Couple of questions about Stock

68Mustang · 11-07-2008, 10:09 AM

I am a bracket racer only run 1/8th mile only been racing for a couple of years. I'll admit i don't have a wealth of knowledge but trying to learn more everyday.

As i understand Stock is suppose to run stock heads, intake, and carb, right? The cam has to have stock lift but any duration and lobe seperation that you want, and a lot of ET is found through the car not just the motor. I know that most heads aren't "stock" but still they obviously don't have great flow numbers. I know no one is going to give away all their secrets and i wouldn't expect you to but hoping you could give me some general answers. looking for some answers about cam selection.

I run a 393 a 351W based stroker with a set of Edelbrock RPM heads which only flow about @250 at .600 I knew the heads were small when i put the motor together but money was tight and i got them for a good price. I was told buy several people since the heads were small and i was feeding 393CI to keep my cam selection fairly mild. Was told as bracket racers with low horsepower motors we should try to make up as much ET as we could in the first 330 ft and you do that by making as much torque as possible, and that a "big" cam would hurt me.

I have talked to several Stock racers they told me basically they try to make their cars run as quick as they can the first 330ft and that the cars are basically done @1000ft. But from what i gather the run fairly big duration cams.I basically see my car is a stock eliminator i am head restricted and trying to run as fast as i can, same principle as stock

So here is where i am confused if we both are basically trying to do the same thing and people told me to run small duration cams and Stock racers are running large duration cams. How are we doing the same thing, who is right, which approach is better. Is it because stock is limited on the lift that the have to run a bunch of duration to make up for it, and since i can go up on lift that i can get away with less duration.
I'm wondering if my car would run faster with more duration or would i slow down
I hope this all makes since, and some one can clear up the confusion for me.

Chris1529 · 11-07-2008, 10:39 AM

what camshaft is in your car now? What RPM do you run?

68Mustang · 11-07-2008, 01:02 PM

Right now I have a hydraulic flat tappet 239/247@50 541/565 106lsa.
I have the shift light set at 5900.
The motor is 10.6:1
1 5/8 headers
3200w/driver
8" ATI flash @5000
4.56 28x10.5 bias slick
Went a 1.468 6.931 98.4 MPH the other week.

Greg Hill · 11-08-2008, 10:10 AM

Bigger cam, bigger headers, more gear, higher stall, higher rpm.

greg

trmnatr · 11-09-2008, 05:39 PM

Quote:

Originally Posted by 68Mustang

Right now I have a hydraulic flat tappet 239/247@50 541/565 106lsa.
I have the shift light set at 5900.
The motor is 10.6:1
1 5/8 headers
3200w/driver
8" ATI flash @5000
4.56 28x10.5 bias slick
Went a 1.468 6.931 98.4 MPH the other week.

I would start with 10° to 15° more duration and i think you may want to consider a 104° lobe seperation, go with an aggressive lobe, good springs such as Manley NexTek {available for solid, hyd, and rollers} springs and titanium retainers

Greg Marshall · 11-10-2008, 08:47 PM

I run a 418 cubic inch windsor stroker 10.5 compression motor with World products heads which
flow 265 at 600 intake and 210 exhaust . With this combination and a 691/668 272/280 at 50 Lunati
roller cam in a 2880 lb car with 430 gears i had a 1.35 60' and the car went 10.03 1'4 mile at 133 with a small amount of moroso mechnical throttle stop (4 turns) shut off . I believe the 1/8 mile speed was 107
this was behind a C4 automatic

68Mustang · 11-11-2008, 09:36 AM

Hey Superstreet what are you shifting at and how much converter do you run.

Greg Marshall · 11-11-2008, 04:04 PM

i shift at 6100 rpm which is where max hp is made. Converter stalls at 4500 rpm (8 inch TCS model) max torque is 540 lbs at 4300 At this point the car still has too much converter slippage and would have more
mile per hour.

