When you advance or retard the cam you change the intake amd exhaust centerline in relation to the crankshaft. The LSA or LCA is what is ground into the cam and cannot be changed.

My cammed L31...

If the LT4 Hotcam was not making torque it had a bad tune or was timed wrong. That cam will BOIL tires off even at lower RPMs. In an engine under 10:1 it needs to be advance 3° and installed on a...

Really have not had a chance to dig out the tuning laptop and look. Been building a L30 305 Vortec to swap into an Astro van this weekend.

That is very similar to the Mercruiser 2" bore to square bore TBI to carb intake adapter I have in my garage that came on a 405 hp 502 TBI.

Thats the one I use, works quite well for me on stock to mildly cammed vortec head engines.

You would have to manually input the numbers since the tables are not exactly the same in regards to RPM/MAP values and overall dimensions.

That XDF file is one I added the TCC paramaters into for...

Set your injector flow rate, add the vortec timing table I posted from the Suburban I tuned last summer, and then start working on you VE tables. You can put my timing map in both the off-idle and...

To support ~300 HP at a .5 BSFC with 2 injectors at 85% duty cycle means you need 88 lbs/hr per injector. To get 88 lb/hr from a 61 lb/hr @ 11 psi injector means you fuel pressure needs to be about...

Gross vs Net HP rating and the fact you have long tube headers and full catless exhaust rather than those god awful manifolds and tiny 1 7/8" head pipes of a factory vortec truck. Also the TBI on a...

I think you are under estimating the HP. Iys more like 300-310 hp. You are going to need either larger injectors or alot more fuel pressure. I have a decen bin file I could dig up but you will...

Some may consider WinALDL absolete, but it is still one of the easiest things to use for many GM vehicles and has many pre-configured history tables.

I can generally get them driveable in 1 or 2 stabs. The last Vortec head, cammed 350 TBI setup I tuned using the abysmally slow 7747 data stream I had on the money in about 6-7 burns total. It was...