I fear this has been asked before and ask for forgiveness for asking what may have been asked again and again, but I do think I will have a few new twists.

I am building a 350 to pull a 93 Chevy Custom van.

My aim and understanding is to build it for max torque at 2200RPM and gear to run at 80% of that peak at cruse, which here in AZ can be around 80MPH.

For research I am looking for dyno runs of 80s and 90s 305s and 350s so I can see a base line.

I keep reading factory manuals that state of torque peaks at 2200 RPMs and HP peaks at 4800 RPMs, and wonder if these are correct.

My problem is to keep power range in the lower RPMs, mainly stock.

At the same time improve it for power and mileage.

As I understand it the early Chevy heads are mainly junk, and need a lot of work.

I was going to run the 90 TPI Swirl Valve heads, but find they need some clean up…and have read a lot about how Great the Vortec heads are.

Great but at what price (other than cost and having to but a new TPI Base..)

Everything reads well even the notes of the upper RPM limits, as I am not building a Hi RPM power motor but a Hi mileage motor.

So some dyno runs of these New Heads on a stock 80s 350 with TPI would be a big help.
And any info on using them and the results would be a help.

And real world compression ratios and how they worked out would also help.

I am working under the idea that a super clean blueprinted 350 running Vortec heads and a 89 TPI system will make about 40% more power, torque, HP and Gas mileage than my 93 stock Van motor with its TBI system and swirl port heads.

Yes No??

Thanks

Rich

 

Why don't you PM Fast355. He seems to be the expert on Chevy vans. He has tons of posts here.