Gutless and w/ a flat spot.

[minimandan1]

Ok so I have got my 5.0 HO in the car and running but I have got an unexpected dilemna. Here is whats in it.

-stock rods and pistons
-fully ported E7 heads (exhaust, intake and combustions chambers); with oversized intake and exhaust valves
-fully ported rpm airgap intake manifolod.
-Ford Racing B303 cam with 1.7 full roller rockers giving .510 lift on exhaust and intake with about 285 duration on both sides and i think a 112 overlap.
- I used the duraspark II ignition
-Hooker Super Comps
-The carb i used was taken of my fairly stock 289 it is an edelbrock 1405 about 600 cfm. it was not modified.


I am expiriencing very low power for what I expected out of this setup and also whenever i accelerate fast I hit a flat spot. Sometimes when I try to gun it it seems like the motor dies and then takes a second or two to start accelerating. This motor feels like it has little more power than my stock 289......can someonw help me with what I think is merely a tuning issue. This setup should be able to spin the tires I would think.

-Thanks,
Dan

[ca]

maybe rebuild the carb? the hesitation is usually caused by the accelerator pump bein screwed up someway(maybe just a cracked diaphragm) ooor could be ign. timing= fix one then the other. you degreed the cam right? could be power lost in there.

lotsa maybe's but the first 2 are most likely.

may hafta supply a lil more fuel through that carb so you need to read up on it- like jetting/metering rods etc.

boltin parts together is the fun part now you git to make it run right ;D

[ca]

oh yeah, what do the plugs look like?

[minimandan1]

i havent taken the plugs out because those hookers make it a bit hard. What do you mean degreed the cam?? We installed the cam at 0 degrees. I have a huge gut that the motor is not getting enough fuel. and when I punch it and the secondaries open up, the motor gets a ruch of air but not much fuel leaning it out causing the flat spot. I have a guy who will tune it on an infared dyno for 150, or I can get the metering rod kits for 55 bucks and f**k with it myself what do you think?

[STU]

Toss the edelbrock POS in the trash and buy a brand new box stock 600 Holley...Set the float levels, idle speed and go....I had almost the same combo in my car and the Holley was a dead nuts fit right out of the box, the jetting was almost perfect. My timing is set at 12*BTDC. I had my car on the dyno and the A/F was very good....No flat spots, just ass hauled....LOL

[arie]

The edelbrock 1405 should be more than enough carb for that engine. (I used a 1405 on mine and had to go back to a 1404).Check vacuum going to the distributor from the carb one outlet is a metered vacuum and one is a constant vacuum. If you step on it and the distributor does not advance, the engine wll just die till the mechanical advance takes over. It appears you are using a stock distributor from the 80 s. If so check the vacuum advance. Set the timing at 12 as Stu runs.

[ca]

arie is right. a lot of peeps screw up the vacuum connection at the carb to dist and take off the wrong side. and make sure you set the timing. with the choke open make sure you are pumpin gas when you depress the accelerator pump= shouldn't be a trickle, should be a good healthy squirt.

you may hafta jet up a couple numbers so that kit wouldn't be money wasted. take it with you to the dyno run.

i think your prob is just little things and you probly wouldn't be able to tell if you needed jets till you get sorted a lil bit.

good fresh gas in that car,right?

[ca]

oh yeah, set the timing with the hose disconnected and plugged that goes to the dist.

[w2zero]

That carb should be perfect for your combination. Your combo is highly similar to mine except for the distributor and headers. Pull the vac and plug it then set the timing like Stu said. Plug the vac back in (correct port) and try again. That pump squirt has to be healthy to make up for the excess of air when you open it up and lean it out so play with the other two positions on the squirt linkage. Pull the metering rods and stretch the springs slightly too.

[Meteorgirl]

Pistons, ported heads, large valves, 1.7 rockers, headers all very similar to mine. Differences are I run an MSD distributor at 18 degrees timing and the Performer intake. An RPM AIR GAP is not a low end manifold, it makes power after 2000 or 2500. Last diff is the carb. I used to run a stock Holley 600 CFM off an early 70's Ford, switched to a Holley Avenger 80570 570 CFM and it was like bolting on another 30 HP. Oh yeah, it gets better mileage too.

I agree with the concensus that it's probably lots of little things. Oh yeah, those 1.7's cost you a little low end also.

[ca]

how you doin here Dan?