[scott70]

Currently using dougs 1 7/8" pri.,3.5" collecter.Heads are 324 cfm at .700 lift e heads,UD solid roller with 263/268 @ .050 with .688 lift figuring in the 1.65 rockers.(108 LS,102 ICL)Victor with a 1050 dom. 4800 converter with 3.73 gears and 28" tall slicks.Best ets are shifting at 6300-6400.

Was wondering if the 1 7/8 dougs are hurting the hp output at all.Best so far this year was 6.59 at 104 with 1.46 60 ft.Currently in this summer weather its averaging 6.64-6.67 at 103's. with 60's at 1.48.I'm sure it will run better than 6.59 this fall.

One thing i can say about the dougs are they fit real nice and are tucked in good.Was thinking about trying a set of used hooker 2" if i can find a used set that are decent.Would like to try some 2 1/8th but i dought used ones for a A- body come around too often.

If i can shave some et by switching headers,that would be nice.IMO,this car should be running quicker than it is.

[Ron H]

Do you hook really well with your current set up? If so, try more gear. Bigger headers should show an improvement as well. Do you run a spacer with the victor? Are you open headers or through exhaust?

[440GP69]

i have heard from a couple others that right around 700 HP is where a switch to larger than 1-7/8 will make a big gain as well as smooth out the fuel curve FWIW

[scott70]

Originally Posted by Ron H

Do you hook really well with your current set up? If so, try more gear. Bigger headers should show an improvement as well. Do you run a spacer with the victor? Are you open headers or through exhaust?

Yep,it hooks well even though my 60 ft.s arent that great.Even had a 5200 rpm flash converter in it for a while and it did the same 60 ft as the 4400 converter.Anyway,i run a 1" open spacer,open headers with 14" extensions.Strictly race car.Before the cam swap,It dynoed at 610 hp so i would say its got to be around 630-640 now.

[Bnick166]

I've heard of 2" primaries going low 8's @ 160+.....

[scott70]

Well,i dont know what else to do to this combo for tuning out some more ET.Theres cars here going faster with less cam,less heads,carb,same gears,same weight,ect.I guess its not all working together perfectly,,,,.If i find a decent priced set of hooker 2" some time,i will try them out.

[Jeff Kinsler]

I dont think the headers are slowing it down at all. i ran 1 7/8 dougs with my wideport eheads and i dont think 2" would have helped that combo. I do have 2" now but the motor is a 499 high compression motor.
i do agree the car should be faster. how much does the car weigh?

[scott70]

about 3200 race weight.The windows still roll up and down and has the stock dash board but anything that could be taken off has been.Never officially weighed it.

[Ron H]

I picked up with a switch to Flowmaster 4-2-1 scavenger collectors over the Hedman slip on collectors with 2" headers. Mostly in 60'.
Measuring from the middle of the collector, how much pipe is there? 18" should be about optimum for your combo.
Have you tried shifting earlier, 6100, with your combo?

[BruceWilkie]

see post 11 http://forums.maxperformanceinc.com/...d.php?t=553324

[BruceWilkie]

About 20 years ago with a 440 combo in a 3900 lb car went from 12.62 best to 12.30's going from 1.875-2.0" headers. (once collector length and jetting were optimized) my collector was 16"x3.5" from end of primary to end of collector IIRC. Cam gearing and convertor changes got it into the 11.70's. May have found more had I retuned the collector length I'll never know.

[scott70]

Originally Posted by Ron H

I picked up with a switch to Flowmaster 4-2-1 scavenger collectors over the Hedman slip on collectors with 2" headers. Mostly in 60'.
Measuring from the middle of the collector, how much pipe is there? 18" should be about optimum for your combo.
Have you tried shifting earlier, 6100, with your combo?

The collector ext. pipe used to be 18".I put some paint on it and about a good 6" of the end kept the paint on.So i cut off 4.5" and that was 3 weeks ago and havent been to the track since because of RAIN.We have enough rain in the last month that should be for 6 months.So ive got about 14" of collector extension and the collector on the header must be 8" so that would put me around that 18" off center.
Ive tried jetting from 94 to 99's,timing from 32 to 38 total with total coming in early and later.3 different converters this year.I tried last time at the track shifting at 6100 on the 1-2 shift and it fell off .03 and .2 mph.It likes at least 6300.Going through the 1/8th traps at 5700.

[Ron H]

Hopefully the shorter pipe helps a little.
With everything you've done. Gear seems to be the biggest kicker to help with 1/8th mile track.
Otherwise, trying a bigger cam or porting the heads more?

[scott70]

The cam i used before this was a UD flat solid with 108LS,102 ICL.I tried it straight up and also on the retard position on the timing chain/gears.That setup ran a little better in the retard position.The new solid roller has the same LS and ICL.It degreed in at 101 3/4 ICL in the straight up position.I wonder how it would respond to retarding the cam??

[Ron H]

May help a little.
I am running 279/283@ .050 108 LSA in at 104* LSA. .4267 lobe with 1.65 HS rockers.
You may want to go to a cam in the mid/upper 270's @ .050 as well.