66 cuda/5.9 mag. Run 10s? Recipe?

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Budget mopar guy

Budget mopar guy

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So for those of you not familiar with my car I have a 66 cuda gasser project 4 speed that I’m putting a 5.9 magnum in. I’d like to break into the 10s even if it’s high 10s. My goal is to figure out power wise what I’m going to need to do to get it into the 10s. It needs to be noted that it is an early magnum (96) so it is drilled for LA HEADS so I will be running an La top end.

So far I have the short block I will be freshening up. Promaxx cnc ported heads. No intake yet but I had considered a tunnel Ram because ….. well gasser. I think I’m going to get a custom grind cam. No idea on specs yet. The car itself should be really light. It will have a roll bar legal to 10.5 but nothing in the way of interior other than seats and dash. Fiberglass hood will be a must. I cant say for sure what the weight will be but I’d imagine this car should be pretty light in my opinion.

I understand that gear and driver and whatnot plays into what the car will run. Let’s assume that all that is optimal. What kind of power do I need to make to hit 10.9/10.8. Ive seen multiple very simple 360 builds online with just 10.5 pistons and stock eddy heads putting out 420 up. I’ve also seen fully dressed street cars with stock bottom ends and eq heads run a high 11. My question is what will it take. Is this even possible with a stock piston . And n20 100 shot is not out of the question if necessary but ideally I’d like to make it all motor. The way I see it is the odds are kinda stacked against the setup but then again the car should be pretty darn light so I’m not sure. Any setups out there that are 360 that have accomplished this goal? Any info / guidance is appreciated
 
stroker.

but more than likely stroker and some giggle gas

or, a cubic **** ton of money and a totally scienced out motor with an absolutely dialed chassis.
 
Budget mopar guy said:
So for those of you not familiar with my car I have a 66 cuda gasser project 4 speed that I’m putting a 5.9 magnum in. I’d like to break into the 10s even if it’s high 10s. My goal is to figure out power wise what I’m going to need to do to get it into the 10s. It needs to be noted that it is an early magnum (96) so it is drilled for LA HEADS so I will be running an La top end.

So far I have the short block I will be freshening up. Promaxx cnc ported heads. No intake yet but I had considered a tunnel Ram because ….. well gasser. I think I’m going to get a custom grind cam. No idea on specs yet. The car itself should be really light. It will have a roll bar legal to 10.5 but nothing in the way of interior other than seats and dash. Fiberglass hood will be a must. I cant say for sure what the weight will be but I’d imagine this car should be pretty light in my opinion.

I understand that gear and driver and whatnot plays into what the car will run. Let’s assume that all that is optimal. What kind of power do I need to make to hit 10.9/10.8. Ive seen multiple very simple 360 builds online with just 10.5 pistons and stock eddy heads putting out 420 up. I’ve also seen fully dressed street cars with stock bottom ends and eq heads run a high 11. My question is what will it take. Is this even possible with a stock piston . And n20 100 shot is not out of the question if necessary but ideally I’d like to make it all motor. The way I see it is the odds are kinda stacked against the setup but then again the car should be pretty darn light so I’m not sure. Any setups out there that are 360 that have accomplished this goal? Any info / guidance is appreciated
Click to expand...
Index Racing (Engine Build and Tips/Tricks)
 
Last edited:
junkyardhero said:
stroker.

but more than likely stroker and some giggle gas

or, a cubic **** ton of money and a totally scienced out motor with an absolutely dialed chassis.
Click to expand...
junkyardhero said:
stroker.

but more than likely stroker and some giggle gas

or, a cubic **** ton of money and a totally scienced out motor with an absolutely dialed chassis.
Click to expand...
Yep, "scienced out motor with an absolutely dialed chassis."

My .02...

The big end is going to be interesting with all that air getting under the car, let alone steering at 125mph with a king pin strait axle under leaf springs.
 
Weight of car, gear ratio, tire size, please. Those things will need to be known before a power level is known.
 
