455 olds : with an AA & stock rockers what cam?

[UNCLE SAM]

If anyone out there is running a 455 Olds with an AA impeller and stock rocker
arms I would like to hear what results you get out of your set up.

[malcolm]

What compression ratio?

[UNCLE SAM]

Mine will be a pump gas motor, have not purchased pistons yet.

[malcolm]

Pump gas, regular or super? ;)
If you go low compression 8.5 (big dish pistons), I'd go with something like a 268 or 270 duration. If you go for the shallow dish pistons (9.75-10), then maybe a 280 or 292 duration. I'm building a 10.5 compression 455 with a Comp 280 right now. I'd like to try an AA impeller myself.
These are just my suggestions, I'm sure you'll hear others. I'm no pro race engine builder, just a mechanic that builds all my own stuff and has a soft spot for Oldsmobiles.

[RICHARD TILL]

like malcolm said, the comp 280 has .490 lift, the 292 has .518 lift and if you have the clearence and want a very radical idle, the 305 has .540 lift. all are 110 lobe seperation angle which is what you want. be sure to get new lifters and springs too. if you`re not pulling skiers and out for top end speed, get rid of that aa impeller or you`ll see people with less motor going around you.

[Taylorman]

.540 lift and stock rockers is bad juju.

[TIMINATOR]

***boat, the MAGAZINE, next month. 12 page Olds article. Read it. TIMINATOR

[maxwedge]

***boat, the MAGAZINE, next month. 12 page Olds article. Read it. TIMINATOR
Next month's issue...lets see, for people on the east coast, that issue probably arrived yesterday, I should get mine next month, and the west cost peeps, well... let's just say it'll come in a packet with a free t-shirt, the latest Rex catalog, and a brochure on Ice fishing in Hell. :D

[UNCLE SAM]

I will keep mu eye out for the magazine. Hopefully I will be on my way back together by then.

[396_WAYS_TO_SPIT]

I ran a 230@.050/.490 lift/110 lobe in my olds and it pulled hard. That was with stock valvetrain;)
396

[Taylorman]

Im running a 230@.050 with .517 lift. I ran it for a couple years with stock valve train. Im gonna but a AA in mine next winter.

[UNCLE SAM]

was that with an AA?