Dart Little M sportsman top end oiling issue SBC

[joespanova]

Carl.........if you look real close at the start of the thread you'll see :
"Dart Little M sportsman top end oiling issue "
The pipe plugs that are required are installed , correctly.
I did NOT check lifter bore clearance . I put my faith in Dart quality.
Blind Faith , call it what you will.........its done. I cannot "un ring the bell".


After trying again today I was able to get oil out of the rockers..............priming , with a faster 110 volt drill.

[carl hinkson]

Originally Posted by joespanova

Carl.........if you look real close at the start of the thread you'll see :
"Dart Little M sportsman top end oiling issue "
The pipe plugs that are required are installed , correctly.
I did NOT check lifter bore clearance . I put my faith in Dart quality.
Blind Faith , call it what you will.........its done. I cannot "un ring the bell".


After trying again today I was able to get oil out of the rockers..............priming , with a faster 110 volt drill.

Sorry I missed that.

Its not Dart you have to really worry about. If Dart did not have the lifters its hard to say what your clearances are as roller lifters are all over the map and really need to be checked for clearance before assembly.

Almost sounds like the clearance is to tight as oiling comes from lifter bore clearance, To tight very little oil to loose to much oil.

What lifters are you using ??

I would never let a block out the door with out checking lifter bore clearance as I get alot of calls about lifter bore issues and clearance issues.

[joespanova]

Originally Posted by carl hinkson

What lifters are you using ??

I would never let a block out the door with out checking lifter bore clearance as I get alot of calls about lifter bore issues and clearance issues.

COMP 871 + .300 because they do the least damage to my wallet and the cup to axle c/l was the same as my std. Comp rollers from my previous Gen 1 block ( think pushrods here ), the Dart block req'd a +.300 lifter since the lifter bores are taller , ( .900 base circle cam).

[carl hinkson]

Originally Posted by joespanova

COMP 871 + .300 because they do the least damage to my wallet and the cup to axle c/l was the same as my std. Comp rollers from my previous Gen 1 block ( think pushrods here ), the Dart block req'd a +.300 lifter since the lifter bores are taller , ( .900 base circle cam).

This is interesting as Comp lifters run small any time I have seen those lifters I have had to bush the lifter bores back.

I have to ask why a .900 B/C cam and what is the build ?

Running reduced base circle cams adds alot of pressure angle which is a killer for lifters.

[joespanova]

Originally Posted by carl hinkson

This is interesting as Comp lifters run small any time I have seen those lifters I have had to bush the lifter bores back.

I have to ask why a .900 B/C cam and what is the build ?

Running reduced base circle cams adds alot of pressure angle which is a killer for lifters.

The car and engine below............why a .900 base circle? IIRC I measured with a caliper and if its not a .900 base its close. You'll have to ask Cam Motion that question.........I had it custom ground and thats what I got. I did say I FINALLY got oil out of the pushrods................I hear what you're saying on the lifter O.D. I think I'm fine .The engine is a 355 23 deg. Brodix head 14:1 .

[carl hinkson]

Originally Posted by joespanova

The car and engine below............why a .900 base circle? IIRC I measured with a caliper and if its not a .900 base its close. You'll have to ask Cam Motion that question.........I had it custom ground and thats what I got. I did say I FINALLY got oil out of the pushrods................I hear what you're saying on the lifter O.D. I think I'm fine .The engine is a 355 23 deg. Brodix head 14:1 .

First of all very nice car you have. If you only have a 3.480 or 3.500 stroke there was no need for a .900 base circle cam, Those small base circle cams some times tend to flex with alot of spring pressure and lifters don't like that and the lifters hanging out of the bottom of the bore which is alot of pressure angle is not a good thing.

I think clearance wise you may have a little to much if anything.

I guess roll the dice those lifters will let you know if they are not happy.

What year are your cars ??

[joespanova]

Originally Posted by carl hinkson

First of all very nice car you have. If you only have a 3.480 or 3.500 stroke there was no need for a .900 base circle cam, Those small base circle cams some times tend to flex with alot of spring pressure and lifters don't like that and the lifters hanging out of the bottom of the bore which is alot of pressure angle is not a good thing.

I think clearance wise you may have a little to much if anything.

I guess roll the dice those lifters will let you know if they are not happy.

What year are your cars ??

The aluminum rods LOVE the small base circle ( clearance ).
71 and 65 and thank you.