Budget mopar guy said:
So for those of you not familiar with my car I have a 66 cuda gasser project 4 speed that I’m putting a 5.9 magnum in. I’d like to break into the 10s even if it’s high 10s. My goal is to figure out power wise what I’m going to need to do to get it into the 10s. It needs to be noted that it is an early magnum (96) so it is drilled for LA HEADS so I will be running an La top end.

So far I have the short block I will be freshening up. Promaxx cnc ported heads. No intake yet but I had considered a tunnel Ram because ….. well gasser. I think I’m going to get a custom grind cam. No idea on specs yet. The car itself should be really light. It will have a roll bar legal to 10.5 but nothing in the way of interior other than seats and dash. Fiberglass hood will be a must. I cant say for sure what the weight will be but I’d imagine this car should be pretty light in my opinion.

I understand that gear and driver and whatnot plays into what the car will run. Let’s assume that all that is optimal. What kind of power do I need to make to hit 10.9/10.8. Ive seen multiple very simple 360 builds online with just 10.5 pistons and stock eddy heads putting out 420 up. I’ve also seen fully dressed street cars with stock bottom ends and eq heads run a high 11. My question is what will it take. Is this even possible with a stock piston . And n20 100 shot is not out of the question if necessary but ideally I’d like to make it all motor. The way I see it is the odds are kinda stacked against the setup but then again the car should be pretty darn light so I’m not sure. Any setups out there that are 360 that have accomplished this goal? Any info / guidance is appreciated
Click to expand...
You asked about doing this on stock pistons. If you are keeping the stock pistons you will be stuck with around 9:1 to compression or less. Probably less since you are going to LA style heads with their larger combustion chambers. In this case, use nitrous.
 
Assuming (you DO know what happens when you assume, right?)
2700 lb car, plus 200 lb driver, and proper converter, rearend gears, and a 9-10"slick..... Wallace says you'd need 440 horsepower at the flywheel for 10.95.
Real world, you'll probably need closer to 500.
Good heads are a good start. Tunnel ram is a good idea if you can tune it. Solid roller will be a must. 11.5 cr with tye roller, to run on pump gas.
Personally, I would start with a stroker kit, to make 500 easier.....but It can be done with a 5.9, just harder.
Obviously, the lighter it is, the easier. 500hp in my car, 2500 with me in it went high nines, and a smart chimp could have put the engine together. Only custom part was a modified flat top piston.
 
Last edited:
Bobzilla said:
You asked about doing this on stock pistons. If you are keeping the stock pistons you will be stuck with around 9:1 to compression or less. Probably less since you are going to LA style heads with their larger combustion chambers. In this case, use nitrous.
Click to expand...
Promaxx heads are closed chamber
 
TT5.9mag said:
Weight of car, gear ratio, tire size, please. Those things will need to be known before a power level is known.
Click to expand...
The car is a work in progress so I literally don’t even have any of that stuff yet. It would make sense to build the engine and then buy the stuff needed to accommodate it. That’s why I said assume under ideal circumstances what kind of power levels have you seen That were 10 second capable. I’m trying to get ideas here.
 
Basically, if any of you guys can provide examples of cars and set ups that you’ve seen that have been able to run that number. I’m just looking for ideas and guidelines for things that have worked in the past.
 

Budget mopar guy said:
The car is a work in progress so I literally don’t even have any of that stuff yet. It would make sense to build the engine and then buy the stuff needed to accommodate it. That’s why I said assume under ideal circumstances what kind of power levels have you seen That were 10 second capable. I’m trying to get ideas here.
Click to expand...
Well, if the car weighs 3200 it needs 500 hp to go 10.90. If the car weighs 2200 it needs 410hp to go 10.90. That’s a wildly different small block. So the closer you can estimate the things I asked for the better chance YOU have of hitting YOUR goals. Guessing is the wrong thing to do here.
 
Engine power is only step one, of about ten.
Assuming an auto trans, you will need an expensive converter. And a well built trans (904), possibly with a brake. A great driveshaft, with good u-joints on both ends. A loop. At least an 8 3/4, with plenty of gear, and a clutch suregrip. A spool would be better. You might get by with ss springs, caltracs would be better, I'd run period correct ladder bars on a gasser. You'll need the biggest tire you can get under the car.
 
