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hi-perf heads?

k20

k20

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Had a guy a couple weeks ago telling me how on the 6.2's there is a casting number that has higher performance than regular 6.2 heads, said it was something to do with the injector angle, blah blah blah. Didnt pay him much attention cause I figured he was talking out his ass, but now that I got these 4 extra 6.2's sitting here I wish I could remember what number it was he said, just to see if I have a set sittin here.
 
I think there might be a Marine head. but honestly I'm not sure
 
Just asked my GM diesel guru and he said

"As far as heads go, there are only stock one available but porting and polishing elps with the flow pretty well. Someone told me there is a place in Montana that has custom ground cams for 6.5's. If you're gonna build a 6.5, you'll need headstuds, stud girdles, head inserts, dual-idler gear drive, a high volume oil pump, and a high flow water pump and t-stat."
 
yeh this guy was saying something it was just a diff casting number stock head that had a higher performance to it. I figured he was on crack anyway.

But as an aside (so I dont have to start yet another retarded thread), I checked casting numbers on the 4 engines I got, all 4 are 14022660 casting numbers, but one has 10 29 81 below the 14022660. Could this be the casting date for the block and would this make it a 'red block'? These things have all been cleaned and repainted black so I dont know what the original color paint was.
 
I dunno man I dont know that much about them I'm new to the 6.2 performance game
before if a 6.2/6.5 ran I left them alone lol
 
Humvee and P-Vans with turbos had different angle intake ports iirc. But there is no real difference in the performance of them over the regular style heads.

The Precups in the heads (Which are removable and interchangeable) are where the different power levels come into play. C-and J Code motors had different pre-cups with the J-Code Precups being more desireable Because they do allow for more power output. If these are military surplus motors then you should have what amounts to the "J-Code" precups in the heads. If you are going to stay NA then these are about the best Pre-cups to run, If you are going to turbo it eventually then they make a special pre-cup for the turbos to allow more power output. Running these in a NA motor wont help you however.
 
You know 5 years ago you couldn't give me a 6.2 and know I seem to be buying up everyone I can lol I really like these little engines!!
 
Yep. Diesel is viewed in a new light since gas went over 2 bucks a gallon.

Same way with a lot of things like 4-cyl 4x4's and small 4x4's.
 
eh, you'd still never get me In a yota our a jeep . not that there not neat little rigs but they just dont fit my lifestyle lol


oops I think we kinda Hi-jacked the thread sorry!!
 
Eh, seems like the point of the thread was finished anyways.

I just sold my 2 door Geo Tracker on 31's because it was too small to haul my two dogs around and didn't do distances well. The K5 does all of that better.

Now back to diesel talk.
 
I wonder if a Pump from a 7.3 litre Ford would work its the same type of standyne pump but in therory it should flow more ???
 
the 7.3 pumps are mirror images of the 6.2 pumps. Already thought about it, because I had a 7.3 and a 6.2 sitting side-by-side on the ground.

You can get more fuel out of a DB2 than you can get air into a 6.2 without a turbo, with a turbo you can blow things up long before the db2 isn't capable of delivering enough fuel
 
a db4 however, from what i understand will bolt in and offers much higher injection pressures, which should aid in combustion.

oh and to the issues of the heads, didnt the 6.2 heads have bigger ports and valves than the 6.5 heads? i know if youre building a performance 6.5 you want the 6.2 heads to put on it.
 
from everything I've read or heard in the last few days there is no gain to be had from swapping STOCK UN-Modded heads around . the only real gains come from port and changing out pre-chambers.
 
K5dreamer said:
oh and to the issues of the heads, didnt the 6.2 heads have bigger ports and valves than the 6.5 heads? i know if youre building a performance 6.5 you want the 6.2 heads to put on it.
Click to expand...

IIRC The early pre-85 6.2's had bigger exhaust valves? They ended up changing them to smaller valves due to problems with the heads cracking, Im shootin from the hip on this one.
 
k20 said:
But as an aside (so I dont have to start yet another retarded thread), I checked casting numbers on the 4 engines I got, all 4 are 14022660 casting numbers, but one has 10 29 81 below the 14022660. Could this be the casting date for the block and would this make it a 'red block'? These things have all been cleaned and repainted black so I dont know what the original color paint was.
Click to expand...
1982 blocks do not have a "date code" but a "date". So you have one of the most desired 6.2 blocks! If the engine still has its original heads, injectors should be coarse threaded.

fallout232 said:
IIRC The early pre-85 6.2's had bigger exhaust valves? They ended up changing them to smaller valves due to problems with the heads cracking, Im shootin from the hip on this one.
Click to expand...

x2

Walter
 
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