Holley 4160 carb on 400 SBC. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-14-2005, 06:03 AM
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Holley 4160 carb on 400 SBC.

Alright I've got a Holley 600 Vac secondary carb list #1850-4. It's mounted to a 400 small block chevy with the following mods:
Edelbrock performer intake
Lunati Bracketmaster II cam - 284/284 advertised dur, .458/.458 lift, 110 lobe sep.
Accel super coil, distributor, and shorty header plugs
Hooker super comp full length headers
comp cams double roller timing chain.

I would say its a fairly mild street/strip motor. But just recently got it running with all the new parts. (used to be a completely stock 400). Anyways I was wondering what a good jet size would be to start off with and what sites you guys would recomend on learning how to tune a holley. (kinda wishin I woulda just kept the Q-Jet on it.. )

Also does it matter which side the PCV valve is on? It used to be on the driver side valve cover.. But with the new carb it appears I'll have to run it on the passenger side and the breather on the driver side.. Does this hurt anything?

Thanks,
Matt

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Old 05-14-2005, 09:32 AM
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Personally I agree, you should have kept the Q-Jet but............. it sounds like you didn't. Get yourself a good Holley tuning manual, I've done pretty well with the S-A Design's manual but mine is 25 years old, I'm sure it's been updated a couple times over and there may be better ones now. As far as sites, this one has some pretty good carb people, you can also try Team Chevelle and Chevy Talk.

How does it run on the stock jetting? That's the best place to start then make changes from there if needed. I'd be willing to bet it's not that far off. See if one of your buddies has some jets on either side of the stock ones that you can use to dial it in. Unless you plan on making changes later there's no point in buying half a dozen pairs of jets to try, or make that many runs to the speed shop and then have a bunch laying around you may never need again. Let somebody else do that and then borrow their's. The secondary side is a little tougher on a 4160, no jets just a metering plate. The plate can be changed but they're a bit more expensive than a pair of jets. If you think you need to change the secondary side you may want to consider upgrading it to a 4150 by adding a secondary metering block kit. As far as anyone being able to pick the ideal jetting for your application by "remote control" over the internet that would only be guessing. There are several variables that come into play besides the engine. Climate, vehicle weight, transmission type, stall speed if an automatic, rear gear ratio and tire diameter and the "realistic" usage of the vehicle. Don't jet it for all out 1/4 mile performance if it will spend 99.99% of it's time cruising or hauling you back and forth to school or work. If it will see dual duty you may want to consider a 2nd carb set up just for the strip.

As far as the PCV, it doesn't mattter which side but couldn't you run a longer hose and keep it where it is? Just a thought.
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Old 05-14-2005, 09:48 AM
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Always start with the stock jetting.

Cruise at a series of steady speeds in 20 mph increments. See if you notice any surging. If so jet up a couple sizes. If not you are probably where you want to be.
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Old 05-14-2005, 11:22 AM
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The sites for Holley are in the Knowledge Base along with other carb info.
Before you change the jets you need to know how to read the spark plugs.
Here is Holleys site with a free down-loadable manual and trouble shooters guide.
http://www.holley.com/HiOctn/TechSer...o/FMCTech.html
When you need info please try the Knowledge Base first.
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