1979 GMC Dually TBI swap

[ony]

your wiring hornass don't have a spark control module plug ?

[Randy 79]

No it doesn't, ESC is in the ECM on the 7060. The 8747 doesn't have KS or ESC, so at least I shouldn't have any issues with that, hopefully (knocks on fake wood).

[Nasty-Z]

I would personally repin your harness and use the '7427 PCM , run it with your manual trans now and have the capability there for an '80E if you choose down the road .

Also, try if at all possible to run the knock sensor and system , especially if it will see towing / hauling duty , don't know why GM didn't use it on some , kinda weird.....

I would simply wire in the DRAC now , it is needeed for E trans control (as I have found out) and is much easie4r to add it now and not need it than to need it and not have it.

That cam , as Mark said , will be a dog without boost . If you are replacing it , I would go roller and not look back . Cant see the timing cover in the pic but you can either check that or the lifter valley , some very late GenV's were drilled and tapped for the roller lifter retainer , this was at the point they were getting ready to release the GenVI , timing cover would have 6 bolts and be either composite or aluminum. Might get lucky ......

The injectors will support a fair amount of boost (ask me how I know) , but be warned the 3764 intake will be the restriction , might want to think about a good single plane if you force feed it in the future. Bit high on the F/P that he was running if it was N/A but a slight correction and you should be good to go.

Also , you can loose the 45 degree oil filter adapter if you want to in your picture , you won't need it and it will make header / manifold fittment easier. Engine was out of a 4X4 I assume ?

Nice truck , wish I would have kept my '79 crew cab Dually , my plan was exactally like yours , TBI BBC / 4L80E , all with a '7427 to control it. Oh , and a blower

TOM

[Randy 79]

If you can use the 7427 with a m/t, shouldn't you be able to do that with the 7060 as well? Just wondering. KS would be nice to keep but not a necessity for me.

As for the trans, this truck will stay m/t, pretty much decided against the 4L80E. I want to get a 4-door truck down the road, just not enough room in the standard cab. So I won't need the DRAC on this truck but I do have it just in case.

As for the cam, PO said it wasn't a dog and matched up well with the 96 Vortec 454 Suburban he replaced it with. The cam is worn so I will be changing it anyways. Block is a 92 and no provisions for roller cam, plain steel timing cover. Just going with flat tappet for now due to costs.

No boost plans, just having fun. The adapter is already off the block (motor was in a 4x4 Suburban).

[ony]

I would pick egale marks brain before I started buying stuff, I worked on a hot rod 454 some one changed from a 350 my scanner kept asking for a esc module there was no wires for that sensor or a knock sensor, I sent him to a hotrod shop I put a 8747 an a 7747 with a good bin file in it, still wanted esc an knock sensor. I don't know if they got it fixed or not, I think it needed a wiring hornass out of a 1990 454- std trans.

[Nasty-Z]

Sounds like you have it well in hand then.

Good luck with the project.

TOM

[EagleMark]

A lot of BB did not come with knock sensor in 7747 but they can be added and bin straightened out.

Swapping to 97427 is same as what you have, no manual bins to start. We've done 97427 with a $0E manual bin and found it's easier and better runner with a $0D auto bin. So I'm going to retract what I first said about a possible ECM swap. Why go to a slower ECM, add wiring for ESC and knock?

That boost cam has backwards split duration steps for boost, can't see it doing anything but hurting performance without boost...

[Randy 79]

Tom, I wish I had it well in hand, I have been confusing myself as much as I am figuring stuff out. I appreciate the help and info I am getting here.

So Mark, are you saying that the 7060 can be used? If I can use it, that's good news.

I will be going with something different than the turbo cam, just to be on the safe side. Are the Comp TBI cams a good choice or is there better choices? Trying to stick with flat tappet to keep costs down. The PO did convert it to adjustable valvetrain thankfully. As for how the turbo cam worked, all info is what the PO told me, I never got to see it run, engine was out of the vehicle already.