I am pretty sure the 408 should make more power. http://cgi.ebay.com/ebaymotors/AUTOFAB-6...sQ5fAccessories 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
Originally Posted By: snowman4839
Originally Posted By: Mean buzzen half dozen A.K.A. Hank
Engine dyno huh.
That seems pretty low. He will be lucky to run 14's LOL.
You are going to smoke that weak 408!
If your SPA put the turbo close to the stearing shaft, you can always upgrade & use a bolt in rack & pinion stearing unit, should give you more room I would think?
But,,,, do your homework.
Dont know where anyone said the stock 2.5" manifold flows bad for a turbo set-up.
Mileage,, are you running stock timing? Is your choke partially closed? Are you flooring it everywhere you go?
How is the compression? Tires inflated properly? Front end is perfect/alignment? Carb worn out, needle worn, etc.
Best my moms stock 73 Nova got on the freeway was 16 MPG. Moving the timing around made a huge difference in power & mileage.
Run an MSD box & an adjustable timing control & play with your timing.
MBHD
Well thanks for the vote of confidence but I do feel pretty bad for him. And that was just a preliminary. He probably will do what he has to do to get like 375hp out of it.
Not to sound like an idiot but I thought all cars were rack and pinion? They have a different form of steering than rack and pinion?
Well I think it was tom that said the SPA would flow much better and it would just be all-around easier (but I may be wrong).
I'm running like 8 degrees BTDC choke is electric and turns all the way off I floor it like about 15% of the time so not really
Haven't tested compression New tires and yes Haven't aligned the front end Freshly rebuilt Holley 390. I checked inside and they did a good job too.
What made her milage better? Finding the right advance? More toward TDC?
I'll get an MSD box they make for turbos once I get the turbo on there
