350 bored .03 over
all. 64 cc heads.
1.6 rockers
duration is 235 and 240 with a lift of .500 and .510 cam
1 5/8 headers
true 2 1/2 dual exhuast dumped with 40's
373 gears with posi
t5
rpm air gap intake
msd ignition

is the 750 to big? i cant get it to run a 100 percent. bogs for a second at wot in 4 gear
what can i try?
also what kinda of power numbers do you guys think i might have at the wheels our track times?
i plan on tacking it to union grove in wi soon

 

It should be okay. The bog is most likely a lean spot. I will say this: if you really want to test your carb tuning skills, do it in a stick shift car with too big of a cam on a wide LSA in a full weight car. Definitely a challenging situatioin.

 

ya it the t5 stick, first and second gear scream but it seams like im loosing some in third and fourth, i think im going to invest in a wide band sensor our just take it to a dyno and have it done this carb is kicking my a$$

 

It could be losing fuel pressure, going rich or lean upstairs hard to tell.
Get the wideband and hit the dyno for some tuning.
750 is plenty for that

 

Timing curve probabily needs work.
Carb accelerator pump system parobabily needs work.
Jetting probabily needs work.
With that cam if you try to run it @WOT at too low an rpm it will
bog or have sluggish acceleration untill the motor get up on the cam.
on the power curve. "Lugging the motor"
The longer the cam duration the higher the engines natural usable power curve
rpm range. Big cammed motors like to rev and will be sluggish at very low rpm.
Dialing in the above helps a ton.
I suggest that his motor "will come up on the cam" about 3000 rpm.

If you really want the motor to pull strong from a lower 2000+/- minimum rpm then change the cam for a cam with shorter duration and overlap.

What rpm are you experiencing this lack of throttle response?

 

I have gotten It to run much Better i ended up finding out that the Ac. Pumps Were shot. Also ive been playing with the jets. Only hesitates in fourth gear at wot for a second at around 3 k. Im still gona have It tuned just to make sure Im getting everything out of It. Just curious what kind of power do you guys think its making? Around 350 at the crank? 1/4 times with m/ t radails and 373 gears?

 

Should be well over 350 HP at the crank.

ET will probably be in the 13's at first, then it'll be whatever the vehicle the track uses can tow you across the finish line.

 

How far Over 350 HP? I dont see It stepping lnto the low 400. If My first couple of passes are in the low 13's il be happy. I just put some m/ t tires on and i feel like something is going to break at the track being that i still have the stock drive shaft and trans

 

Be careful with that T5... This is why I upgraded to a T56. Just a little peice of mind.

 

i know my t5 is already acting up and i have been debating if i should upgrade to a t56 our rebuild my t5??? also im sure this is in other threads but will a t56 bolt right up to a 71 sbc??? and is the vss the same???

 

I would say to check out the accelerator pump system and your float levels.

 

Apparently my tongue-in-cheek first response didn't get through.

Forget the T5. It isn't up to the task.

An LT1 T56 will work with a '71 SBC, but the LT1 flywheel won't. Should be available, but will be a bit more than you'd normally pay.

 

if i end up going with the t56 i hope the new flywheel i have will work. the flywheel that was on the 305 didnt bolt up the id for the crank was to small and i ended up buying a new one for like 300