What do you think of my combo be honest

[siuauto]

I have 1971 Duster the engine is a 360 with a performer rpm cam What is your take on that cam. I have the same manifold a 650 demon carb 4 speed with a 8 3/4 391 rearend. The also has headers a MSD dist and box. I have roller rockers and Sure Seat springs. I would like to hear your thoughts on my selection. I don't know the compression because I have not had the engine apart. My goal is to have a high performance street car. I do plan on taking to the track and I would like to run 12's I don't care if it is 12.99. I am planning on puting subframe conectors and a adj pinion snubber. How close do you think I am?

 

[cudavert]

Post the cam specs......1.5 or 1.6 rockers?......650's a tad small, I'd say......oh yeah, heads heads heads......what are they?.......and which headers?.....

 

[siuauto]

Operating Range1500-6500 RPMDuration Advertised308° Intake/318° ExhaustDuration @ .050''234° Intake/244° ExhaustLift @ Valve.488'' Intake/.510'' ExhaustLift @ Cam.325'' Intake/.340'' ExhaustLobe Separation Angle112°Intake Centerline107°Intake Timing @ .050" Open 10° BTDC
Close 44° ABDCExhaust Timing @ .050" Open 59° BBDC
Close 5° ATDC
That is the spec for the cam. The heads are a 360 J head and I don't know much else about them. THe headers are 1 5/8 long tube headers
dojo.require("dojo.parser"); dojo.require("dijit.form.Button"); dojo.require("dijit.Dialog"); dojo.require("dijit.form.ValidationTextBox"); function validateEmailForm(){ var form = document.getElementById("EITF_form"); if (trim(form.EITF_input_yourName.value) == "") { return false; } if (trim(form.EITF_input_yourEmail.value) == "") { return false; } if (trim(form.EITF_input_recipientName.value) == "") { return false; } if (trim(form.EITF_input_recipientEmail.value) == "") { return false; } return true; } @import "http://www.jegs.com/wcsstore/dijit/themes/JegsTheme/jegstheme.css"; @import "http://www.jegs.com/wcsstore/dojo/1.0/dojo/resources/dojo.css";

 

[fishy68]

Even though you have a good gear and a 4 spdl. if the engine is stock compression it's not going to work good because all LA 360's were real low compression. Even the Magnum 360's were only about 9 to 1.

IMHO that cam is not a very good grind due to it's tremendous amount of total duration vx. the .050 duration and don't have alot of lift. Very lazy profile.

As far as the rest of the setup the suspension sounds good as long as you run drag radials or slicks. But you also need some decent flowing heads. What heads do you have and are they stock or??

 

[JoeDust451]

Even though you have a good gear and a 4 spdl. if the engine is stock compression it's not going to work good because all LA 360's were real low compression. Even the Magnum 360's were only about 9 to 1.

IMHO that cam is not a very good grind due to it's tremendous amount of total duration vx. the .050 duration and don't have alot of lift. Very lazy profile.

As far as the rest of the setup the suspension sounds good as long as you run drag radials or slicks. But you also need some decent flowing heads. What heads do you have and are they stock or??

I'll agree on the cam also, its too big for a stock bottom end 360.

But that cam will work great with the right heads/compression, low lift high dur. cams are much easier on the valvetrain vs. a "fast rate" lift cam. I like big lazy cams myself. The .509 is a lazy cam, but it kicks ***.

 

[74scamp360]

looks not bad. i think it kind of depends what compression you're running. i know we were at the drags this spring and there was this 69' 4 door dart that ran consistently at 12.75. he ran a best of 12.73 that day. we got talking to the guy later on and expected something special but he said he had a very mild 360, nearly stock, a 904 tranny and an 8 3/4 with 4:10s. mind you he did have fibreglass fenders and hood and the car had the back seats taken out but it's a 4 door so i'd say you guys would be nearly the same weight. i think the biggest thing is having a good setup, you don't always need crazy power just a set up that works really well together. o and he ran mickey thopmson dtreet radials so he wasn't on straight slicks, they technically are street legal lol

 

[cudavert]

How 'bout running that bad boy right now!?!.......

 

[moper]

I saw your other post... Seeing the details of the total package I would recommend something different. That cam will get you into the power range that will run in the 12s. Whether you can drive a stick car that well and run 12s is another question. I'm not trying to bash. I'm not that good witha stick so a car that could run 11s with Ronni Sox would run 12.60s with me shoeing it...lol. Now, if you are looking for a cam that better matches the package, and that will have a better dile and throttle response when you're driving around, I would suggest something slightly smaller on the duration at .050, similar in lift but less overall duration. The key to drivability and good torque is the right cam FOR DRIVING. Not max HP for the engine alone. The .509 mentioned is a great example. Great cam.. in the right package. A street car is not the right package 90% of the time. For what you are talking about, I'd run the XE274H Comp Cam. This one requires dual springs w/damper. Another thought for a cheaper install would be the XE268. Eitehr cam will make the power you want and be a decent driving cam. Then it's just up to your driving skills...

