My new motor is finally starting to come together, so I figured I'd give you guys a preview.

It's a 377, built with a new block and 383 rotating assembly from SDPC. Flat top hyperuetectic pistons, Scat I beam 5.7" rods, Scat nodular iron crank. Lunati cam, .489 lift w/1.5 rockers, 268/279 duration. Still deciding on heads, either Holley systemax or possibly Canfield 200cc, or Pro Action Iron lightning 200cc. Edelbrock Performer Rpm Airgap intake. Will be using a built 700r4 from Pro Built Automatics w/ a 2600 stall. I will probably use a 454 TB until I get money for something better. Anybody have any suggestions on what TB and size injectors, or complete FI system I should use?

Also trying to decide on a rearend or parts for the one I have.
This motor with the ProAction heads made 470hp and 500tq, and with the holley heads, 415hp and 450tq on Dyno2000.
Anything I have forgotten?

 

I vote on Victor Jr intake and 454/670 TBI

 

Depending on the heads and if this car was going on the street or strip would determin the heads/intake system.
I'm going to assume you'll keep it on the road so I will be completely honest when I say don't go with the GM ecm and 454 TB. Only go with the 2" TB unit if you are going to spend the time and money tuning. You'll NEED 90# BBC injectors with cranked fuel pressure to support 470hp. That's pushing the limits.
If you want my advise, I would go with the holley 4 barrel 4Di projection system with either the 750 or 900cfm TB. These systems provide an easier to tune system and it's more hands on and simple. The GM ecm is more complicated because of it's complexity. The GM ecm has many advantages like closed loop, highway mode, many variables for adjustments, torque converter lock/unlock perameters etc. The list is pretty long BUT what hurts it is the actual eprom and no realtime tuning can be done. You can't just plug in a laptop and tune. You need to datalog, figure what you need to change, change it with software, erase, burn new eprom, reinstall and start over the process until happy.
ALso the GM ecm was never designed for a big motor in a light car. If you have the knowledge it isn't hard to get around this but if you don't want to spend timing learning how to tune EFI then go with the Holley projection. It's a trade off, the holley system costs more and you might not have all the goodies but it's definatly an easier system to get the car from point A to B. If you've got time and WANT to learn how to program your own eproms the diy-eprom board is a huge heep of information. Grumpy is back from the hospital and there are tons of peeps that will coach you in the learning process. It took me a couple months to get the hang of it but I didn't have the time to read ALL the articles. Over the summer I printed out a bunch of the information and read it before bed. Now I know a LOT and now need time to play with my car.
Hope this helps.
Oh yeah, and if you definatly keep TBI, go with the victor jr intake no matter what heads. If you plan on going to a carb then go with the RPM. My vote is for the AFR 195cc heads

 

ah darn. I saw 377 and thought you meant 3.48 stroked 400 block. Which is what I want to build next time I get around to building a serious chevy. actually a 348 would be the coolest but a little more expensive and complicated.

 

The car is a daily driver, and despite the large amount of power, the powerband is very streetable, I'll see if I can find a file to attach.

I was looking in the holley catalog at that system, are you talking about the one with the injectors over the TB? I was kinda thinking that if I switch ECM's and complete system's I might go with a multiport system. One day the car will be super or turbocharged, so wouldn't the injectors over the TB be a large restriction?

As for right now, I think I will go with the 454 TB and the biggest injectors I can find, with an Ed Wright chip, just so I can get and hopefully, keep it running.

BTW, what's wrong with the RPM airgap? The powerband of the engine is actually very mild, and the airgap complements it.

377 CID Stroker with Holley Aluminum 2.02/1.60 180cc 69cc heads

RPM HP TQ IMEP Pressure


2000 169 443 229.9
2500 218 459 227.7
3000 265 464 227.2
3500 313 469 226.5
4000 357 469 226.2
4500 391 456 222.9
5000 411 432 214.5
5500 405 387 197.4
6000 381 334 177.2
6500 351 283 157.9
7000 304 228 136.9
7500 262 183 120.5
8000 209 137 103.6
8500 149 92 87.3
9000 87 51 72.8
9500 20 11 58.9
10000 0 0 46.8
10500 0 0 34.2
11000 0 0 23.3

 

to top