Is there any relationship between the 2.3L Quad 4 and the 4.6L Northstar? I am talking about relationships that the Duke has with SBC/BBC V8's (pistons fit with slight mods, BBC rockers work, etc..)

What is the bore/stroke for each motor?

The Quad 4 is 2.3L, put 2 Q4's together and you get 4.6L, 32 valves, 4 cams, and 8 cylinders, sounds the same. The Auto LO Quad4 was 160HP, which would be 320 in in V8 form, pretty close to the Northstar.

The Quad 4 was used and then by the time the N* came out, they had a good head and block design. Knowing GM, they probably used alot of knowledge and design used on the Quad4 on the Northstar.

AFAIK, the northstar and quad 4 share no interchangeable parts. The northstar was developed completely seperate from the quad 4. That being said however, there was a prototype quad 8 made, and quickly destroyed thereafter. Maybe someone will post pics.

Northstar was a clean-sheet design. Obviously lessons learned from the Q4 were applied to the Northstar, but the N* is not built or designed from two Q4's.

------------------
'87 Fiero GT: Low, Sleek, Fast, and Loud
'90 Pontiac 6000 SE AWD: None of the Above

Luck, Fate and Destiny are words used by those who lack the courage to define their own future

just for shizzles and giggles:

As I said at the meeting the northstar is not two quad four's stuck together.

But I'll bet that quad 8 was a screamer....rev...rrreeeevvvvv....RRRREEEEEVVVVVV.......Weeeeeeeee!

:drools:

A few things from the Quad 4's give you an Idea what the N* can do. Lets just say that the Q4 HO W41's peak output is about 190 HP. The N* has the same bore, same stroke, same compression ratio and many other various Improvments. So I think if you had N* cams ground to match Q4 HO W41' you could double 190HP and then some due to having shared components. Lets say that you could easily get 400 out of a N* Naturally aspirated, and still get reasonable gas mileage and pass the smog test. Anyone here think that this would work?

I wouldn't discount some part interchangeability within the Q4 and the N*, and even the 3.4 DOHC. They all use almost the same lifters AFAIK and all have a 3.622 bore. Perhaps there is something there...

quote Originally posted by Fierobsessed: A few things from the Quad 4's give you an Idea what the N* can do. Lets just say that the Q4 HO W41's peak output is about 190 HP. The N* has the same bore, same stroke, same compression ratio and many other various Improvments. So I think if you had N* cams ground to match Q4 HO W41' you could double 190HP and then some due to having shared components. Lets say that you could easily get 400 out of a N* Naturally aspirated, and still get reasonable gas mileage and pass the smog test. Anyone here think that this would work? I wouldn't discount some part interchangeability within the Q4 and the N*, and even the 3.4 DOHC. They all use almost the same lifters AFAIK and all have a 3.622 bore. Perhaps there is something there...

Northstar has a 3.66 bore. Also, port and polish the northstar heads, and throw in some 288* cams from CHRfab, and you've got your 400 horses N/A. I think it will lope, and it may not pass smog though.

Quad 4: 92 x 85 mm, 147.5 mm rods
3.4 TDC: 92 x 84 mm, 144.8 mm rods
Northstar: 93 x 84 mm, 151 mm rods

I'll have to look into the lifter thing, because I haven't found specs on that.
I'd like to find head flow data on the Q4 as well...

------------------
'87 Fiero GT: Low, Sleek, Fast, and Loud
'90 Pontiac 6000 SE AWD: None of the Above

Luck, Fate and Destiny are words used by those who lack the courage to define their own future

D'oh on the bore thing, was pretty sure they were the same...