11-07-2008, 10:09 AM	#1
68Mustang Junior Member Join Date: May 2005 Location: Virginia Posts: 47 Likes: 0 Liked 2 Times in 2 Posts	Couple of questions about Stock I am a bracket racer only run 1/8th mile only been racing for a couple of years. I'll admit i don't have a wealth of knowledge but trying to learn more everyday. As i understand Stock is suppose to run stock heads, intake, and carb, right? The cam has to have stock lift but any duration and lobe seperation that you want, and a lot of ET is found through the car not just the motor. I know that most heads aren't "stock" but still they obviously don't have great flow numbers. I know no one is going to give away all their secrets and i wouldn't expect you to but hoping you could give me some general answers. looking for some answers about cam selection. I run a 393 a 351W based stroker with a set of Edelbrock RPM heads which only flow about @250 at .600 I knew the heads were small when i put the motor together but money was tight and i got them for a good price. I was told buy several people since the heads were small and i was feeding 393CI to keep my cam selection fairly mild. Was told as bracket racers with low horsepower motors we should try to make up as much ET as we could in the first 330 ft and you do that by making as much torque as possible, and that a "big" cam would hurt me. I have talked to several Stock racers they told me basically they try to make their cars run as quick as they can the first 330ft and that the cars are basically done @1000ft. But from what i gather the run fairly big duration cams.I basically see my car is a stock eliminator i am head restricted and trying to run as fast as i can, same principle as stock So here is where i am confused if we both are basically trying to do the same thing and people told me to run small duration cams and Stock racers are running large duration cams. How are we doing the same thing, who is right, which approach is better. Is it because stock is limited on the lift that the have to run a bunch of duration to make up for it, and since i can go up on lift that i can get away with less duration. I'm wondering if my car would run faster with more duration or would i slow down I hope this all makes since, and some one can clear up the confusion for me.

11-07-2008, 10:39 AM	#2
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,367 Likes: 6 Liked 57 Times in 27 Posts	Re: Couple of questions about Stock what camshaft is in your car now? What RPM do you run? __________________ Chris Bowman The Mountain State Mustang 1984 Mustang GT350

11-07-2008, 01:02 PM	#3
68Mustang Junior Member Join Date: May 2005 Location: Virginia Posts: 47 Likes: 0 Liked 2 Times in 2 Posts	Re: Couple of questions about Stock Right now I have a hydraulic flat tappet 239/247@50 541/565 106lsa. I have the shift light set at 5900. The motor is 10.6:1 1 5/8 headers 3200w/driver 8" ATI flash @5000 4.56 28x10.5 bias slick Went a 1.468 6.931 98.4 MPH the other week.

11-08-2008, 10:10 AM	#4
Greg Hill VIP Member Join Date: May 2006 Location: Louisville , KY Posts: 1,994 Likes: 63 Liked 270 Times in 68 Posts	Re: Couple of questions about Stock Bigger cam, bigger headers, more gear, higher stall, higher rpm. greg

11-10-2008, 08:47 PM	#6
Greg Marshall Junior Member Join Date: Nov 2008 Location: White Rock,bc canada Posts: 61 Likes: 42 Liked 8 Times in 5 Posts	Re: Couple of questions about Stock I run a 418 cubic inch windsor stroker 10.5 compression motor with World products heads which flow 265 at 600 intake and 210 exhaust . With this combination and a 691/668 272/280 at 50 Lunati roller cam in a 2880 lb car with 430 gears i had a 1.35 60' and the car went 10.03 1'4 mile at 133 with a small amount of moroso mechnical throttle stop (4 turns) shut off . I believe the 1/8 mile speed was 107 this was behind a C4 automatic

11-11-2008, 09:36 AM	#7
68Mustang Junior Member Join Date: May 2005 Location: Virginia Posts: 47 Likes: 0 Liked 2 Times in 2 Posts	Re: Couple of questions about Stock Hey Superstreet what are you shifting at and how much converter do you run.

11-11-2008, 04:04 PM	#8
Greg Marshall Junior Member Join Date: Nov 2008 Location: White Rock,bc canada Posts: 61 Likes: 42 Liked 8 Times in 5 Posts	Re: Couple of questions about Stock i shift at 6100 rpm which is where max hp is made. Converter stalls at 4500 rpm (8 inch TCS model) max torque is 540 lbs at 4300 At this point the car still has too much converter slippage and would have more mile per hour.