 

[siuauto]

Ok, I just got done flowing my heads, like said they are a j head and just finished flowwing them on the flow bench. I have a flowbench 600 and this is what they show. The valves are a SS 2.02 1.60 3/8 valvestem and the heads both have a 70 cc chamber. I think this is close to stock but I know they vary from head to head. THe intake 158cc and the exhaust 77cc. While I was play around I flowed my carb at it flowed 790 and the air speed was rally high. I out flowed my buddies holley 750hp. The pistons look like a stock piston and I found out it is standard bore. If I put a 10.5/1 pistons in do you all think I can make it in the 12's

 

[74scamp360]

yup, as long as it'll hook up you'll run 12's

 

[fishy68]

Ok, I just got done flowing my heads, like said they are a j head and just finished flowwing them on the flow bench. I have a flowbench 600 and this is what they show. The valves are a SS 2.02 1.60 3/8 valvestem and the heads both have a 70 cc chamber. I think this is close to stock but I know they vary from head to head. THe intake 158cc and the exhaust 77cc. While I was play around I flowed my carb at it flowed 790 and the air speed was rally high. I out flowed my buddies holley 750hp. The pistons look like a stock piston and I found out it is standard bore. If I put a 10.5/1 pistons in do you all think I can make it in the 12's

Sounds pretty close to stock on port volume and combustion chamber volume but what did they flow?

 

[siuauto]

Stock port volume is intake 149cc and 70cc exhaust and a 71 cc chamber. I have the flow numbers at work, I will try and post them when I get it. I am also going to post the carb flow numbers. I was really impressed with the 650 demon. Overall the heads look pretty good. I know the bowls have been worked on and the runners at least matched.

 

[moper]

Another thing to keep in mind... the flowing of the carb you did was only with air... no fluid. A dry flowed 650 should flow closer to 730cfm. If you tested at 10" and then converted to 28" that would explain the numbers you got.

 

[NorwayCuda69]

U say u have a set of J heads, i dont think they came out stock with 2.02 / 1.60 somebody had to change the intake valves from the original , are there bronze guides inserted? the only j heds with that setup was In 1971, the 340 came with the J heads and 2.02/1.60 valves. the 360 style had 1.88 intake exept the X heads that all had 2.02.. the reason i type this is that i have a set of j heads someon thought they have machined fo 2.02 only the bowl and port size wasnt changed at all.. u should check it. if the head aint a go and needs alot of worke, u have better use of a set EQ-monster magnums, they are cheap and flow god with minor mods... and best of all closed chamber for better compression.. and buy a thinner gasket

 

[rumblefish360]

I think that if you installed a set of zero deck pistons, you'll have the compresion needed to run that cam and the magic number of 12's. You'll come in around 9.8-1 with a set of KB-107's, a Fel-Pro .039 thick gasket and the J heads.

 

[siuauto]

U say u have a set of J heads, i dont think they came out stock with 2.02 / 1.60 somebody had to change the intake valves from the original , are there bronze guides inserted? the only j heds with that setup was In 1971, the 340 came with the J heads and 2.02/1.60 valves. the 360 style had 1.88 intake exept the X heads that all had 2.02.. the reason i type this is that i have a set of j heads someon thought they have machined fo 2.02 only the bowl and port size wasnt changed at all.. u should check it. if the head aint a go and needs alot of worke, u have better use of a set EQ-monster magnums, they are cheap and flow god with minor mods... and best of all closed chamber for better compression.. and buy a thinner gasket

I know these heads did not come with the 202, These heads came off a 73 360 I think, So I know someone has been in them already. Who ever was in them did a nice job, like I said earlier the bowls have been blended and the runners are ported pretty deep. I still haven't had a chance to post the flow numbers. Thanks for your input.

 

[siuauto]

I think that if you installed a set of zero deck pistons, you'll have the compresion needed to run that cam and the magic number of 12's. You'll come in around 9.8-1 with a set of KB-107's, a Fel-Pro .039 thick gasket and the J heads.

I was thinking of using those or the KB 190 10.5 -1 but I would like to still run 93 octane. I even thought about running higher compression and running E85. I have a lot of friends doing this but I think I am go to talk myself off that ledge and just run the 107's. You can't beet the price from Mancini.

 

[Mad Dart]

I had the exact cam in my 340, exact intake, exact Mighty Demon Carb. 4spd same gears. That car ran its asssssssssss offffffffff.

This is no joke!! Compression was probably a .50 pt higher than yours is though!!

 

[siuauto]

I think that if you installed a set of zero deck pistons, you'll have the compresion needed to run that cam and the magic number of 12's. You'll come in around 9.8-1 with a set of KB-107's, a Fel-Pro .039 thick gasket and the J heads.

I had the exact cam in my 340, exact intake, exact Mighty Demon Carb. 4spd same gears. That car ran its asssssssssss offffffffff.

This is no joke!! Compression was probably a .50 pt higher than yours is though!!

Great, thats what I want to hear.

 

[rumblefish360]

OH, I'd skip the snubber unless your haveing wheel hop issues.
Sub frame connectors are a good idea at anytime.

 

[Mad Dart]

OH, I'd skip the snubber unless your haveing wheel hop issues.
Sub frame connectors are a good idea at anytime.

Subframe Connectors, Rancho 9000's in the rear and CALTRACS..........

Forget the snubber! All together with the snubber defeats the purpose of the CALTRACS.

 

[siuauto]

great, I want to put Calracs on it. I have seen guys pulling front wheels with those. I guess now that winter is setting in I will have plenty of time to get it ready.
I guess there is one more part to my combo I would like help with. What clutch are you all running. Remember I want to drive this car on the street too.

 

[siuauto]

I think that if you installed a set of zero deck pistons, you'll have the compresion needed to run that cam and the magic number of 12's. You'll come in around 9.8-1 with a set of KB-107's, a Fel-Pro .039 thick gasket and the J heads.

Will have to have the rotating asseble balanced with these pistons? and can I get them in full floating. I have a set of rods from a 340.