Technical What intake and carb set up to use on 99 mercury stroker engine

i jave recently completed a build of my 99 Mercury engine, specs as follows:
Bore 3-3/16 + 0.125"
Pistons arias forged 3 ring
Stroke mercury 4" stroke crankshaft offset ground to 4-1/8"
Rods 21A ford NOS with standard full floating bearings
Large valves chev
Adjustable hollow lifters
Potvin 3-8 cam grind on original 59a cam
All rotating assembly balanced

I have a choice of fuel systems (inlet and carbs) and I am looking for some guidance
on which of the following intake and carb set ups to use:
Edelbrock super duel 2x2 stromberg 97's rebuilt
Edelbrock high rise 3x2 stromberg 97's rebuilt
Fenton 2x2 rebuilt Holley 94's
Weiand 3x2 rebuilt stromberg 97's

 

You haven't indicated street or race so I think you are going to get a some conflicting advice on this post and you might need to do some research and googling on engine displacement and carby size to make sure you are happy.

Whilst 3 x 3 look very cool unless you are racing it, then my understanding is that 3 x 3 is likely overkill for the street. You can of course use progressive linkages to tame it but a bit more difficult to tune.

From the research I have done 2 x 2 is a good combination for the street and motor cubes

 

Thanks for your response. The car is being built for street use and according to my calcs the displacement is 284ci. What I am looking for is the ideal inlet/carb combination for this build. I have a choice of 3x2 or 2x2 inlets and either Holley or stromberg cab set ups. I can't find any data on the weiand or Fenton inlets so hence my dilemma. Any further thoughts appreciated. I have progressive linkages on each of the 3x2 inlet structures.
Regards David

 

HotRod network work has a good article comparing different manifolds and carburetors where the test engine has similar displacement. This may be of interest.
https://www.hotrod.com/articles/hrdp-1301-flathead-ford-intake-manifold-smackdown/

 

Great reference, patterg2003!
Mike

 

Thanks for that link!

 

The truth is there is so little difference between manifolds performance wise that it boils down to what look you want.
If you choose the super duel style you will be forced to move the generator off to the side or run an alternator. Neither option does not look very traditional.
If you use the standard style the generator stays on top of the engine which looks more original.
Your choice.
2 carbs vs. 3 carbs boils down to tunability. 3 can be a pain.

Sent from my SM-J727V using The H.A.M.B. mobile app

 

My 99 engine is bored 3-3/8 with a Merc 4" crank, two 97's on a highrise Weiand. But mine needs more cam.

 

amazing that victor's slingshot still works so well!

 

Thanks to all for your advice and feedback. I will start with 2x2 and see how I go. David

 

John Lawson's book "Flathead Facts" is worth a read. Dyno runs with different carbs and manifolds Has answers to many questions.
Garpo

 

Most flat heads don't need 3 carbs but with progressive linkage 3 carbs probally give better fuel distribution

 

" I will start with 2x2 and see how I go"...I suggest starting with a triple and a block-off plate. Then you can experiment freely without going bankrupt. I'd suggest an old Edelbrock or Offy...the new ones have ...things...that annoy me, aside from not being old. Look for one with heat (see Lawson's book!!), and I don't see why a triple linkage would not work when experimenting as dual.
Your engine is actually fairly big as flatheads go.
The dual is a no-brainer, should definitely work well. On the triple experiment start with the linkage adjusted solid for fulltime, then drive it. If there is a major stumble, readjust linkage for some delay, if minor linkage try some tuning or just program your right foot a bit.
Use '42-48 types of distributor, with brake set towards loose end. Most multi carb air cleaners are garbage, working as chokes, tune with no aircleaners, then test them on there. You need the cleaners, but the easy choices are mostly garbage...