Time to Dial In - Chevelle Tech
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post #1 of 3 (permalink) Old Oct 13th, 19, 6:30 PM Thread Starter
Join Date: Oct 2018
Posts: 24
Time to Dial In

Hello Everyone and as always, I'd like to thank you all for your help. It's not always easy to figure this stuff out when you are new but you all make it a ton easier.

The time has come to start to dial in my 454. I have done a TON of research and have learned all I can from the internet but there are a few things I'm not too sure about. I plan to save up some money to take this into a reputable shop to have it dialed in on a Dyno but until then, I want to try to get it close.

Here's the setup;

454, Gen VI, Short Deck.
Holley 750 Double Pumper-R4779-9
Have not yet check what size jets, powervalve, etc
HEI distributor
Hooker Super Competition Headers 2217-1HKR
3 inch collector to 3 inch pipes
Flowmaster Super 44's
Seems to have a pretty aggressive cam shaft in it but I don't know exactly what it is.
I don't know much about the heads other than they are iron, rectangular port, and not stock.
I believe the compression is 9.5-1

How its running now;

With new plugs it runs very well. Very rich but no stumble, etc. But in a two or three days of driving the plugs foul, It backfires under hard acceleration. It also seems to bog when the secondaries come on.

I know I need to jet down but I'm not sure exactly sure how to do so. Should I jet down by two in both the primary and the secondaries? Should I change just the primary first?
Does anyone have a recommendation on where my timing should be?

Again, thank you all for you help

1970 Chevelle SS Clone 454 M22W
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post #2 of 3 (permalink) Old Oct 13th, 19, 6:56 PM
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Join Date: Sep 2006
Location: Los Lunas, NM
Posts: 8,530
Re: Time to Dial In

where do you live?
what is the elevation there where you are driving?
what is the initial timing set at?
how much more mechanical timing?

68-Malibu 427bbc/t4oo/3.73-12bolt/pro charger f1-r
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post #3 of 3 (permalink) Old Oct 13th, 19, 8:47 PM Thread Starter
Join Date: Oct 2018
Posts: 24
Re: Time to Dial In

I live in Southern California.
I drive at sea level.
I had the initial timing at 11
I believe the distributor has about 13 degrees of mechanical advance.
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