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#1
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067 or 068 Cam in stock 350...Rhoads lifters?
Some of you may remember I've been helping out a friend with his build and sent him an old (late style) P4B manifold to replace the 2bbl setup on his factory stock 72 Lemans 350.
He scored a carb recently and set about to swap the intake and carb this weekend. In doing so he pulled the valley pan as it had been leaking as well. Inspection revealed one lifter that had started to mushroom. The face had not gone concave, but the lifter edges were showing signs of distortion and there was some slight marring on the cam lobe. Fortunately he caught this now before it became a much more expensive issue. Anyhow, long story short, I can't let him put it back together like that, so I'm helping him out with a cam and lifter set. Had been thinking about the 067 even possibly an 068, but I think that's just too much for the low comp engine. My wonder however is the use of rhoads lifters to help out. Thoughts? His car is still in the driveway torn apart, so I'd like to get parts to him ASAP. Car is a 72 Luxury LeMans, stock engine with about 53K miles on it. Not in the cards right now to change springs, so I'm only looking at factory cams that can go in right away and get him moving again. The car does have a 700r4 in it, so he's got that steep first gear in it to help out with some loss in low end with a slightly larger cam than the 555 that's in there. The other thread kind of got off topic with varying opinions on these cams, so I'm open to any suggestions. The goal is just a bit more power from the 350, but being able to maintain good manners.
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-Jason 1969 Pontiac Firebird |
#2
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Hmm, I'm actually kinda liking that 066 cam.
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-Jason 1969 Pontiac Firebird |
#3
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Main problem with the Rhoad lifters is their current price. You can buy any of the Summit cams, with lifters, for LESS than the price of a set of Rhoads lifters.
I think several here have mentioned using the 2800 Summit cam, in a 350. Don't know if the 2800 will work with stock springs, or not. I suppose it would depend on how much pressure the springs still have, & the max rpm the engine will be taken to. Someone ask the spring question to Summit. They replied that it will work with NEW stock springs. Not real sure exactly what brand & part number springs would be considered "new stock springs". 066 cam was used in low CR '74 GTO 350 engine. Don't know if the same springs were used as with the smaller cams, or not. http://www.wallaceracing.com/enginesearch4.htm I suppose there are guys here who can calculate exactly how many rpms are safe with any given cam with any given spring pressure. I'm certainly NOT one of those guys. trying to get by with original used factory springs would be a complete trial & error deal for me. Last edited by ponyakr; 02-18-2020 at 12:15 PM. |
#4
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Put the 066 in it.
Drive happy.
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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 |
#5
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067 not available aftermarket.
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#6
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Quote:
Pretty sure I'm going to go with the Melling SPC-4 and get him a set of Johnson HyLift lifters. I'm trying to save a low mile engine from needing a rebuild, I'd hate to cause one with a cheap lifter.
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-Jason 1969 Pontiac Firebird |
#7
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Yep.
No exact copies available to my knowledge. NOS only.
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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 |
#8
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The Melling SPC-5 is close to the 067, but slightly different. Same deal with the SPC-4 I'm looking at here, close to the 066, but not quite exact.
These 72 2bbl 350's were advertised at 8:1, but it's likely closer to 7.6:1 or so. Just thinking going any bigger than that SPC-4 is asking for a poor experience.
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-Jason 1969 Pontiac Firebird |
#9
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Another vote for the 066 cam. Sealed Power's part number is CS641
The compression ratio is toolow on that 350 to have much more cam in it....
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#10
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Just be aware that the 2bbl motors only have a 40 psi oil pump ( not a 60 lb ) with a 5/8", not 3/4" pick up tube!
Installing any camshaft like even the 066 with good / new spring that will allow the motor to buzz to 5500 rpm is a bad idea if you ask me unless you / he up grades the oil pump. Also don't forget the timing chain and gears!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#11
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Good call, that will be later.
Also looking at the comp 252h here on Paul Knippen's advise. Timing chain and gears were replaced last year, so he should be good to go in that department.
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-Jason 1969 Pontiac Firebird |
#12
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I ran a 068 in a 366 in a 63 tempest wagon with a 2 speed auto and had no issue in every day driving,had factory lifters.Just a over bore 350.They used the cams in 389s just not that much diff IMO.Tom
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#13
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We'll see about a low restriction filter until then and when looking at aftermarket Cams don't go above .450" lift due to the heads pressed in rocker studs.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#14
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Where would you want to see peak HP RPM and redline for this engine?
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#15
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shifted at 5000 rpm, with peak power just before that, 4700ish or so.
lumpy idle okay and to some extent desired. Probably not possible considering the limitation of factory valve springs/valvetrain.
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-Jason 1969 Pontiac Firebird |
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