Originally Posted By: Mean buzzen half dozen A.K.A. Hank
I am pretty sure the 408 should make more power.
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Do you have an advance kit in your HEI?
Run as much initial timing as you can w/out getting pinging.
What is your stock timing supposed to be set @?
You have a stock untuned Holley 390 carb,there are adjustments to do to get better mileage. I recommend a professional.
But for now, you should get a wide band O2 reader (to see how rich it really is) & change your jets.

I forgot, you have which intake manifold now?
I got better mileage by advanceing the timing,more power everywhere & mileage on my moms Nova.
MBHD


I know his 408 with that cam should make more power
So how does the steering attach to that setup??
No I don't and what would it do?
Well with even my moderately advanced timing, my engine strains to start but that's what I used to run (advanced til just before it pings)
Stock for a 250 is TDC or 0 degrees (and it runs terribly at if it's set that way)
Alright. I'll try to find someone to tune it. Would it make that much difference?
I looked for a wide band O2 reader and can you reccommend one that doesn't cost like $150??

I have an offy intake with the holley 390 elec. choke

69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.