Seeking Camshaft Knowledge

Can anyone expand my knowledge concerning early Buick V-6 camshafts.

I have reference to a camshaft GM part # 1362248 for 1962-1963 Buick V-6.
The Dauntless uses the same as the 1964-1967 Buick V6 or GM part # 1357868.

So what's the difference between them ? Any ideas ?

 

Honestly I Dont know. My speculation is was the stepped camshaft bearing design unique to the dauntless?

 

Apparently the Buick camshaft was changed prior to Jeep Dauntless beginning in 1964.
Jeep never changed it from the Buick 225 design.
All 198 and 225 camshaft bearings interchange from 1962 through 1971.

So anyway I'mguessing the lobes must have a different grind.
Duration or lift ? I'd like to know.
I expect it has something to do with this:
GM NOS BUICK 1962 1963 SPECIAL V6 PISTON & RING SETS KITS STD COMPLETE | eBay
That basically implies 198 vs 225 so how might the cubic inch difference effect the camshaft grind ?
Also I think 198 was a single barrel right ?
But then so was thevery early 1966 Dauntless.
So might the 198 camshaft have taller lobes to allow more fuel in ?
Maybe I'll buy the early NOS 1962/63 camshaft that I found and try to figure it out.

 

According to numberical sequence it certainly appears the 225 camshaft # 1357868 was developed prior to the # 1362248 that was put the Buick 198.
That being the case I would expect the 2 GM V6 camshafts to be different yet interchangeble.
Anyone know if GM normally followed numberical sequencing of part numbers ?

 

Virtually every part number on my '66 Chevelle increases numerically as new numbers superceded the previous, each being a more recent date as the part numbers got larger. Interchangable '67 parts had higher numbers.
-Donny

 

So if that sequencing holds true; it seems likely that the camshaft originally designed for the 198 Buick was replaced before the 198 went into mass production.
Then later about 1964 the original camshaft profile was then brought back into service when the displacement was increased to 225 cubes.

Of course this is all only speculation but that's what the numbers seem to indiicate.

 

If GM followed convention, I would guess the 225 cam would be slightly more "aggressive" due to both the increased displacement and slightly better induction. IMO, increasing the cam aggressiveness to compensate for the single barrel carb induction would be counter productive in every way.

 

Yeah that makes sense.
I take it that induction basically = lobe duration ... Right ?
Of course timing the lift to the piston cycle will also matter.

Anyway the original GM 198 cam was dirt cheap so I went ahead and sent off for it.
I'll compare it to an original 225 camshaft
Not sure if I'll be able to measure the open close / duration.

 

UPDATE:

Got my NOS 198 camshaft today.
Apparently John was dead on.
Its pretty darn hard to measure cam lobes with vernier calipers but...
Measured height of lobes and it appears to provide about .006" lesser lift than the 225 camshaft.

And I have no way to measure but it sure looks to me like the 225 lobes are more rounded and less of a peak.
That implies the 225 cam has longer valve open duration than the 198 cam.

So now has anyone ever compared the Comp Cam 252H lift to a standard cam lift ?
Is the Comp cam lift the same as std. or is it only a duration ("valve open") difference ?

 

I found a nice page with aftermarket grinds from back in 2000.
Takes a minute or two to go through all the different Buick engines.

Cam Name

 

FACTORY JEEP CAM SPECS 1946-1998
Engine Lift (inch)* Duration (degree)* Overlap
Intake/Exhaust Intake/Exhaust (degree)**
Rocker Ratio
(inch)
'46-'63 134ci, L-head 4-cylinder 359/.351 239/239 21/-NA
'50-'71 134ci, F-head 4-cylinder 260/.351 239/239 21/1.5:1

'80-'83 151ci, GM ohv 4-cylinder 265/.265 NA/NA NA/1.5:1
'84-'98 150ci, AMC ohv 4-cylinder 265/.265 270/270 46/1.6:1

'84-'86 173ci, GM V-6 231/.262 286/304 80/1.5:1
'66-'71 225ci, Buick V-6 250/.250 285/295 67/1.6:1

'54-'65 226ci, L-head 6-cylinder 352/.331 250/245 20/-NA
'63-'65 230ci, OHC 6-cylinder 250/250 250/238 30/1.5:1

'65-'77 232ci, AMC 6-cylinder 232/.232 256.92/256.92 35.92/1.6:1
'87-'98 241ci, AMC 6-cylinder 253/.253 270/270 46/1.6:1

'72-'90 258ci, AMC 6-cylinder 248/.248 263.37/263.37 42.36/1.6:1
'72-'79 304ci, AMC V-8 266/.266 263.49/293.52 71.5/1.6:1

'65-'68 327ci, Rambler V-8 254/.254 244/244 23/1.5:1
'68-'71 350ci, Buick V-8 240/.234 282/288 62/1.6:1

'71-'91 360ci, AMC V-8 266/.266 263.5/263.5 41.5/1.6:1
'74-'78 401ci, AMC V-8 286/.286 296.32/303.55 68.32/1.6:1