LB0442
Well-Known Member
I bought 2 of the poly 4bbl intakes from a member here. Just installed one on the 1965 D100 shop truck. Originally it had a stromberg 2bbl with an oil bath air cleaner. Cleaned out the carb and it ran pretty good. I put a 727 in it so I had to use a BBD off a parts car as I needed the hookup for kick down linkage.
Sand blasted them both to clean them up.
Neither one had heat shields on them so just added a flat piece of steel, locktited studs and nuts on.
One big problem was the temp sender, it is 1/8 pipe thread. 1 of the intakes had already been tapped out to 3/8 pipe but when you put the sender in a bushing it really shrouds the sender. So I used a solid 3/8 plug, drilled a pilot hole, plenty of pipe dope and installed it in the intake, pretty snug. Then cut it off just above the manifold, ground it down flush and drilled and tapped it for 1/8 pipe. That gave it about a 3/8 thick chunk of metal for it to thread into and it is flush on top with plenty of room for the sender to go down below the threads. I figured if it did leak a good ez out would take it out and try again.
I spray bombed it with some Pontiac blue.
I used a 9636 AFB that I have had in the parts bin for probably 20 years. It cleaned up pretty good. I had to go pretty rich to get it to run right, more than the LA318's seem to take. Ended up with .104 primary and .098 secondary jets, .068x.0555 rods, and drilled out the accelerator pump nozzles to .032. Even at that it is very slightly lean so I was going to put the wide band O2 on it, welded in the bung and it has a bad O2 sensor, again.
Just running it on the primaries it is 1000% better than the 2bbl. Kick in the secondaries and the trans kicks down it just really really nice. Plus there is that cool 4bbl sound.
Sand blasted them both to clean them up.
Neither one had heat shields on them so just added a flat piece of steel, locktited studs and nuts on.
One big problem was the temp sender, it is 1/8 pipe thread. 1 of the intakes had already been tapped out to 3/8 pipe but when you put the sender in a bushing it really shrouds the sender. So I used a solid 3/8 plug, drilled a pilot hole, plenty of pipe dope and installed it in the intake, pretty snug. Then cut it off just above the manifold, ground it down flush and drilled and tapped it for 1/8 pipe. That gave it about a 3/8 thick chunk of metal for it to thread into and it is flush on top with plenty of room for the sender to go down below the threads. I figured if it did leak a good ez out would take it out and try again.
I spray bombed it with some Pontiac blue.
I used a 9636 AFB that I have had in the parts bin for probably 20 years. It cleaned up pretty good. I had to go pretty rich to get it to run right, more than the LA318's seem to take. Ended up with .104 primary and .098 secondary jets, .068x.0555 rods, and drilled out the accelerator pump nozzles to .032. Even at that it is very slightly lean so I was going to put the wide band O2 on it, welded in the bung and it has a bad O2 sensor, again.
Just running it on the primaries it is 1000% better than the 2bbl. Kick in the secondaries and the trans kicks down it just really really nice. Plus there is that cool 4bbl sound.
