Hey guys,
I'm building a 70 Monte Carlo and putting a TPI unit on my 350. Backing it with a 700R4 (27 spline) with a stock stall and have a 12 bolt 3.73:1 Posi. I came here because ThirdGen seems to have some of the best info for the TPI system... And wanted some opinons if this will be a good daily driver combo and still have enough to have some fun. I'm not looking for a 11's or 12's, already went that route with this car before. Just looking to have a nice driver that can hold its own and still get respectable gas milage.

That being said. Heres some of the parts:



Cam: Erson TQ-20: Hydraulic flat tappetHeads are Iron GM 441 Casting with 2.02/1.60 S.S. valves, screwin studs & Guide plates, was gasket matched to a Team G Manifold so I'll be gasket matching the TPI Manifold as well.

TPI unit is a 89 unit and converting to Speed Density, 730 ECM

24lb injectors

Disty is from a 91 TBI RS as well as the Belt drive system

Hooker Compition Long Tube Headers and full 2-1/4 exhaust with "turbo" mufflers.

Questions:

With that cam do I really need a performance chip? or burn my own, Obvisouly, I have to get the VATS deleted as well as the EGR, CCP, and AIR. Any sugustions?

Will I need a small stall converter?

Are the 3:73's too much? The car weighs around 3600 lbs. It's unlikely this car will see the track very often. Just the street. Oh and the suspension just got all redone with Poly bushings, 2" lowering springs and 33" ladder bars...

Comments, sugustions or am I just ???

Thanks,
Steve

 

Is that cam designed to be used with fuel injection or carb?

 

That's an old carb cam. Toss it, it's wrong for your application.
1970 Monte, 3600lbs? You sure? I thought it's heavier then that, those cars are MASSIVE. Didn't they have the longest hood of any production car?
Kinda makes it a non TGO question then doesn't it?

I don't think you'll be able to gasket match the TPI intake to your heads, if they were opened up to match a Team G. Also, those heads and TPI are a bad match.
If you're planning on using a stock TPI intake, then that's a very very bad match to the heads.

 

Doesn't look like it with the 111 LSA.

I would go with a CompCam 260XFI H13 cam. Similar specs but more aggressive ramps, and 113 LSA.

 

It maybe between 3800 and 4000 lbs but I don't think any heavier than that. And yes it does hold the distinction of having the longest hood.... 6-feet...


The heads were gasket matched to the Mr. Gasket intake gaskets... I would think the intake could be opened up some to make it close...

Then the heads can you tell me why they are a bad match. I know they are 76cc heads but the are a decent flowing head and the have the 2.02/1.60 valves... Granted I was useing the heads with the Team G street Ram intake and a rather large solid flat tappet cam...(.496/.502 lift, 236/240 @ .050) I know that cam is totaly wrong for this appl.

But 111 lsa on the old school Erson would cause too many problems? What would I expect?

As I said I'm not making a race car just a nice driver... That I can still have fun with and enjoy... On a budget...

 

Those are large big flowing heads, good for that big cam that you used to use, and high RPM use.
They flow poorly at low lift, and have poor velocity. They don't have good mixing qualities for low RPM use. The TPI intake (stock) is best for high velocity small ports low RPM use (exactly the opposite of those heads). The ports on the intake (TPI) are quite small. I wish you the best, but don't hold your breath. Keep in mind that intake is a post 1987, and the heads are pre, so the center two bolt holes will need to be elongated.

That cams duration is small enough that the LSA probably won't be a big deal, but it will still be "tricky" to tune with injection. It won't want to work well. It's also an old school grind (hence the dirt cheap price you paid for it eh?). Slow lazy ramp rates, etc.

I think if you use an aftermarket TPI intake (stealth ram or the like), and a compxe262h-14 would be a better combo IMHO.

 

Thanks I was curios as to why the 441 heads would not be good. They worked great with the big cam... The small cam was the one that used to be in it years ago, Only ran it about 6 months, that I had put away wrapped up and coated in oil. So I thought I could use it.

Sounds like most of my parts are totally wrong for my plans, so I may have to go to one of my back-up plans... Just get a new GM Performance Parts long block... and put the TPI on it (Good/Bad?), I think these come with the Vortc style heads, or I can test my fab skills and get a LS1 or "Vortec" (5.3L LS style truck) engine from the junkyard and fit into it.

 

what long block are you going to use?

 

Looks like I would have to go to the 350HO from GMPP. or find a 350 TPI or maybe even a LT1 in a junk yard...

 

Here's a new question on my orginal set-up. Instead of going with a S-D setup would a MAF setup work better? Thanks in advance.