raceman14 wrote:A 1971 350 Chevy truck would not be emissions hampered unless it came from California. Trucks were a couple years behind all that emissions stuff.
Advancing cam timing on a Chevy v-8 would be the same on just about every one ever made because there is not much difference in piston speed and compression from a 265 to a 400. Like I said in my earlier post you almost cannot get the intake advanced too far on an SBC and especially on a street engine as the compromise is in top end power above 5000rpms.
How many stock pick-up trucks hit 5000rpms on a regular basis?
I built a 400SBC with 9.5 compression, 305 #601's I think on the heads, dished KB pistons, 5.56 rods, and a 390 BGN 4-bbl carb with pretty rare 2 stage power valves ( they really work ). It was in a 1989 Suburban that I drove back and forth to Charlotte as my Serdi Service vehicle. It made over 500ft/# RWTQ and about 325RWHP @ 4500rpm. From red light to red light it would keep up with most 5.0 Mustangs and Z-28's it was a blast to drive. It had a Reed hydraulic cam in it that was 214-224@.050 on a 106 lobe separation .390/.410 lift. I installed the cam with the intake on 96 and the thing ran like a top for almost 250,000 miles. I kept a log book on that truck for every mile I ran for tax purposes and it got 20-21mpg on the hiway and 18mpg around town.
I would still have it today but it was stolen from my shop while I was at Talladega. They caught the thiefs about 5 years later on an ATF / DEA deal, I did get about $50K worth of tools and tool boxes back but the truck was long gone. The group of them got 20+ years no parole ( cause of the guns and drugs ).
If I built that same engine today and put a 4L80E behind it she might get 25mpg, especially with the better 16" Michelin XPS ribs I run on my truck now. They run at 90psi and give a great ride and the old Kelly Springfields ran only 35psi, there is about 2-3 mpg right there.
I agree with most everything you guys have said about tuning and cold air and all the rest, but I also know there are huge gains to be made in advancing any camshaft, and if it does kill power and you want it back you just have to go bigger on you .050" duration to get it back. Basing power production on advancing and retarding a camshaft is just not knowing where the proper intake and exhaust event need to be.
Folks that have never tried it just don't know.
The 350 is out of a Chevelle so I'm not familiar with the emmission standards on them. Also the engine will be going in my 1984 Cutlass that would see 5,000-5,500 rpm. But the cam you just desribed is the exact same as my cam, is it a reproduction of it?