
 
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Old 04-20-2019, 12:13 AM
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Alright I'll take your word for it! I'll probably get that kit you sent, or something very similar. Thanks for the information!
 
  #6  
Old 04-20-2019, 08:51 AM
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Originally Posted by Evan383 View Post
Alright I'll take your word for it! I'll probably get that kit you sent, or something very similar. Thanks for the information!
Sure thing, ask around and look at other kits, shop around, stop in at a local speed shop or parts house I think you'll get similar info.
Get back here and let us know what you came up with and how you like it.
 
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