I have 69 327 built in 66 chevelle malibu coupe
30. over hyper coated flat tops
202 valve, high compression heads
480 lift, hydro
team-g high rise single plane
after market fuel pump
duel 2 1/4 pipes
roller rockers
double roller t,c
accell dist
3.08 gear
350 tran
10 inch 3000 stall

top end seems to run great and low end and normal driving, but when I put her to the floor it wants to studer and then go, I almost have to let off and then refloor and it take off, it donsnt back fire or nothing. Using a 600 edelbrock and don't no what the problem is when I floor it, is that to big or to small, or not the problem? last question how much hp do you think this engine has. I was thinking about around 300 maybe more maybe less?

Im guessing 350hp at the flywheel. Sounds like a carb. or timing issue...what kinda carburetor, and what is yur timing curve like? Sounds like you have a Holley and blew out the power valve. I would be surprised if it hesitates that bad with an Edelbrock/Carter, they usually have a little hesitation but you would have to seriously change something to have it be real bad.

Assuming the ignition timing is properly adjusted,the carb is most probably the culprit.

The single plane intake needs a bigger pump shot compared to a dual plane these carbs are calibrated for. Try to increase the size of the squirter from the stock 28 to a size 35 and make sure the pump linkage is in the top hole on the arm.

Also, the secondaries open too soon on some applications and cause a bog when the throttle is mashed at low engine speeds. Unlike the Quadrajet or the Holley, the counter weighted secondaries on Edelbrock/Carter carbs cant be adjusted easily (without adding or removing weight from the air valve).

3.08 gears and a high rise single plane dont mix very well. If possible, swap the intake for a high rise dual plane like the Performer RPM. The bottom and midrange will improve too.

Size-wise 600cfm is fine for your 327.

Good Luck!

Originally posted by novaman:


3.08 gears and a high rise single plane dont mix very well. If possible, swap the intake for a high rise dual plane like the Performer RPM. The bottom and midrange will improve too.

Size-wise 600cfm is fine for your 327.

Good Luck! I second that> Some deeper gears like 3.73 will help too.

While its been kicked around here 100's of times, it seems no one pays attention, those hi rises single planes may look cool, its a high rpm intake and with your 3.08's your just making it worse...Edelbrock RPM air gap is what I'd use.

Take the engine displacement x the maximum rpm your going to spin it up to, and then divide it by 3456 to calculate the carb size..

ex: 327 x 6200rpm = 2,027,400/3456= 587 cfm

The carb should be right, like everyone else is saying, the intake is wrong and the rear end gearing is not helping either.You can probably get the carb tuned better with jetting and secondary opening adjustments but that single plane intake in robbing you of some power...

I have learned alot from you all THANKS
I am going to change the intake before summer I hope the timing is correct I have looked at it hundred of times to make sure its not off, I even put light wieghts and heavier springs in the distributer not noing much of what I was doing. I am not a perfect engine builder just learning all I can. If it starts good and shuts off good I think its ok but I maybe wrong.