i have a 358 with a 268xe cam, dart pro1s[200cc],rpm intake ,650dp, 3.42 gears, th350 tci 3000 stall, 2055 headers and a dnyo max 2.5 catback. my runs about 82mphs in the 1/8. it seems like it it sound have a little better mph . right? i know that the 2.5 exaust is is hurting it.

 

We have run a best of 8.11 @ 85+ in 1/8 mile. Are you spinning tires a lot? What is your 60' times?

You should see more MPH IMO unless you are spinning way too much. You have enough cubic inches to build speed. We are only running a 305, granted with slicks and 4.10 posi. Our 60' is at 1.85. We are in process of changing cam and manifold to drop 60' further. We have no traction issue, just not enough torque.

 

That trap should put you around 102-104 in the 1/4!

 

it pulls about 2.10 60ft on street tires. i ran it once in the 1/4 it ran a 13.87 @101 also on street tires

 

you think the 2 1/2 catback could cause a 3-4 mph lost?

 

I think that you would unleash many ponies if you did a cam swap. Your current cam is a little on the small side, considering the large intake runner size of the heads you have. I would suggest something with a duration of at least 230 @ .050" and close to .500 lift. You might consider stepping up to a 750cfm carb also. And yes, that 2 1/2" exhaust is most likely hurting performance. 3" would be much better.

 

Also carb is too small, 750 or an 800 would be much better. I'm running 86/ 87 mph with the GTA in sig. But the car is slow, 8.80s to 8.90s. I don't think much of the xe268 for a race cam. I'm going to try a 305h next spring, but I don't intend on driving it every day like I did.

 

keep the carb i run dart iron egale heads with 215 cc intake runners and rpm intake comp cam extreme 274 230 236 @.50 488 lift 490 im going to try the 294 comp and victor jr intake, with that set up i run 8.2 at 90 in the 1/8,if your not turning 6500+the 650 is fine

 

try jetting the carb to 69 82 that should help,i got 71 84's in mine

 

right now i have 69 76 jets i have'nt played with the jetting much i'll try that. thanks

 

jeting can make a big diffance i nocked off a full sec of my ets,from when the jets that where in it i think they where 67 74

 

i just puts some 80s in, man it feels alot better. i thougth i had 76 in the back but they were 75. i might try some 82s like you said.

 

well the setup you got is a good one,you might even try 71 84,or just keep playing with it till its right,those dart pro1s are bad *** heads, with good flow,i would bump up to a victor jr and 284 or 294 extrem comp cam,i just put the victor jr on and the 294 cam it and whent to the track and my best et was 7.6 at 96 with 1.90 60 ft time on street tires,with the heads you got and the 294 cam you should trap at least 96 mph,but you already have a good runner,just tune it in