Budget mopar guy said:
The car is a work in progress so I literally don’t even have any of that stuff yet. It would make sense to build the engine and then buy the stuff needed to accommodate it. That’s why I said assume under ideal circumstances what kind of power levels have you seen That were 10 second capable. I’m trying to get ideas here.
Click to expand...
you need to think about overall package. building a motor and then trying to assemble a package around it winds up with a bunch of mismatched parts trying to fit into whatever ideal you had in mind and will most likely wind up a loser that you're fighting coming and going.

better to start with a bigger overall picture and a rock solid goal.

for instance your idea of wanting to run 10's is great, but like somebody said upthread is that 10.99 or 10.20 because that's a big difference. then you have to sit down and figure out what your non-negotiables are. does it have to be period correct? do you have to have [blank] speed part or [blank] rear end? does it does it have to look this particular way? because then you're going to have to build around those compromises.

as much as Caveman Urg say: big motor go zoom zoom! that's only one small part of the equation.
 
junkyardhero said:
you need to think about overall package. building a motor and then trying to assemble a package around it winds up with a bunch of mismatched parts trying to fit into whatever ideal you had in mind and will most likely wind up a loser that you're fighting coming and going.

better to start with a bigger overall picture and a rock solid goal.

for instance your idea of wanting to run 10's is great, but like somebody said upthread is that 10.99 or 10.20 because that's a big difference. then you have to sit down and figure out what your non-negotiables are. does it have to be period correct? do you have to have [blank] speed part or [blank] rear end? does it does it have to look this particular way? because then you're going to have to build around those compromises.

as much as Caveman Urg say: big motor go zoom zoom! that's only one small part of the equation.
Click to expand...
This: "as much as Caveman Urg say: big motor go zoom zoom! that's only one small part of the equation."

My .02...

Build the car, learn to set up the chassis, and run a slave motor that can be flogged. Once he has his "set up" figured out, buy a real TQ ($$$) and install the race power plant ($$$).

He should be able to get into the eleven second bracket on a slave motor for low $.

Success takes several seasons and some seat time...

I enjoyed reading Guitar Jones's threads on chipping away at the low E.T.
 
Stock 5.9 Mag and a 300 plate shot. The screaming definition of budget.
 
Budget mopar guy said:
So for those of you not familiar with my car I have a 66 cuda gasser project 4 speed that I’m putting a 5.9 magnum in. I’d like to break into the 10s even if it’s high 10s. My goal is to figure out power wise what I’m going to need to do to get it into the 10s. It needs to be noted that it is an early magnum (96) so it is drilled for LA HEADS so I will be running an La top end.

So far I have the short block I will be freshening up. Promaxx cnc ported heads. No intake yet but I had considered a tunnel Ram because ….. well gasser. I think I’m going to get a custom grind cam. No idea on specs yet. The car itself should be really light. It will have a roll bar legal to 10.5 but nothing in the way of interior other than seats and dash. Fiberglass hood will be a must. I cant say for sure what the weight will be but I’d imagine this car should be pretty light in my opinion.

I understand that gear and driver and whatnot plays into what the car will run. Let’s assume that all that is optimal. What kind of power do I need to make to hit 10.9/10.8. Ive seen multiple very simple 360 builds online with just 10.5 pistons and stock eddy heads putting out 420 up. I’ve also seen fully dressed street cars with stock bottom ends and eq heads run a high 11. My question is what will it take. Is this even possible with a stock piston . And n20 100 shot is not out of the question if necessary but ideally I’d like to make it all motor. The way I see it is the odds are kinda stacked against the setup but then again the car should be pretty darn light so I’m not sure. Any setups out there that are 360 that have accomplished this goal? Any info / guidance is appreciated
Click to expand...
I think you are a second too fast at least. My buddy Ed has a 372 stroker in his Barracuda and runs 6.90's (11.10 1/4's)

Ed Fox2.jpg
 
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