454 Timing help

[KerrLake]

I need suggestions on what to set the timing to on my engine. A quick overview of its build is as follows:

Bored 30 over
Isky 270/280 cam with the following profile:

ENGINE INFO: CHEVY BIG BLOCK V8 396-402-427-454 CU.IN. APPLICATION:
SPECIAL REMARKS: HYDRAULIC PRODUCT USE: STREET/STRIP

RPM RANGE: 2200-6500
Valve lift is calculated with zero lash and rocker ratio of 1.75
INTAKE TIMING DURATION: 270 deg.
OPEN: 21 BEFORE TDC
CLOSE: 69 AFTER BDC
CAM LIFT: .310"
VALVE LIFT: .542"
VALVE LASH: . HOT
. COLD
EXHAUST TIMING DURATION: 280 deg.
OPEN: 74 BEFORE BDC
CLOSE: 26 AFTER TDC
CAM LIFT: .323"
VALVE LIFT: .565"
VALVE LASH: . HOT
. COLD


LOBE CENTER: 114 deg. OVERLAP: 47 deg. CAM ADVANCE: 0 deg.
THE ABOVE TIMING IS CHECKED AT .007 (OPEN) LIFTER RISE
.008 (CLOSE)

The following timing is taken at .050" lifter rise and gives a more accurate determination of camshaft position.
INTAKE DURATION: 221 deg.
OPEN: -3.5 BEFORE TDC
CLOSE: 44.5 AFTER BDC
EXHAUST DURATION: 232 deg.
OPEN: 50 BEFORE BDC
CLOSE: 2 AFTER TDC


Stock style pistons

RPM performer aluminum marine heads

RPM airgap intake

Holley 800 cfm

Dana exhaust with Vortex IV risers

What is a safe timing setting?
Thanks in advance

[f_inscreenname]

Should still be 10*BTDC but mine still likes a tiny bit more.

[BUIZILLA]

14 with 93 octane

12 with 89 octane

[needadonzi]

Total timing is more important than initial timing. Around 32 - 34 degrees all in by 2500 - 3000 RPM. Just back off a bit if you hear detonation. At least thats what I run in my car.

[BigGrizzly]

My preference is 30 to 32 total on that combo.

[wagspe208]

Please pardon my ignorance by asking, but...why are you guys so afraid of timing? Is it an outdrive thing...lugging the engine at low rpms? There it a ton of power being thrown away. Especially if you are running 9 to 1 pieces.
Initial timing doesn't mean anything to speak of. Just needs to idle. (again, outdrive thing?) Total timing...in by 3000 rpm max is what matters. I have a v-drive, so gearing is not an issue. I can run 36 degrees of timing all day on 93 gas. I could run 38, but I do not know what the internals are (used boat).
Again, I am not lugging the engine at low rpms...where volumetric efficiency is at its peak.
Thanks for enlightning me why an engine in a boat can't run any timing.
Wags

[mrfixxall]

seems i gave you that cam application,i had the best luck and made the most power @ 12 degrees intial and 24dg advanced = 36 total with 93 octane,providing you degreeded the cam rite:wink:

[mrfixxall]

Please pardon my ignorance by asking, but...why are you guys so afraid of timing? Is it an outdrive thing...lugging the engine at low rpms? There it a ton of power being thrown away. Especially if you are running 9 to 1 pieces.
Initial timing doesn't mean anything to speak of. Just needs to idle. (again, outdrive thing?) Total timing...in by 3000 rpm max is what matters. I have a v-drive, so gearing is not an issue. I can run 36 degrees of timing all day on 93 gas. I could run 38, but I do not know what the internals are (used boat).
Again, I am not lugging the engine at low rpms...where volumetric efficiency is at its peak.
Thanks for enlightning me why an engine in a boat can't run any timing.
Wags

me no afraid ive had mine little mouse at 40 and it liked it:) but kept it at 36 to be safe..

[KerrLake]

You did put me one that cam Mr.Fixall. It sounds great. I haven't done any real runs yet, still getting it broken and dialed in.

[mrfixxall]

You did put me one that cam Mr.Fixall. It sounds great. I haven't done any real runs yet, still getting it broken and dialed in.


well lets see some pics of this bad boy and mabe a little video clip of it running too..