What cam would you recommend? Supposedly the bottom end was recently rebuilt .030 over. The heads are 6X and appear to be off a 1976 400. It has the Edlebrock Manifold and Edlebrock 600cfm vacuum secondaries with electric choke. It runs pretty good right now but it does suck the gas with that 4:11 rear end.
> Should I and what would I gain by putting on a set of 1.65 roller tip
> > rockers on my 69 Firebird with a 350. The 350 has been somewhat built, its
> > bored 30 over got an Edlebrock manifold and 600cfm carb and an HEI ignition.
> > It also has a big cam but not sure what it is but it must be big as my
> > manifold vacuum is only about 12 and I don't have any vacuum leaks.
> > Compression test showed between 117 to 121 in all cyclinders.
>
>
> Judging by your compression test, I would start by taking that "big"
> cam out. Stock 350s typically show 155-165 psi when cranking. It
> looks like someone rebuilt it using low compression pistons, then
> stabbed in a big cam. The result would be a soggy, fuel-swilling boat
> anchor. At this point, the motor needs more compression.
>
> The engine in my Camaro cranks at 205, which is a bit extreme. For a
> daily driven motor, it should crank at least 175, and preferably not
> over 200. BTW, if everything else were to spec, a set of FULL roller
> rockers would help. Roller-tipped ones really aren't worth the money;
> the pivot produces all the friction. A set of Comp's steel full
> rollers bumped my idle by over 300 rpm, and that was with the stock
> ratio. That's how much friction is in the stock valvetrain. Good > luck.
>
> Ken