2.8 rockers

[a***@aol.com]

What rockers are best to put into a stock 2.8 to get just a little
more power?

[Les Benn]

I am not sure that rockers alone would do much of anything. If you want to
add HP to the engine you would get more out of porting the heads, doing a
Valve grind, change the cam duration and lift. maybe then get roller
rockers. A guy I once knew had a turbo added to his car, but you definitely
need to make sure the bottom end is up to snuff to add tons of power. if the
Stainless Borla exhaust or similar is still available that might buy you 10
HP or so.

Post by a***@aol.com
What rockers are best to put into a stock 2.8 to get just a little
more power?

[a***@aol.com]

Post by Les Benn
I am not sure that rockers alone would do much of anything. If you want to
add HP to the engine you would get more out of porting the heads, doing a
Valve grind, change the cam duration and lift. maybe then get roller
rockers. A guy I once knew had a turbo added to his car, but you definitely
need to make sure the bottom end is up to snuff to add tons of power. if the
Stainless Borla exhaust or similar is still available that might buy you 10
HP or so.

Post by a***@aol.com
What rockers are best to put into a stock 2.8 to get just a little
more power?- Hide quoted text -

- Show quoted text -

Would those rockers work as direct replacements then?

[B Fuhrmann]

andrewj wrote ...

Post by a***@aol.com
What rockers are best to put into a stock 2.8 to get just a little
more power?

Herb Adams (Pontiac engine guru that raced Fieros) said that 1.6 high lift
rockers can boost the power with very little investment.

I don't know where to find the article online now. It was in a kit car
magazine and called "All Fired Up". The article had details of what he
learned on setting up the Pre 88 suspension and V6 engine for racing.

[Capt Fiero]

You have a few options.

1.6 stamped steel rockers from a SBC V8, then re-use your old ball and nut.
1.6 stamped steel rockers from a SBC and get new "adapter studs" that use
the 3/8 stud / ball and nuts.
1.6 full roller rockers with the adapter studs
1.52 roller tip rockers
1.60 roller tip rockers

I would not recommend the 1.6 stamped steel rockers as they will shorten the
life of your valve guides and seals.

Your simplest swap is a set of 1.6 roller tip rockers and then re-use your
old ball and nuts. I have done both 1.52 and 1.6 on several cars, including
one car that had a high lift cam and added the 1.6's on top of that.

The gain from the 1.6's is an overall better intake and exhaust flow rate
through the head. The gross lift at valve will be increased. roughly .030
(stock is about .400 cam lift, with the 1.6 rockers you get about .430 lift
at cam.) Although the rockers don't increase your seat to seat duration,
due to the fact the valve is open further it spends more time over the .350
area of the curve. So it helps in that area as well.

I have built and raced 4 2.8's before finally giving up on them when
reliability became a factor just over 200hp mark. I moved on a 4.9 V8 as I
have lots of room to grow in the 4.9. Its starts at 200hp and goes up from
there.

Post by a***@aol.com
What rockers are best to put into a stock 2.8 to get just a little
more power?