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Some manafacturer's show a different hydraulic flat tappet lifter for hemis than wedge and some show the same part #.Some show a different lifter for pre 67 wedge engines and show that as the same lifter for hemis(the pre 67 wedge part #).?

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1967 was a transition year for Mopar motors on lifter pushrod cup sizes, 1966, and probally some early 1967 motors, had 1/4 inch ball cups, 1967 and later switched to 5/16 ball. In 1969 when the 440 6 paks motors came out Mopar had those cams ground on a low taper angle with matching hydraulic lifters,they also had the cams ground on 3 bolt cores and used the street Hemi double roller timing sets In 1970 when Mopar switched the 426 Street Hemis to hydraulic camshafts they evidentily used those lifters in them also IHTHs

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so is there any reason at all you could not use 68 up wedge lifters on a hemi camshaft?

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It depends on if the Hemi cam has low taper lobes or not Go with the cam makers brand of lifters

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Some manafacturer's show a different hydraulic flat tappet lifter for hemis than wedge and some show the same part #.Some show a different lifter for pre 67 wedge engines and show that as the same lifter for hemis(the pre 67 wedge part #).?

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1967 was a transition year for Mopar motors on lifter pushrod cup sizes, 1966, and probally some early 1967 motors, had 1/4 inch ball cups, 1967 and later switched to 5/16 ball. In 1969 when the 440 6 paks motors came out Mopar had those cams ground on a low taper angle with matching hydraulic lifters,they also had the cams ground on 3 bolt cores and used the street Hemi double roller timing sets In 1970 when Mopar switched the 426 Street Hemis to hydraulic camshafts they evidentily used those lifters in them also IHTHs

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Some manafacturer's show a different hydraulic flat tappet lifter for hemis than wedge and some show the same part #.Some show a different lifter for pre 67 wedge engines and show that as the same lifter for hemis(the pre 67 wedge part #).?

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1967 was a transition year for Mopar motors on lifter pushrod cup sizes, 1966, and probally some early 1967 motors, had 1/4 inch ball cups, 1967 and later switched to 5/16 ball. In 1969 when the 440 6 paks motors came out Mopar had those cams ground on a low taper angle with matching hydraulic lifters,they also had the cams ground on 3 bolt cores and used the street Hemi double roller timing sets In 1970 when Mopar switched the 426 Street Hemis to hydraulic camshafts they evidentily used those lifters in them also IHTHs

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It doesn't make any difference but for the record there were no 3 bolt cams or double roller timing chains in the 69 A12 440-6 cars. The 6 Pak's came with the same nylon timing gear as all other 440's.

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I would bet money that they did come with the three bolt cam cores and the low taper lifters, I know one or two,(I didn't see in the other guys motor when he change his cam to a blueprinted cheater cam, but the new one was a three bolt and he said he reused the stock timing set and chain do to its low use when he started racing it ) SO CA racer that bought thier cars new and they came with the three bolt cam and timing set from Ma Mopar. Hotrod or Car Craft did a feature on the six pak cars in mid to late 1969 and they quoted the same details on the motors then I bought a 1970 V code Charger used, it had a warrenty block in it with a single bolt cam and timing set with the big rods and external balancer, the dealer reused the same clutch and flywheel that came in the car when replacing the motor. Lots of things occurred in production that shouldn't have or wasn't documented at that time until later, many mistakes(like a 350 HP motor being installed in a R/T or Magnum HP car )in cars went out the door undetected

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But the '70 440-6 engines came with the double roller chain and gears, didn't they. I am sure I was the first one inside my old Cuda's engine and it had them.

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Can anyone tell me how I can id whether or not my comp 278 has the low taper lobes or not?

How can you tell if lifters are low taper or not?

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I tried to respond to your PM this morning but it says you've exceeded your PM limits, clean out your in box Try calling Comp on Monday and ask them if there lobes are standard taper or low taper and then ask them about the two different part # on those two lifters to see if you can use them with your pushrods or not. Remember the pushrod ball sizes needs to match the lifter cup sizes also, 1/4 inch ball in a 1/4 lifter cup, 5/16 and 5/16 together

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The lifter "body height" is 1.832".

I can't find a 3/8" ball around here. I'll have to get one and then measure it.

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The lifter "body height" is 1.832".

I can't find a 3/8" ball around here. I'll have to get one and then measure it.

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So I picked up a 3/8" steel ball at the hardware store.

The steel ball measures .375".

With the steel ball in the lifter, they together measure 1.922"

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That measurement tells me that the effective length (bottom of the lifter to the bottom of the pushrod cup) of that lifter is 1.547 using the 3/8 ball bearing instead of a 5/16 diameter bearing Do you know if that is a later, 1967 and later, 5/16 lifter cup or is it one of the 1966 and earlier lifters with the 1/4 inch lifter cup seats in them

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The lifter "body height" is 1.832".

I can't find a 3/8" ball around here. I'll have to get one and then measure it.

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So I picked up a 3/8" steel ball at the hardware store.

The steel ball measures .375".

With the steel ball in the lifter, they together measure 1.922"

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That measurement tells me that the effective length (bottom of the lifter to the bottom of the pushrod cup) of that lifter is 1.547 using the 3/8 ball bearing instead of a 5/16 diameter bearing Do you know if that is a later, 1967 and later, 5/16 lifter cup or is it one of the 1966 and earlier lifters with the 1/4 inch lifter cup seats in them

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Cab, are you taking in to that that the ball will
be lower in the cup with the 5/16 and not just the
diameter difference
To the OP... if you were to say the same year engine
the lifters are the same... never knew why they had
different P/N but the measurements were the same...
I have used B RB lifters in my small blocks on
different cams... all of them were roller lifters