max duration @.50 for street strip cam...
 

with or without a vacuum can. 406 79 t/a 3500 stall #12 heads. 3:73 rear. Also why is a dual pattern cam better than a split pattern cam.

The "street/strip" cam in my 467 has a whopping 0.272/0.275 duration. With the 3,500 converter, I'd consider it somewhat streetable. Sounds good.

It's actually overlap that is the critical number in determining streetability (vacuum). You can have large 0.050" duration numbers but with a wide lobe center you can actually have decent idle vacuum numbers. 18 - 19 deg (at 0.050") of overlap for a 455 will be around 10-11" of idle vacuum (assuming enough initial timing, tuning, etc.). For a 400 ci, you prob need to be around 13-14 deg of 0.050 overlap. These vac numbers will be on the edge for needing a vac can.

I'm running 7-7 1/2" vacuum @ 1150 rpm on the street and don't need a vac. can

What cam? -Jim

UD 288/296 (108 ls) solid / flat in a 440" deg in @ 102

Manual brakes = no vacuum can = no limit on street cam duration. :thumbup:

my preference is nothing bigger than a [email protected] for a street car. you should have decent manners with that one. anything bigger and the 'trade-offs' will begin...

I ran a 254/262 (@ .050) solid roller in my pump gas combo for a few years without issue. Power brakes and no vacuum problems.

I bet my 280/284 will be nice on the street too, but I might need that Vacuum can. ;)

The Crower 60243 is a very good choice for the 400 with #12 heads. It will be well suited to the 3500 stall speed converter.

Vacuum at idle will be around 12" at 900-1000rpm's. It is about as big a cam as I would recomend for the application, and will make at least 425hp and around 460tq with unported heads.

The specs are 228/235/112. We like to see the ICL right at 108-109 degrees....Cliff

My RAIV 400 ran well and the A/C also with a UD 288.296 231/239 108 LS cam. Power brakes were even fine with a 304/312 UD. A little lumpier. Having the higher stall helps that.

Hydroboost brakes = no vacuum can = no limit on street cam duration = still get to have power brakes = best of both worlds

power brakes on a hotrod?..wtf has the world come too?..manual brakes done correct require very little pedal force..and have less problems too..4 wheel drums even stop well if done correct..my bird used to stop just fine at 132 mph, with factory drums..learn the basics..then cam the hell out of the engine and go have fun..

we habitually run bigger than 230 degrees..more like the 290b6...and you know when ya mash the throtle something fun is gonna happen..

Yep...power brakes, tilt, cruise, power steering, and overdrive....this IS the street section....May be adding power windows soon too.....smoke 'em if you got 'em....

Thanks, for the replys just seeing if I could go higher then the crower 60210 I have in there now. Was looking at the comp 292h. Even though some say street pontiacs don't like single patteren cams, and run power brakes.

67 lemnas whats hydroboost brakes?

Skip what are the specs of the ud 304/312 cam @0.50 and lift?

The Comp Cams 236/242 @50 hydraulic roller is the biggest I would use on the street. I used it so I know. Anything bigger is too rough an idle. I know a guy who used this cam in a 455 and ran 11.70s in a 73 T/A with a/c!

This the Street section. No vacuum needed for manual brakes, true.... but Pontiac used vacuum to control a lot of other accessories such AC controls, vents/dampers, etc.

If your close to the edge of suitible vacuum with power brakes or trying to find the edge, you better check your insurance and driving style. I have a can and power brakes and still have issues in parking lots..... the pedal will sometimes be hard as a rock. Once the booster opens the valve, everything is fine. The max vacuum for me is 11 inches (with a can). Also the can is not going to make more vacuum. It's only going to store it for later use. Hope this helps your decision.

I would like to keep it hyd non roller, cause I don't have a budget for hyd roller.