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#21
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Subscribed
Subscribed
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1968 Firebird 400, 068 cam, TH400 & 13" Continental Converter, Auburn posi with 3:08 factory gears, Cliff's Q-jet resting on a 68 factory iron intake, DUI HEI and Ram Air pans and RARE Long Branch Manifolds |
#22
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If I am ordering a cam for a traditional Pontiac, shouldn't the base circle be the same? |
#23
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This is why the big boys use 55mm or 60mm cam bearing bores in their aftermarket blocks, instead of stock-size cam bearing bores.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#24
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Base Circle, Lobe Lift and Cam Journal Diameter
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Like B-Man Stated, as the Lobe Lift is Increased, the Base Circle Diameter is Often Reduced. By Reducing the Base Circle Diameter You've Actually Increased the Lobe Lift. Keep in Mind that the Height of the Lobe CANNOT Exceed the Diameter of the Cam Journal. If it did you wouldn't be able to install the Cam in the Block. The Lobes couldn't get past the Cam Bearings. In My Experience with the Pontiac Lifter "Oil Band" Issues, I have had Camshaft and Lifter Combinations that Actually Allowed the Lifter to Ride so far down in the Lifter Bore that the Oil Band was Sticking Out below the Base of the Lifter Bore. The Cam and Lifters were from the Same Manufacturer. I think that answers your question. Larry S.
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---------- http://www.pas4performance.com Proud to Say, "Made in the USA" ---------- |
#25
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Crowers are Johnson and they are SBC with diff link bars.Just look at the part numbers,same but with diff letters after the body number.The new Comp bodies are diff from the old and virtually all the other Hyd roller lifters I have looked at.I would almost bet they are SBC bodies thou.I just know I have 3 engines running them at this very moment and no noise.From 380 to 400 lobe lift Comp high lift Hyd roller cams.They are in my 366 RA V engine,my 455 RAIII clone engine and a KRE headed 455 engine and am putting a new set in my 421 SD engine now.FWIW,Tom
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#26
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Subscribing.
I have a set of Howard's, which are Morel, haven't installed yet, and would prefer to get it right the first time. EDIT: I have a set of Howard's in the Olds engine, they were noisy at first, then quieted down, figure there was packing goo hardened in the bodies. (that flushed over time). Same part number as the Pontiac lifters. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#27
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize. 1977 Trans Am W72 400, TH350, 3.23 T Top Everyone you will ever meet knows something you don't. Bill Nye. Last edited by TedRamAirII; 06-06-2016 at 12:59 PM. |
#28
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.
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#29
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Whats funny is the pic for a regular lifter looks different from Pontiac to Chevy, but not the roller?
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize. 1977 Trans Am W72 400, TH350, 3.23 T Top Everyone you will ever meet knows something you don't. Bill Nye. |
#30
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I prefer when pics are actually posted to the site, since then it's here to stay. I've gone back on thread searching stuff and found where the link was defunct, because the pic had been removed from the external location. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#31
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Morel Lifters and Off the Shelf Hydraulic Roller
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I'm assembling a Pontiac 400 right now and it has the Morel Lifters and an "Off the Shelf" Hydraulic Roller Cam. The Oil Band is Too Low for Sure. I'll be modifying these lifters. Let me say something about the Oil Band... It's Only an Issue with Hydraulic Flat Tappet Lifters and Hydraulic Roller Lifters due to the Operation of the Lifter Itself.... On a Solid Roller and Solid Flat Tappet Cam you'll find that the Oil Hole in the Lifter Body, in most cases, is PURPOSELY NOT Supplied Oil 100% of the time. This is done for "Oil Metering" Purposes. In Fact, Often Times the Lifter has what is known as "Edge Orifice" Oiling. That means that the Oil Hole isn't Located Inside the Oil Band at all. Instead it's Located Along the Smooth Portion of the Body of the Lifter. BUT, Even with a Solid Flat Tappet Lifter or a Solid Roller Lifter, Make 100% Sure that the Top or Bottom of the Oil Band DOES NOT Protrude, or Stick Out, Past the Lifter Bore while Riding on the Base Circle of the Cam or at Max Lobe Lift. If it is and you don't catch it, the Lifter Bores will Wear Out Quickly because the Lifter Body will not be Properly Supported. Larry S.
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---------- http://www.pas4performance.com Proud to Say, "Made in the USA" ---------- |
#32
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Suscribed. I am running older CC Hyd Rollers.
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#33
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
#34
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Good job getting deep into this..
Hopefully my build will benefit from what you learn here..
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-- James Work '67 GTO Convertible "Koerner Built 413 500 hp with a Victor!.. I'll run a stock intake." '75 Formula 400 - Daily Driver - Running with my Home Built 455 and TH400 Details here: http://forums.maxperformanceinc.com/...d.php?t=588372 |
#35
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subscribing as I'm looking at roller cams at this point.
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-Jason 1969 Pontiac Firebird |
#36
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So since the later Comp Camps HR lifters, part# 857S seem to have few complaints, is this now the preferred HR lifter?
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#37
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i have the new comps on the OF cam. it did not take long for my top end to see oil the first time i primed the engine, and my lifters are not noisy. perhaps the ia2 galleys are in a different place?
on the other hand, it seems like you might be able to get enough oil in the lifter even if the band does not see the oil galley on the base circle. you still get oil in the way up and in the way down, the question is can you meter it so that is enough to keep the lifter from collapsing? what kind of spring pressure are you running? |
#38
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Quote:
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-Jason 1969 Pontiac Firebird |
#39
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Here's a pic of the Howard's boxed Morels...
The rule is even with the body, the pic makes it look like it isn't. (crappy phone pic) .
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#40
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You mean if the base circle gets smaller?
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