Turbo4271

Newly rebuilt engine. New Pistons, heads, Edelbrock 3790 cam kit, timing gears & chain, distributor, carb. Rings & bearings, and headers.
Did proper break in, and drove it about 2mi.
It took for ever to get up to 55mph and it acts like it won't go any faster. Had more pickup before rebuild when only running on 5 cylinders. Initial valve adjustment on engine stand was "0" lash then 1/2 turn more as per Edelbrock instructions. Timing at 8 before TDC.
Starts right up, and idles smoothly without touching accelerator. What are your thoughts on not enough lifter preload?

Turbo4271

drdave88

iTrader: (3)

I'd assume it's the same, but on the F bodys the base timing is 10 degrees BTDC. I'd try adjusting the timing somewhere between 10-12.

Turbo4271

Sierra6

what break in oil did you use?

Turbo4271

Sierra6

hopefully it has high zinc like these flat tappets need.

scooter

iTrader: (11)

Camaro, not Camero

Sierra6

yeah i see it spelled in for sale ads incorrectly more often than correctly.

scooter

iTrader: (11)

Me too, still doesn't make it right, lol

drdave88

iTrader: (3)

Good point, I found that out the hard way before I swapped my cam in my 3.4, that oils didn't come with that anymore. It's not really a well known thing unless you're up on your oils.

Sierra6

yes, and many of those who are up on it still think rotella has enough zinc in it but it doesn't anymore.

zs&tas

Would love to help but I don't know anything about the carb set up lol how's the carb set ? Fuel pressure and metering, and how the advance on the dizzy is so controlled ? Vacuum ?

Turbo4271

zs&tas

You can check the cam from the pushrod rocker movement, just in case . I'd check the comp ratio ? After a rebuild ? Def bump the timing maybe the dizzy isn't acting how it should ? Just some ideas.

Turbo4271