[PunchT37]

Running 1.5`s. 1.65`s puts it at 660 lift. This is a street car. Crane 99893 spring.

[Gach]

Whats spec’s on Road Paver cam

[PunchT37]

Originally Posted by Gach

Whats spec’s on Road Paver cam

306/314
246/252
400 lobe
112 sep107.5 ICL

[Gach]

Originally Posted by PunchT37

306/314
246/252
400 lobe
112 sep107.5 ICL

Oh that’s a nice cam, for your combo.

[PunchT37]

Originally Posted by Gach

Oh that’s a nice cam, for your combo.

I might put it on 114 for 505 cubes.

[PunchT37]

Why they call it Road Paver.

But, I can’t rotate these pics.

[Steve C.]

Dave Bisschop likes to use Comp lobes 3115B and 3116B.

He calls it the "road paver".

306 / 314
246 / 252
.4000" lobe lift
More often than not ground with a 112 LSA

Keep in mind if changing from a hydraulic roller cam to a solid roller cam you would add duration. Not a recommendation here, but something like a Comp 254 degree solid roller lobe would certainly not be overkill in a 505.
On the intake side I'm currently using Harold Brookshires tried and true 288 solid roller lobe. It has 255 at .050 and .4176' lobe lift. Peak power 5600-5800 depending on the pull.


.

[i82much]

Originally Posted by PunchT37

Running 1.5`s. 1.65`s puts it at 660 lift. This is a street car. Crane 99893 spring.

i am impressed by how high it revs, you always hear hyd rollers won't pull those rpm's ....

[PunchT37]

Originally Posted by i82much

i am impressed by how high it revs, you always hear hyd rollers won't pull those rpm's ....

I’ve got the box at 6500. 5800 to 6000 seems to be it’s “happy place”.

[Formulajones]

Originally Posted by i82much

i am impressed by how high it revs, you always hear hyd rollers won't pull those rpm's ....

Oh there are hydraulic rollers these days that will turn 8000 rpm and live. They get pretty in depth with lobe profiles and lightweight parts.

I turn my hydraulic rollers up to 6500 without a problem, at least the ones that make power up there anyway.

[i82much]

Originally Posted by Formulajones

Oh there are hydraulic rollers these days that will turn 8000 rpm and live. They get pretty in depth with lobe profiles and lightweight parts.

I turn my hydraulic rollers up to 6500 without a problem, at least the ones that make power up there anyway.

i thought pontiacs needed beehives and titanium retainers to pull 6500.

[PunchT37]

Originally Posted by i82much

i thought pontiacs needed beehives and titanium retainers to pull 6500.

Mine don’t.

I will say, after 6200, you can feel it fall off. So, on 505 cubes, 5700 to 5900 is prolly the happy place. So, beehives shouldn’t be mandatory.

[Formulajones]

Originally Posted by i82much

i thought pontiacs needed beehives and titanium retainers to pull 6500.

Possibly. Lightweight parts are always a good idea, and the valvetrain on a Pontiac is a bit on the heavy side to start with anyway.
6500 wouldn't be that hard to pull off though with a hydraulic roller as long as the engine is making power up there.

We don't have any of the beehive stuff on dad's 571 Pontiac. Those heads were converted to a 2.19 intake valve which is a bit heavier, then had Paul spec the dual springs for the Hydraulic roller, I set them up at the install height he recommended. 160 lbs. seat pressure and 420 open. I think the retainers are titanium though. Dad repeatedly puts that thing on the chip, the engine revs up quicker than he can shift the darn thing. Has a 6300 chip in it and he's all over it all the time. It runs right up there no problem. On the dyno it was done making power however at 5800 rpm but still carried nicely just past that.

My chevelle has slightly heavier valve train (BBC) with a similar dual spring setup. 2.25 1.88 valves that aren't fancy lightweight stuff. Again it does have titanium retainers. BBC's are horrible about valvetrain weight and can sometimes have valvetrain issues as well. Hydraulic roller and it zings right up to 6500. Made peak power at 6300 but runs best times when I shift at 6500. Rev limiter at 6800. That engine has been together 25 years doing that LOL