[McSS86]

I have a 400 sbc with some stock parts well i wont say stock but some parts that i think needs upgrading can you tell me if it will make a difference in the hp. I'm changing my distributor to msd. Im changing exhaust to hooker. I'm changing 650 elderbrok to holley. And im changing alternator to a higher amperage.Any feed backs?

[bigdog7373]

MSD distributor is a good choice. What is your current exhaust system; do you have headers; what size pipes? 650 carb is way too small for a 400, get at least a 750; doesn't have to be a holley, edelbrocks are good carbs too. Higher amperage alternator is going to rob power, use the smallest alternator that will get the job done.

[McSS86]

My current exhaust is the stock exhaust that comes with the Monte Carlo's and the size of the pipes i don't really know but what size pipes is best? How much amperage is best?

[bigdog7373]

For the exhaust, go with long tube headers, 2.5 inch dual pipes, and thrush turbo mufflers. You could also put in an h or x pipe which help add a little more hp. As for the alternator, i would need to know every electrical accessory that you have in you car, then i could tell you what to get; or you could just get an oe size.

[UngerMarkus]

Do you still have the stock q-jet? If so, i would rebuild it and go for this carb. If not, I would keep the edelbrock. In my opinion, 650cfm are sufficient for a stock or mild 400 SBC. I assume you have an edelbrock performer or thunder avs carb. swapping for a holley would be nonsense. better spend the money somewhere else!

I recently rebuilt my buddy's 400 sbc. he runs that engine in a chevy blazer. with long tube headers, an 650 edelbrock thunder avs and a pertronics hei distributor. I just added a weiand action plus intake, matched the intake and exhaust ports and gave the heads a decent port job. It is a huge difference! And don't just set the ignition to stock specs!!! carefully advance it a little and do some track tuning. same for the carb!

Good luck and have fun!