It's in a 71' Duster 4 speed and he hasn't had it at the track yet but did do a chassis dyno and it did 371 hp and 410 ft lbs. Hp was at 5510 and tq. was at 4030 rpm's.
To stroke or not to stroke... That is the question.
- Thread starter BDL
- Start date
- Local time
- 5:24 PM
- Joined
- Dec 4, 2009
- Messages
- 36,530
- Reaction score
- 48,831
- Location
- Pasadena, Texas
And different dynos will show different numbers too but track results don't lie so long as you have good traction. On the other hand, that 'A' body should run pretty good with it....
Frank Mopar
Well-Known Member
The fact that nobody runs poly motors should tell you something. If you got 5 grand to blow dont waste it on that motor
BDL
Well-Known Member
One of the major costs associated with my poly is the EFI. I won't settle for less, at this point. I'm just done with the carb (not trying to raise this as a point of argument or even discussion... I know there are just as many die-hard carb guys as there are EFI guys and I'm not here to step on anyone's toes on that
). Given that fact, I seriously don't know how a person could throw a cheaper engine together that could match the flat torque curve of the Poly. But, for sake of argument, take that efi off the table and the cost is now down to around 3800 to build the poly.Say, for instance, I wanted to run a 5.7 Hemi. By the time I buy the engine for 1500, bolt some updated heads on for 700, stab a new cam in for 400, buy all different accessories (alternator, ps pump, new water pump, gaskets, etc.) for 400 and add an aftermarket mpfi controller... I'm at 5k again.
If I robbed a $600 big block from an RV in the junkyard, I'd dismantle it and send it to the machine shop the same way as the poly. Then I'd have virtually the same costs as the poly to add on after that. Yes, I might have better hp and tq numbers, but wait... I'd also need a different transmission. Grr. Every change leads to another expense.
There are so many costs and opportunities to consider when changing a motor... It's mind boggling.
Frank Mopar
Well-Known Member
The difference is when you spend all that cash on a poly motor you will still have a poly motor. You could go with a hemi for $1500, leave it alone and be mile ahead plus you will reek of the cool factor.
MOPOWER871
Well-Known Member
Stroke it you'll be happy you did. poly is a cool motor. different, poly is probably 100 lbs lighter than a 440 anyway.
BDL
Well-Known Member
I agree with the cool factor of sticking with the Poly. For this car, especially. You see... It was my Grandfather's car and has been in the family since the day it appeared at his dealership back in '66. My Great Aunt originally bought it and then traded it in on a new Charger when the new model came out in '68. Grandpa kept it ever since. Even though I've considered all sorts of different engines as replacements, I keep coming back to the fact that the original engine would end up sitting in the corner of the garage. I can't stand that idea. So, I just need to figure out whether to stroke it or leave it un-stroked (if that's a word). I'm leaning toward stroking since I haven't heard any arguments against it.
fastmanefi
Well-Known Member
I'd suggest a Holley Sniper for that motor. Great system.
BDL
Well-Known Member
I'd love to know more about the Sniper! Have you used it? What all needs to be purchased in order to get it to work?
fastmanefi
Well-Known Member
Just for clarity: EFIexpert.com is my site for Holley, and fastmanefi.com is for FAST. I do both, and yes, I have been selling, supporting and tuning Holley for quite a while. The Sniper has been a huge success because it takes the Holley ECU down to the price of a carb. You should go to my site as well as Holley's to review.
https://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_4bbl_tbi_kits/
The only issue with the Sniper has been "getting it". The original demand caused a back log on deliveries; but Holley has recently doubled it's production capabilities so they are back on track.
I sell mostly the HP and Dominator lines because that's where my tech support and tuning expertise has some value. Of the several Snipers that I've sold they were up and running without my help. It is definitely worth your time to check it out.
https://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_4bbl_tbi_kits/
The only issue with the Sniper has been "getting it". The original demand caused a back log on deliveries; but Holley has recently doubled it's production capabilities so they are back on track.
I sell mostly the HP and Dominator lines because that's where my tech support and tuning expertise has some value. Of the several Snipers that I've sold they were up and running without my help. It is definitely worth your time to check it out.
BDL
Well-Known Member
Please excuse my ignorance. I've seen all these listed and I have seen pages upon pages touting how great each one is, but I have not seen a simple chart on what benefits each "system" gives over another. Is HP better than Dominator and are they both better than Sniper? What are the added benefits of one over another?
fastmanefi
Well-Known Member
I post a spreadsheet on my web site called "Selection Criteria" (under Products), that compares the systems. But in a nut shell the Sniper and Terminator are no laptop TBI (throttle body injection) and the HP and Dominator are for direct port injection. The Sniper and Terminator are for people who do not want to use a laptop. But one of the things that I really like is that you can use a laptop - even with the Sniper - if you want or needed to. The first no laptop TBI systems got a bad name because they were sensitive to low vacuum conditions and with some systems there was nothing you could do about that. Radical motor - no laptop TBI - ran poorly - you were stuck! But the Holley systems allow for manual tuning if you want or need to and the software is the same across the entire line. As an engineer I think this is a great approach.
A simple upgrade to to the V4 software with Holley and you can use a lap top, or it can be tuned by anyone that has experience in efi. Holley got their **** together when they came out with the Terminator system.
D
Deleted member 24629
Guest
BDL
Well-Known Member
That's exactly the type of "nutshell" description I need
Thank you! So, for this motor, I'll be going with either the Sniper or Terminator. Now, I'll take a look at the spreadsheet on your site to figure out what the differences are between the two. Personally, I DO want to use the laptop, but only because I'm also a computer guy. I want to end up with something that works well and is absolutely reliable. If one gives more flexibility, I want to know how. If the only difference is that one can handle more HP, then I'll leave that one for the guy who's chasing HP with his turbos and superchargers and so on (Although I'd love to have one in another car, this car will never see it!)
fastmanefi
Well-Known Member
That's exactly the type of "nutshell" description I need
Call me and we can discuss details.
BDL
Well-Known Member
I found this on another site... Are these points valid?
The Sniper EFI is an 800 CFM throttle body (vs. 950 CFM Terminator), and has the dual square-bore & spread-bore mounting pattern. The Sniper's much smaller ECU (with integrated ignition coil driver) is encased in the side of the throttle body, and can be laptop tuned with a Holley USB/CAN dongle (purchased separately). The Sniper's non-adjustable fuel pressure regulator (58 psi) is also integrated into the throttle body. The Sniper throttle body doesn't have the Ford C6 transmission kickdown lever. The Sniper EFI system is less expensive than the Terminator EFI.
Last edited:
fastmanefi
Well-Known Member
I have all systems there, but the differences from the Sniper and terminator are physical not electronic. again, call me to discuss.
Similar threads
