[b-man]

Originally Posted by Nyairguard

How much hp is gained when one adds 1.65 rockers to an 068 ? On a 400 engine


Sent from my iPhone using Tapatalk

A few horsepower maybe and maybe not. No big gains and probably not really worth doing.

The beauty of using a factory performance cam like the 068 along with stock 1.5:1 rockers is the valvetrain can stay completely stock, no need to mess around with anything.

Just use a good brand of stock replacement type valve spring and it’s always best to change out the factory bottleneck rocker studs to straight 7/16” studs for the sake of ultimate reliability. Not that the factory pieces won’t work but the straight studs are much stronger and a fairly inexpensive upgrade that’s smart to do.

[unruhjonny]

Originally Posted by 77 TRASHCAN

Bart,
Butler just (last year) released a line of cams. I believe the 067, 068, 744 and 041 in flat tappet and HR versions. I'm guessing these grinds are still for sale???

I seem to remember reading this, and in fact it wasn't as close as i would have hoped.



(I had to resize this a couple times so that it would upload where you could read it)

[Nyairguard]

i ordered my valve springs from spotts and found some crane retainers and hardened locks, the 16 heads already are screw in type have bbc studs for them and have the larger factory valves also, I tried to cancel my order after being on hold for 43 minutes with jegs for a set of eagle rods that are pressed pins style, think I need the bushed style the pistons I like are the ic9946 they say fit both, I need to call them as the spec is .980 pin not sure that will work with the jegs eagle rods. and go with the ohio crank bushed style,, the eagle are part SIR6625PP no bushing i seen summit also has PON66258H those have the bushings.. still learning good thing for good return polices

[Nobuddy]

Originally Posted by unruhjonny

I seem to remember reading this, and in fact it wasn't as close as i would have hoped.



(I had to resize this a couple times so that it would upload where you could read it)

The Ram Air Series "style" camshafts Butler introduced last year are not the Melling pieces like in that chart. New custom grinds by Comp in both HFT and HR and not clones of the factory parts. These are their "068" style cams.

Part #: CCA-BP-RA-068-FT
INT/EXH @.050 212/225 256/268 Lift .405/.405 @1.5 Ratio LS 115 Hyd. Flat Tappet

Part # CCA-BP-RA-068-HR
INT/EXH @.050 212/226 267/281 Lift .450/.450 @1.5 ratio .495/.495 @1.65 ratio LS 115 Hyd. Roller

[unruhjonny]

/\/\ thank you for your reply.

Incase it is worth mentioning, I made that chart in an attempt to compare all available cams vs what my car's original was - and what is PSMCD legal for my car.

I made it with the information I could find last year - so in the case of a Butler cam, I used info directly from their site;
So if I already had a line in my chart for a cam that read to be EXACTLY the same, I would add the notes in my last column.
The only cams on that chart that appeared to be Butler exclusive, or the same as one that Butler had was the first and fourth cams.

I cut off the bottom of my chart to make it readable here before it got to the 068 (or larger) cams.

Since this discussion was (at least partially) speaking about the 067 cam (note whom I replied to), I could speak to 'purported' 067 camshafts, as this was the genesis of my chart.

[unruhjonny]

Ok, so I went back to Butler's site, and I do see a cam that I appear to have not noted last year;
But again, it looks more like a 066 than a 067 cam;
Butler 067 RA camshaft page
It has the same 111degree lobe centerline as the 066, and the @ 0.050" duration appears exactly the same as the 066 - but the advertised duration appears to be less than that of the 066 or the Howards/Summit 417131-11 camshaft...??

I think that if someone is looking for a 067 replacement they could just as easily go for either a 068, or '067HL' (aka: Summit 2800) will suffice well - if those options are not appealing, then as a Pontiac enthusiast, you more or less have to downgrade to something akin to the 066.

[unruhjonny]

Since this was essetially the part of the thread I was replying to, I'll quote it:

Originally Posted by 694.1

Interesting, I had found a Summit 2800 during the Great Cam Shortage and it looks to be between the 066 & the 068 but not quite an 067.

Actually the 2800 grind, according to Spotts (noted last year) was introduced by Nunzie/HO Racing/Warrior as the 067HL;
profile number / @0.050 I / @0.050 E / adv I / adv E / I lift (1.5r) / E lift (1.5r) / LSA:
066 / 200 / 210 / 273 / 282 / 0.406 / 0.406 / 111
067 / 200 / 213 / 273 / 289 / 0.406 / 0.406 / 114
067HL / 204 / 214 / 278 / 288 / 0.421 / 0.443 / 112

The only two points where the 067HL/2800 appear smaller than the 067 are:
One degree less advertised duration on the exhaust;
Two degrees less lobe separation angle;
Everything else is more than the 067 - as a matter of fact, as I have understood it, the 0.050 lift numbers tell more than the advertised numbers.

[Stan Weiss]

I don't have anything on a 067 by Nunzi. This shows a Nunzi 068 and a Pontiac 068.

Stan

[mkpontiac]

The 067 and 2800 cam were mentioned in this thread. The Max Performance Pontiac book has the 067 at 113 LSA and 113 intake centerline. I would expect the wider LSA and later intake closing to be less prone to pinging compared to the 066 and 2800. It would also have a flatter torque curve and likely rev a little higher than them. I would expect the 068 to have the same relative differences compared to the 2801. Obviously there is something to gain by the higher lift numbers of the Summit cams but higher ratio rockers would offset some of that on the Pontiac cams. At least that is how I understand things.
Mark