Okay I have a couple of questions. First heres my combo:
340 with 4inch stroker crank
10:5 compression
571/571 248/254 hyd roller
Rhs heads 2.02/1.625
air gap intake
pro systems carb 830cfm
904 with a turbo action 10in
410 gears.
okay well i got it to run a 11.60 @ 113. It seems like it is falling on its face after the 1/8 mile.
my 60ft is a 1.56 and my 1/8 is 7.30 at 92. I run a 27 in tall tire. it just seems like I have too much gear, because i shift it at 6500 and go through the traps at 6400, but anything over 6200 it seems to loose power so what gears would you recomend for it? or what else would you change? I am running a mechanical fuel pump a 120 gph carter.I have msd 6al and distrubtor.thanks for looking. just need some ideas

what you got for a fuel system? may be running out of fuel.

next time out try shifting at 5800 , then next pass 6000 . See what it does

what size chip/limiter is in the ignition..

what does the plugs look like..

how much timing...

may also want to switch to a 28" tall tire...

im running 3/8 fuel line with carter mechanical and my chip is a 6800. and my timing is set at 38 total and i have done 36 with no difference. I was thinking 28 in tall tire just have to cut to make room for that size lol.

w/cam you got - motors probably done @5500rpm or less.
w/4" arm need more duration for more rpms.
numbers are about right for your combo.
Taller gears.

Okay thanks. What gears you thinking?

How heavy is your car? I think your gearing is OK, Changing to 3.91 would not make much difference. A 29 tall tire would be your best bet.
What converter stall and how much slip?

My car weighs 3250 w/me. the converter stalls around 3800. And im not sure about my springs I know they are comp behive springs. And might be installed at 1.81? Im at work ill have to look when I get home.

I've heard strokers don't like as much timing as the 340/360. I have mine at 32, I haven't messed with it since I installed the engine, Just working on the rest of the combo.

I would check fuel system and valve springs. My thought is 4.10 gear is not the problem. The 60' is slow and with 3.91s it may get worst. Car should go alot faster.

my 408 likes 32-33 degrees of total timing, I still think you are running out of fuel, a 3/8 line and a carter pump to me isn't suffecient, I know mine likes to eat, I really don't think your gearing is off that far, alot of other factors play into the whole combination, like cam,springs timing, cam centerline, fuel delivery etc.

I dont think its the gear either... as said... check
your fuel supply... also with the timing set it at
the minimum that it doesnt slow down not the max...
what is the cam installed at(did you degree it)

Okay I was thinking of upgrading my fuel system. My cam was installed at 108 or 107 if i remember correctly and it was degreed.

Mount a fuel gauge on the cowl to be sure.

Sheldon

Hello,

Check/upgrade the needle and seat size in the carb too.

Damon

One sure way to check your fuel system s o jet the carb up several jets sizs at the track and see if goes faster or slower on the 1/4 MPH, if it doesn't change you probally have a fuel delivery VOLUME problem One other thing IO would try is to back the timing down to 32 to 33 degrees total(above 4500 RPM )Let us know what you find

Those heads have really efficent combustion chambers and do not need as much timing as old fashioned open chamber SB heads, bump the timing down to 32 or so total.

Also need to upgrade the fuel system