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Old 02-18-2020, 11:33 AM
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Default 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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Old 02-18-2020, 11:59 AM
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Hmm, I'm actually kinda liking that 066 cam.

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Old 02-18-2020, 11:59 AM
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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.
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Old 02-18-2020, 12:05 PM
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Put the 066 in it.

Drive happy.

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Old 02-18-2020, 12:29 PM
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067 not available aftermarket.

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Old 02-18-2020, 12:29 PM
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Quote:
Originally Posted by ponyakr View Post
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.
Yeah right now a spring swap isn't in the cards here so I'm not considering anything at all that would possibly need new springs.

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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Old 02-18-2020, 12:43 PM
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Quote:
Originally Posted by abefromen View Post
067 not available aftermarket.
Yep.

No exact copies available to my knowledge.

NOS only.

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Old 02-18-2020, 12:47 PM
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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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Old 02-18-2020, 12:50 PM
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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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Old 02-18-2020, 01:11 PM
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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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Old 02-18-2020, 01:14 PM
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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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Old 02-18-2020, 01:24 PM
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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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Old 02-18-2020, 01:28 PM
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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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Old 02-18-2020, 03:31 PM
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Where would you want to see peak HP RPM and redline for this engine?

Stan

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Old 02-18-2020, 03:55 PM
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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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