[Cliff R]

Tks for the kind words.

As far as cfm ratings I'll add this. Edelbrock made their 1904, 1905 and 1906 from the late model castings with the large primary bores. They rated them at "795" cfm. Interesting that the secondary air flaps open EXACTLY to 90 degrees same as the testing done in 1973.

The Edelbrock 1910 uses the same castings, but has the airdoors open considerably past 90 degrees with a much shorter stop. Their is a good pic of it in my book in the chapter on Edelbrock Q-jets. Assuming Edelbrock tested their Q-jets prior to selling them their information is exactly what we found here flow testing the same units.

Also +2, 3, 4, 5 and 6 about the amount of BS out there plus outdated and inaccurate information, especially on the Quadrajet carburetor. There isn't a single day goes by here I don't get a call from someone wanting a "bottom plug kit" because their engine fails to start after the car has set for a week or so. They went on the Internet and every poorly informed soul regurgitating old/outdated/inaccurate information responds to their complaint telling them to glue up the bottom plugs with some useless epoxy that doesn't hold back fuel in the first place. The real problem is either a swollen or failed accl pump cup either not putting fuel into the engine when fuel returns to the carb or it so tight in the bore it woln't let fuel past it to fill the accl pump well or some sort of fuel delivery back to the carb issue. Either way you get a no-start scenario and have to dump some fuel into the engine to get it to fire.

Here are the facts. Rochester fixed the leaking bottom plug issue clear back in 1969 when they made the castings thicker at the plugs and pressed in solid aluminum plugs and swaged over them. From 1965-68 ALL of them will be leaking because they used small brass cup plugs driven and staked in place. Lead was common for the front plugs and we often see those leaking as well.

It's pretty rare to see a later model carb leaking compared to every single early one, but in any and all cases leaking bottom plugs will NOT keep your engine from starting after a long period of not using the vehicle. In most cases they actually cause hot restart problems after 15-30 minutes of sitting after a hot shut-down as they leak fuel into the intake flooding the engine............

[Ram Air IV Jack]

Originally Posted by Cliff R

Tks for the kind words.

As far as cfm ratings I'll add this. Edelbrock made their 1904, 1905 and 1906 from the late model castings with the large primary bores. They rated them at "795" cfm. Interesting that the secondary air flaps open EXACTLY to 90 degrees same as the testing done in 1973.

The Edelbrock 1910 uses the same castings, but has the airdoors open considerably past 90 degrees with a much shorter stop. Their is a good pic of it in my book in the chapter on Edelbrock Q-jets. Assuming Edelbrock tested their Q-jets prior to selling them their information is exactly what we found here flow testing the same units.

Also +2, 3, 4, 5 and 6 about the amount of BS out there plus outdated and inaccurate information, especially on the Quadrajet carburetor. There isn't a single day goes by here I don't get a call from someone wanting a "bottom plug kit" because their engine fails to start after the car has set for a week or so. They went on the Internet and every poorly informed soul regurgitating old/outdated/inaccurate information responds to their complaint telling them to glue up the bottom plugs with some useless epoxy that doesn't hold back fuel in the first place. The real problem is either a swollen or failed accl pump cup either not putting fuel into the engine when fuel returns to the carb or it so tight in the bore it woln't let fuel past it to fill the accl pump well or some sort of fuel delivery back to the carb issue. Either way you get a no-start scenario and have to dump some fuel into the engine to get it to fire.

Here are the facts. Rochester fixed the leaking bottom plug issue clear back in 1969 when they made the castings thicker at the plugs and pressed in solid aluminum plugs and swaged over them. From 1965-68 ALL of them will be leaking because they used small brass cup plugs driven and staked in place. Lead was common for the front plugs and we often see those leaking as well.

It's pretty rare to see a later model carb leaking compared to every single early one, but in any and all cases leaking bottom plugs will NOT keep your engine from starting after a long period of not using the vehicle. In most cases they actually cause hot restart problems after 15-30 minutes of sitting after a hot shut-down as they leak fuel into the intake flooding the engine............

This is exactly my point. Half backed ignorant suggestions to lost souls that don't know any better. The internet is full of them so beware!!!