73-87 Chevy _ GMC Trucks > Projects Posts (NOT VEHICLES)

350 Engine build for 84 k10

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TB24:
I’ve had the 84 k10 for over a year now, the truck came with a 305 and sm465 from the factory but along the way somewhere, someone put the built 350 that is currently in it now in. I have decoded the block and heads in it and found that it is an 82 350 that originally came out of a van or bus. I also found the heads are the (from what I’ve found) bad 624 casting number.

Jumping ahead to current days, I’ve been driving it pretty rarely due to the drivability of it. It has a manual choke that isn’t very operable, and low end torque is pretty nonexistent (which makes it a little tough on the sm465 imo) but I still loved driving it lol. Unfortunately, I don’t know exactly what all modifications have been done I will attach a picture of the only info I have. I know it has a crane cam with “51” lift. I’m not sure exactly what that means. .510 lift? .451 lift? I thought one of you be more in tune with that nomenclature.

I’ve been waiting to tear into it until our garage was built, a couple weeks ago it was finished so I’m excited about that. The other day I was driving it and something very weird happened, the clutch adjustment rod went through the clutch fork. Extremely weird to me and my dad hasn’t seen it either. Here is a picture of that.


I took that as a sign to shut it down and get started. All that I know about the clutch is that it is a zoom clutch and I guess it is pretty heavy duty and caused the adjustment rod to do that?


Here is all the info I have on the engine. I can tell when looking at the suffix code that the block has been decked, hopefully not too much for my purposes.

The plan is to make it a reliable daily driver that will probably never see anything over 3500rpm, I am 99% sure I will be building around the 12-300-4 comp cam.


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bd:


It's really not all that surprising.  That's caused by decades of use with insufficient lubrication of the rod end and its ball socket.  You may discover similar wear at the clutch fork pivot ball.

TB24:
Thanks BD, that makes sense. How would you go about lubricating that specific area?


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bd:
Apply a dab of extreme pressure moly-sulfide bearing grease every service.

TB24:
I have a few cams I’d like to hear your opinion on. All flat Tappet:
 

Howard’s 117071-12
Advertised duration: 256 intake 262 exhaust
@ .050: 194 intake 203 exhaust
Lift w 1.5 rockers: 0.390 intake 0.410 exhaust
112 lsa
 


Crower mileage compu pro 00238
Advertised: 250/258
@ .050: 192/196
Lift w 1.5 rockers: 0.392/0.399
112 lsa
 


Crower mileage beast 00902
Advertised: 246/252
@ .050: 192/198
Lift w 1.5 rockers: 0.393/0.402
112 lsa
 


Melling 22111
Advertised: 270/278
@ .050: 194/204
Lift w 1.5 rockers: 0.399/0.422
112 lsa
 

Summit 1101 -same as melling 22111 (except 1/1000 of lift)
 

Lunati 06101
Advertised: 262/262
@ .050: 201/201
Lift w 1.5 rockers: 0.393/0.393
112 lsa
 

I am getting a little scared of the quick ramps of the comp mentioned above simply for longevity reasons. A lot I know I’m sorry but they are all pretty similar I just don’t really know the reputation of the brands much and looking for some feedback. The lunati says rpm range 1,000-4,800 so a little higher than the other ones right off idle. I also lean towards longer exhaust duration if I understand correctly that would help.


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