Recent content by 500duster

I checked for any type of interference with gasket or linkage and all is good. Held throttle half way open and blew air into passenger side venturi and secondaries open. The 380 horse crate motor does have a lumpy cam but that should not change venturi vacuum. I'm currently baffled. I'm going to...

Thanks. I will check tonight

I will check linkages tonight also. I will try blowing air through right primay venturi with throttle open and see if secondaries open with carb on car. I did this on bench and all was good but did not try with carb installed.

I will check for gasket interference tonight. The 750 vac secondary is what mopar suggests for the crate motor. I had a 750 double pumper on engine last several years but when i tried starting car after winter storage it ran like crap. Took carb apart and fuel bowls and metering block are full...

I have made sure the vacuum passage is clear. I have bench tested the secondaries by blowing air past the vacuum hole on the right primary venturi while holding linkage open and the secondaries open. For some reaon they don't open when the carb is on the engine and in use.

I have a holley 3310 750 on a mopar 380 horse crate motor. The secondaries will not open. I have the quick change spring kit on the carb. I have changed the diaphragm, tried it with and without the check ball, tried all springs in the holley spring assortment. I currently have no check ball in...

Thanks

Looking for a fresh or fairly fresh set of big block heads. I'm putting together a fairly stock 440. Not particular on which castings. Just looking for something ready to bolt on.

PM sent

Finally got some dry weather so I could drive the car and check the secondaries. The secondaries were definitely not opening. I had a new vacuum diaphragm so I installed it with a yellow spring, secondaries still didn't open. I have a 750 double pumper i'm going to throw on tomorrow and take...

this is a good comparison- I'm going to check out the secondaries on my carb to start with.

It is the roller cam version

Is that the dynamic converters by Frank Lupo? if I remember correctly there are 2 different dynamic companies.

I an not sure but have been wondering about that. This engine has less than a thousand miles on it so to be that down on power there has to be something going on. I just put the lightest advance springs in the distributor so I will have 35 degrees total all in by 2000 rpm next thing of concern...

I checked those numbers before I went to the track and was obviously disappointed when I got my 1st time slip. I have heard 3:91 gears work best with the 380 horse crate engines so I wasn't expecting a 12 second pass but thought for sure it would run in the lower 13 range. I'm not sure lower...