I am currently building a 383 Tuned Port for my car and was wondering if it would be worth it to get my TPIS base ported. The parts that I am using for the 383 are a TPIS Bigmouth and Large Tube runners with a 52mm throttle body, Bosch III 30lb injectors, AFR 195cc Cylinder heads, Comp Cams 224/230 .566/.569 112 LSA, Dyno Don 1 3/4" headers and a Flowmaster 3 in. catback.

 

Yes, it would be worth it. The TPI restricts a 350, so a 383 will certainly like extra porting. The more the better, and even then you'll be giving up peak HP. Be careful with a big cam. Lot's of guys running 383 TPI's run out of steam REAL early, BUT.....they make amazing torque. It's a trade off of sorts. However, if you have a cam that makes power up top, and an intake that makes torque down low, it doesn't matter what size engine you have, you're going to be mis matched.

 

I agree, that cam seems large for a long runner TPI. That cam is even big for a super ram IMO. My 383 started life as an old-school Lingenfelter 383. I've increased the compression ratio to 11.0:1, vastly lightened/knife edged/polished crank and a little 15lb flywheel. I'm still running the LPE CNC ported L98 heads and the LPE 219 cam. 219* duration @.050 and .525 lift. I am using 1.6 rockers.

With a long runner setup you're going to be done breathing between 4500 and 5000rpm. If I remember correctly Lingenfelter recommended a 212 duration cam with the long runner setups. I know that seems small, but those cams will operate in the RPM range of your intake. The bright side of this story, be ready for 500 to 525ftlbs. Built to his specs, Lingenfelter's 383 makes 360ftlbs at 1800rpm, yours will be similar.

I've had my engine together for a few years now and there is nothing like that much torque on the street. With my increase in compression, slight increase in valve lift, and hardcore light bottom end, this engine revs like lightning. It is very active in any gear at any RPM. It makes a stock LS1 (which is no slouch)feel like a 90hp 4cyl. its fun to have that much brute force with a mild idle and bulletproof reliability. The engine belongs in a dump truck, it's a blast in my 3100lb 'stick shifted thirdgen. I'm sure yours will be too.

 

Absolutely on porting.

 

"Absolutely on porting"

Dittos. By the way Ron in the above post might be able to do it for you. I would have also mentioned Dr J but his business has taken off so I don't think he is doing any TPI stuff right now.

 

I sent Dr. J an email earlier but he hasn't gotten back to me yet. What kind of power gains could I expect from getting the intake ported? Would they be a descent amount or nothing to really talk about? I didn't really think that the cam that I picked would be too large for a long tube runner intake on a 383 and also with the fact that my compression is going to be somewhere around 11:1.

 

Thanks, GTA

Yes it will help. That base is restricting those heads didnt catch what runners youre using?

Actual power gains would be hard to say without hard evidence. Strokers have an appetite for air so anything you could do (if done right) will totally be worth it. Even the aftermarket base was made for the avg 350 with a (guessing)avg 240-250cfm aftermarket head which was a big deal back when these intakes were introduced. Opinions may vary

 

Dr J jus finished porting my SR runners, Edelbrock intake, and my brodix heads. He's busy as hell. But will still do TPI stuff. He should be sending them back to me tomorrow.

 

Heard he flows most of them, did he do yours?

He does fantastic work...pricy but you get what you pay for. Nothing good is cheap lol

Pics man!

 

I am using the AS&M/TPIS Large Tube runners. Any cons to getting the intake ported such as torque loss down low or anything like that? I have heard that Dr. J does good work but is pretty exspensive. There are a few people on here who do it as well. Has anybody had 385in2005 do work for them?

 

No torque loss runners are too long for that unless you were to cut them open and butcher them to death or the base. At that point just get a short runner intake.

 

I have seen people saying that they could make these bases flow around 320cfm. Would that be enough for my combination? How much would that change the powerband?

 

Not with simple porting (320 cfm), those ones you hear about are cut open welded and cut up pretty thoroughly $$$$$$

 

Would that much flow be needed or would a ported aftermarket base do just fine?

 

Im no expert just been doing it for fun and help with bills for some yrs but imo do an agressive job on an aftermarket base along with some runner work and, bang for the buck probably the best route. Call it a day.

 

"Any cons to getting the intake ported such as torque loss down low or anything like"

On an 408 motor with a SuperRam I worked over the runners and shortened them by siamesing and it picked up torque and horsepower everywhere in the power band. It is all about cylinder filling.

 

Those intake manifolds with the 300+CFM have weld added to them and the ports opened up quite a bit. I just spent around $300 having weld added to the one I am working on for my car. Might have to add some more weld once the porting begins. Still waiting on the welder to weld up my long tube runners.

 

How much could it be made to flow with out having it cut up and adding weld to it?

 

I did an Accel without welding etc and it flowed 292cfm on port 1.

 

OK, so I have decided to my get base ported and I am thinking about having dr j do it for me. He has still not gotten back to me on a price yet. How much did he charge you to do the porting to your base (cutting up and welding for the 320~cfm)? How long of a turn around time should I expect?

 

Try here...

https://www.facebook.com/pages/High-...62540657151556