I like the Crane. It idles like stock and still gives good vacium (21.5 in at idle) so all the computer stuff still works. I went with the dual pattern Crane because I intended to stay with the EFI manafolds and I believe the plan is working.I is a tremendous improvement over stock but if you are wanting to go wild don't do it, go with something else. Call Crane and talk to them, they have lots of production grinds that I have never seen mentioned here. Your biggest gains are going to be in head work. I doubt that big 460 body is going to do much or anything unless a lot of work is done to the heads and maybe the runners.
I think if I were doing it again I would have done a lot more to the head. I don't think the .011 left in the hole has made any difference.
I agree, the carb and efi need to be separated. A while back I had a problem and read for two days before asking the question then It p****d somebody off that I didn't read it first. As it turned out the answer he was referring to was not it but it was close.

 

i have the same crane cam and it pulls my 33s hard. im looking to add some hooker headers over the summer with a full exhaust. then im considering the #19 injector swap. i have a spare head i want to have disassembled, cleaned, decked a tab, 3 angle valve job, mild porting and the bowls worked on but thats WAY down the road.

 

One of these days I hope to find a head and work it over to the max. That is what I wanted to do before the rebuild but could not find one. Since this is to be an evening thing whith not particular deadline I wanted to get a set of intakes and EFI exhausts, work on flow then do the ceramic tricks th improve flow and control heat. Polished combustion chamber too. Not hard to do but takes time.

 

all my stuff should be here by mid week, i'll let you guys know how the #19 injectors work on the stock motor, then with the programed chip, then with the other ad-ons so you will know what to expect before you buy them .
i guess i'll be a test dummy since no one will/can give us a streight answer on how well they work and what all is needed

 

Super, really anxious to hear how it works. Let us know part #'s too. Please.
I re set my timing by vacium yesterday. Worked great in town but this morning coming to work I floored it going a little below 70 to pass a car and I noticed a little rattle so I will back it off a hair. With all the slipping dampner problems I am trying to learn the little things about setting it this way. Seems pretty easy so far and the slight rattle tells me I am real close to max. Could have happened with a light too when it's pushed to the max.
Thanks for the note, really looking foward to hearing how it goes.

Richard

 

Well theres a slight delay before i get to test everything... 18x39.5 boogers + posi-traction + heavy foot + hard pack road = very bad things .. saturday we were doing a "before and after" power test and well on the before test we broke an axle SO when all my yukon stuff gets here and i get time to install it i can finish the testing.

 

Thanks for the update. Sorry to hear you are having problems though.

 

Summit part numbers
ACC-150619 #19 Bosch style tip injectors
CRN-6000-6301 Ignition
ACC-TST13 tune up kit

clifford performance/rip-off
53-0016 Headers
93-3031 270 Camshaft kit

Hypertech chip
450821

Exhaust
3" straights no cats or mufflers going into 5" tips

K&N Filter

Truck run like with the bigger injectors before I added the other mods, I did not have to change regulators when all the listed above was put on, and it runs AWESOME now! but keep in mind that my truck NEVER sees the highway so I cannot tell you how they act as a "daily driver", but I can tell you that it does great for off road use.
BUT now I get to tear it BACK down because we bailed off in a pond like hole and sucked water/mud up in the intake oh well, all part of off road fun I guess .

Before the weekend


After

 

Thanks for the update.

Yep, part of the fun. Used to ride dirt bikes and I think I bought at least two a year piece by piece. Had a ball though.

 

That truck is BAD!!

 

No straight answer has been given because those of us who give the straight answers have already given them dozens of times. It gets old after a while. The stock fuel system is good up to about 200 hp. Up to that point the larger injectors provide nothing but improved throttle response. Nobody knows what combination of parts results in needing to improve the fuel system because nobody dynos their truck to gather data. Most hang parts, run it through the gears and proudly proclaim massive power gains with no scientific testing whatsoever. I've lost track of how many dyno pulls I've made with different combinations of parts on the truck, but I've posted the details of everything I've done on this forum. The only info I don't have is a dyno chart on a stock engine. Everything else is pretty well documented.

The plugs will still show lean even with the 19lb injectors if the truck is running right. The pcm determines how much fuel is delivered to the engine; the injectors just determine how much is available. With larger injectors you are basically tricking the pcm into providing more fuel at WOT when it's in open loop and doesn't know the difference.

BBC rockers don't work on the EFI engines. There are other rockers out there that might work. I've got a set from a 3.8 v6 ready to go on, but haven't had time to do the swap and all the associated testing needed to quantify any gains if there are any.

Right after the original "Need more power again and again" started I asked for a separate thread for the EFI engines. I still think it's needed, but apparently others don't.

 

Oops, almost forgot. Setting timing by ear is not a good way to do it. Just because you can add timing without causing preignition doesn't mean the engine want or needs the extra timing. My truck doesn't start to ping until the initial advance is at 27 degrees. Best power is made about 14-16 degrees.

 

i agree, we need an EFI and carb'd thread seperate. sicne theres no mod for this forum i guess it'll never happen.