Quote:
Originally Posted by Coley
Interesting about the self-aligning rockers. So, stock-stamped GM rockers will not work with these heads? How is that determined? (again...interesting point).
On the current heads on my truck (and the spare '72 heads I have in the basement) the stamped stock rockers have a machined separate 'pivot washer' in them that resides between the rocker and the 3/8" rocker arm bolt.
Are these self-aligning or what is the difference in these vs. others?...if any?
The only thing I might do a rainy Saturday morning is gasket match them...that's probably about it.
All Good
Coley  |
Read the article on pocket porting, it's easy and much more productive than gasket matching.
And on gasket matching, you only need to do half of it. For instance, leave the intake manifold alone and simply enlarge the intake port on the head larger than the intake manifold port. Removes the restrictions, plus the resulting ledge fights reversion.
Same on the exhaust follow the direction of flow, leave the head port smaller than the header or ex manifold.
In other words, whatever port is leading the way needs to be slightly smaller or no larger than the port it goes into, and that is always true on the exhaust and always true on the intake unless you are running a supercharger of any kind. So, always enlarge the second port in the direction of flow if possible without damaging the equipment.
As GRX pointed out, your heads do not have pushrod guides just round holes where the pushrods go through the heads. Look at your 72 rockers they are flat where they rub the valve stems and the 72 heads have rectangular shaped guides in the heads to guide the pushrods unlike the heads you just obtained. You have to have one or the other if not the rockers will slip off the valves.
Look at the picture I posted and see the dimples on the rockers on each side of the valve stems, that's the only thing in this case keeping the rocker arms from slipping off the side of the valve stems. Here is another picture: