please help any one please please please

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Oct 21, 2002 | 09:49 PM

wirebrain_8

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Joined: Oct 2002

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From: lexington us

please help any one please please please

could the holley 750cfm carb be the problem with my truck poping and pinging and backfireing when the motor is at high rpm's and if it is should i rejet it and is this hard to do for a holly carb the truck is a 1972 ford f100 with fresh rebilt motor just finished it 3 days ago the motor is a 360 FE

Oct 21, 2002 | 10:23 PM

jds1971

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From: Watauga TEXAS

please help any one please please please

[updated:LAST EDITED ON 21-Oct-02 AT 11:25 PM (EST)]The first thing I would advise is to find a 600 CFM for your engine. A 750 is way too big for a 360.

Next, get rid of your points and go to electronic ignition. My guess is that the points are either a little off or they are bouncing around at high RPM. If it is a used distributor, a worn shaft could cause this problem also. In my opinion, points will never supply the amount of spark needed to efficiently burn the fuel that a 750 throws down the intake.

The first thing people suspect when something is wrong is the carb when it should be the last, provided you have the right sized carb to begin with. You have to make sure that you have a sufficient amount of spark to burn the fuel before you try to adjust the metering of the fuel.

Good Luck-

Joe

Oct 21, 2002 | 10:42 PM

gtex

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Joined: Apr 2001

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From: Texas

please help any one please please please

Pinging at high RPM is usually an indication of too much timing advance, make sure you are around 34 BTDC at 2500+RPM. You might just back off the initial timing and see how it runs.

A 750 CFM Carb. is probably too much for a 360.

Oct 22, 2002 | 12:46 PM

wirebrain_8

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From: lexington us

please help any one please please please

well thanks for all your help guys i have found the prob its the peace of ##### holley laser shot coil i was useing i un did the holley laser shot and put the stock coil back on fired it up and it ran very nice no poping no pinging and no burning up the points

Oct 22, 2002 | 09:30 PM

Brad Deicke

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please help any one please please please

Yeah a 750cfm is way too much my 400 only uses a 600cfm Edelbrock and it runs great.

-Brad

1970 F-250 2wd 4sp. 360FE
1979 F-250 4x4 4sp. 400M

Oct 23, 2002 | 11:53 AM

buzzard

Logistics Pro

Joined: Oct 2000

Posts: 3,960

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From: All over Texas

please help any one please please please

Why does everybody think a 750 is too much carb for a 360? I've run larger on smaller engines with tremendous success. While I elected to go with a 600 CFM on my 390, I guarantee it could easily handle a 750.

Oct 23, 2002 | 12:04 PM

Triple Threat

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From: Anderson, CA

please help any one please please please

As long as everything flows well through the engine there should be no problem. I've seen 850's run on 351's if they are built to turn serious RPM's and their volumetric efficiency is in the mid 90's.

A well built 360 that runs a max of 5500 RPM can run between a 650 and 750 no problem.