A built 350 will rev to 7k all day long. What will a 383 (forged internals) spin to...safely...in a daily driver? I know the 3.75" stroke will make it harder on the engine though. Thanks

-Corey

 

Depends how well it's built. I have spun 3.75" stroke motors to 6500 many many times (383s and 400s). That's with nothing more than good rod bolts and good machining on otherwise stock bottom ends.

 

As long as you used good parts, bolts, and a good set of main caps, I don't see why a 383 wouldn't spin as high as a 350. I also don't see the need to spin a motor that high since you'll most likely stop making power by 6500 RPM (more likely 5800-6200).

 

Awesome! I'll be running a heavily TPI setup so won't be shifting much past ~5500.

I've got a $100 '91 Chevy Van long block lined up. I'll get new rods/pistons and probably the crank turned so mine as well get a new 3.75" one.

As far as heads, Pro-Topline? What's a good runner volume? I was thinking 180 but maybe 200 since it's a 383.

Cam, LT4 Hotcam? If not, what duration/lift/LSA should I be looking for? That about sums it all up. Thanks!

-Corey

NOTE: This engine has to be emissions legal.

 

383 and larger engines can swallow a 200cc intake runner no problem, in my expereince, if they are designed to "breathe" in the mid-upper RPM range. Extremely low RPM torque (below 2400) will be compromised vs. smaller runners but you probably won't be spending much time down that low.

Cam choice can vary depending on your intake setup and intended application. Lots of guys smarter than me when it comes to picking cams for stock and modified TPI setups. General wisdom for a street TPI is keep the duration relatively short (less than 215* @ .050) and LSA relatively wide (114*, give or take)

 

ditch the tpi and go for a hsr intake or a mini ram... you'll make more power than you think if you replace the tpi. i'd go with the mini ram, but the hsr is a little bit cheaper. might as well do it right the first time so you dont have to do it again later

 

If you want to keep the stock (read: fully ported) TPI setup, go with 190cc heads. If you go to a Miniram or HSR or even carb get something with bigger runners (195 or 200cc) that will complement the higher intended RPM range. Then call Crane and tell them what you have and let them recommend a cam. They're usually very good at it.

 

I'd absolutely LOVE a HSR but here in good 'ol Mooresville NC we have emissions My dad told me stories about back in the day that inspections places might let you slide, think I could get away without EGR and whatever else makes the Stealth Ram illegal? Oh, and the Miniram is just way to expensive.

Corey

 

On my 383 I'm using a set of Dart pro 1 heads that originally had a 215cc port. Anyhow, I went with a MPFI setup that looks like an old 4 bbl carb. Here's the links to them if you're interested.

http://www.holley.com/HiOctn/ProdLin...901-101-1.html

http://www.holley.com/HiOctn/ProdLin.../9900-174.html

I think they should work pretty well if I ever get to start the thing, still building headers. One day.

 

Idea for HSR: use a Ford EGR (the kind that doesn't mount directly to the intake....it has pipe thread ports.) You could put a T in the O2 bung and run a pipe up from there to the EGR and then use brass fittings to plumb the EGR into like the brake booster vacuum port or PCV port or something. It may not work but it's an idea.