I have an RB 493 CI 6 pack stroker in my road runner that Nick Wilson built for me about 4 or 5 years ago. The intake had a stage II porting done by Hughes and it made 734HP at 6,950 RPM and around 640 foot pounds torque. THere was a thread from back then where I posted the dyno sheet if your interested.

Paul

I'll keep that intake in mind - thanks!
My only constraint is it has to fit under the shaker really. I forgot about spacing the K, I did that on my Demon to clear the Indy intake and totally forgot about it till now.
It does not have to be a RB Block
If you have the link handy for your 493 build Paul I'd be interested in reading it.

Thanks,
Rick

I figure my 511 six pack is well north of 600. It's been 10.90's at 4000# ( me in the car) running through exhaust and is nothing trick. Even has 50 year old gtx leaf springs. I'm sure more compression, camshaft in a lighter well set up car could really take it up a notch.

I did not think there was enough material for stage II porting on any six pack intakes with out modifying the runners and adding material on the top side of the runners for the larger ports.

I put a low deck (400 block) 6 pack pump gas stroker motor together using a stock unported Eddy low deck six pack intake with stock type 440 carbs, the motor was 517 C.I. (4.375 bore x 4.300 stroke) with 10.29 to 1 compression with a set of Eddy RPM heads CNC ported by MCH, Comp Cams custom ground solid roller cam that was 260@.050 on the intake with .420 lobe lift and 266 @.050 on the exhaust with .409 lobe lift, Harland Sharp 1.65 ratio roller rockers that netted .700 at the retainers with checking springs.
This motor combination ran a bunch of 10.30 at 127.6 MPH through the 3.0 inch exhaust system on with a stock 6 pack air cleaner with dual stacked stock 6 pack Fram air cleaner elements in my 1971 Duster that weighed 3450 lbs. with me in it
IHTHs

Thats respectable. What do you spin that thing too Cab?

I shifted at or above 7000 RPM after testing a bunch different shift RPM
I dyno tested that motor several different times on several different engine dynos, two different DTS and s Studka dyno, that motor made peak HP at 5500 and 5600 RPM with the six pack and it made peak torque at 4500 and 4600 RPM, depending on which dyno
I tried shifting it at 5500 RPM and then 6000 RPM, it ran faster at 6000 RPM so I then tried 6500, then 7000 and then 7500 RPM, it ran quicker and faster the higher I shifted that stupid motor I got scared of it above 7500 RPM so I decided 7000 to 7300 RPM was good enough for me It would repeat ET real well at those RPMs
That was a good car, lots of fun, especially on the street

Single carbs are too passé
Build it BIG!

Rick, I barely know how to log in, don't know how to do a link but the post was from 06/07/10 in this forum.

Paul

I just pulled out the invoice from Hughes and it says Stage II porting. From the outside there was definitely no welding or material added.

Paul

Best et 6.27 at 3600+ pounds
Around 720hp. Just a smidge to tall for a shaker. Drove this car everywhere

OP, this is the first tunnel ram six pack intake I've ever seen
Mechanical carbs also
Not a Weiand two piece SS or stock Eddy dual plane OEM intake

Ray better add some more pics of that intake before Cab's head implodes from curiosity.

Thanks Paul!
Ray- what was the test of your combo that it made 720?

did you ever put any passes on this combo?

Unfortunately no, I would have had to drive to Norwalk and could never make it happen with friends, schedules, etc. Now I'm happy just going for rides around town.

How bad does it knock the tires loose on the street

493. EZ heads MW port. Roller cam .630 265. 12-1. 185 cyl pressure. 9" converter. 3.55s with 28 or 4.10s with 30 tires.
I had 3 500 cfm carbs. Center carb was 4412 i modded

Thanks Ray, looks like a nice combo.
So...this may sound retarded and I know there will be a myriad of answers but why did you guys choose the heads you chose? I look at the combos that are scattered around the internet and some guys use a Indy EZ, others a SR others a ??? What I mean is why stop there- why not say a 440-1 or larger? Is it that the ports are too large to be a efficient head for this power lever, pure overkill, a big price jump, or that other required parts to go with them becomes a little exotic or ???
I'm just sitting back looking at my original plan and saying why not go 440-1's or big easy with a modman that will fit them with EFI, on something like 570" 11.5-1, and a stick around .700 274-282. What are my plans biggest flaws?