what would be the best lda for my indy headed 408 street/strip barracuda? 67 cuda weights 3300# with me in it. the heads are 360-1 and flow 312@.600, compression 12.5, indy intake/1000hp prosystems, 1 7/8 tti, 727/4500 stall, 4.10gear/ 28"tire. current cam is 258/264@50-.650/.650 lift@the valve 108lda. i'm thinking about getting a larger scott brown cam, but he likes a 112*lda and i'm wondering if that would kill the short times. best 60' is 1.57 footbraking.

i was going to say 108lsa or 110lsa, but Scott knows his stuff and i think with the prosystem the 112 works better, i put a mild vodoo cam in my 383 with 112lsa so the idle would be better, longer torque curve, more vacuum for brakes

yeah, scott does know his stuff. there's been some controversy about straight vs split pattern cams. i read a post on here about straight pattern cams always making more torque. thats just the opposite of what i'v heard up to this point. anyone have knowledge on this as being true? i had a 340 with a straight pattern cam and ground on a 107 and it makes great torque.

LDA by itself is close to meaningless. The idea is to get the intake and exhaust opening and closing points where you feel they should be. Your 60 ft is pretty weak for your combo and my best guess is you need more converter and 4.30 gears to pick it up. Can you post an ET slip as this will help get a better picture of things. Generally you want your converter stall to shift point difference of 1200-1500 rpm and with what you've got I'd think you'd be making nice power above 6000 rpm. You cam looks pretty close for a strong street/strip carIMO.

two slips, one with best 60' with a 1/8 mile run and best quarter mile run with a terrible 60'.

1/8 mile run

Wow that slip isn't very pretty is it? There are several things to check,but IMO changing the cam wouldn't be the first choice although I'd go larger and keep the 108lsa. Something in the tune would be the first place to dig. Have you a wide band o2 to monitor your fuel curve? Timing is also worth looking at,are you running a locked out dist? The converter also has me curious? 8"? was it tailored for this combo? I wonder why it's not picking up more MPH from the 1/8 to 1/4. 25 or so would be more normal,IMO. What are the details on your fuel system? Are your valvesprings the correct piece and setup correctly? I had a friend the was having similar problems,we found a front brake line had collapsed internally causing one brake to drag and scub a few tenths.

ok, i'll keep the 108. the dist. is locked and the fuel curve is real straight at 13:1. i think the convertor also could be holding me back. its a PTC tight 9.5 with 4500 stall set up for street use. i go thru at 6000rpm, so a 4.30 gear may help also. thanks for the input.

All combos want what they want to run well,so changing jetting and trying different timing would be a start. We run a 408 in a duster and have found a good 8" converter(5300) the best choice for us. Best 60ft's have been 1.38 with factory heads and a roller cam 264/272@.050 .640 108lsa in at 103. Your compression could tolerate more duration,but more converter would be needed to match and more gear as well. I really like your car and your combo should fly.Good luck

i was looking at a crane cam simular to yours. what are the opening and closing points of yours? my timing is currently at 32*. it liked this best on the dyno.

Timing and fuel curve on the dyno don't often work at the track.Don't be afraid to make changes. I'd start with the carb since 32 degrees is fairly close. The cam is a Lunati grind(nothing special) which the cam card has long since vanished. I do know it's an old RA1? series lobe 297/262 306/272 around .615 to .620 with 1.5 rockers we run 1.6 rockers. I assume this is a street/strip car? You don't want a killer cam lobe that will require lot's of upkeep. Your current cam while not ideal,isn't killing your combo,theres alot hiding in what you have IMO.

There is a guy running NMCA nostalga muscle car class,it's a yellow duster from Kentucky. Nicks combo is very similar to yours but he runs a solid flat tappet crane cam. I don't recall the details but it's close to your numbers at .050 and around .580-.600 lift 108lsa? He's run 10.40's and maybe better by this time.

sounds like i need to get more time at the track and tune the heck out of it.

I think I would before changing anything internal.