Advance Curve for 11:1 LA Street Engine

Posted By: 4spdana

Advance Curve for 11:1 LA Street Engine - 01/30/15 10:49 PM

whats a ball park figure for the advance curve for this engine, and should i use a vacum advance? (i have one for an additional 8 deg's)
i believe 33 total for race and let it go to 41 for light throttle cruising.
your thoughts...
basic or initial timing
total
and total for crusing
408 in a 70 Cuda automatic, RPM heads super prepped/CNC'ed
11.2 comp,
Hyd Roller
106 Lobe Seperation
236/242 @.050
.560 lift @Retainer w/1.6 rockers
car weighs about 3200
aprox. 2000 stall
3.55 gear

Posted By: RapidRobert

Re: Advance Curve for 11:1 LA Street Engine - 01/30/15 11:39 PM

Quote:

your thoughts...

In order: (1) initial with vac gauge method (2) total to 35 (that initial+slot length) (3) springs (4) plug in/adj can. see recent (ign) threads for more info to consider

Posted By: autoxcuda

Re: Advance Curve for 11:1 LA Street Engine - 01/31/15 12:17 AM

I have a 416 stroker with prepped E-brock heads and similar duration at 0.050 with a comp 274-S solid flat tappet. But 110 centerline and less lift with 1.5 rockers.

I run 91 octane pump gas, have 9.8:1 actual measured compresssion, good quench and I'll ping with 34 total (no vacuum advance) under heavy load warm day. Iirc, I'm running 31 total.

Imho, 11:1 is too much compression if its actually been measured with proper tools to be that. Maybe the specific cam timing events will bleed off some compression.

Posted By: ademon

Re: Advance Curve for 11:1 LA Street Engine - 01/31/15 03:48 AM

I have 11.2, j head, with a 200psi cranking . That very low stall is not going to help. I run 93, MSD with very cold plugs, hi stall 4,400, lighter car 3,260, no manifold heat, hood scoops let cold air in. I run 30 total on a msd dizzy no VA. On the strip I would add a few gallons of 110 to be safe.

Posted By: ademon

Re: Advance Curve for 11:1 LA Street Engine - 01/31/15 03:53 AM

I think with that cam and heads you'll be ok. I think you could go a little more duration like 240 to 244 @.050 and that would help even more.