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Old 11-13-2021, 12:27 AM   #26
cwcarpenter98
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Re: 283 Cylinder Head Decision

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Originally Posted by geezer#99 View Post
Your plugs won’t know the difference between points and hei.
Justgap the new ones to .045 for the hei.
Sweet, thank you
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1963 C10 - Frankentruck 283, 3 speed with overdrive
Overdrive wiring here
1963-ish truck bed trailer - Half-Wit

1981 C10 - Penny 305, th350

1995 Dodge Dakota Sport

"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
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Old 11-13-2021, 08:57 AM   #27
Dead Parrot
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Re: 283 Cylinder Head Decision

Be sure to give those plug seats on the head a good cleaning before installing your new plugs. Otherwise you might not get a good seal. They likely have a few years accumulation of crud since you were running the newer taper plugs.

IMO - your compression numbers look good. What you don't want to see is 7 cylinders at one number and the 8th way off.
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Old 11-19-2021, 07:13 PM   #28
AussieinNC
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Re: 283 Cylinder Head Decision

Before you buy new plugs, clean up the plug seat area in the head and post a pic of the plug hole....

Also post a pic of the front of the head showing the casting pattern...someone may have put taper seat heads on this good old boy....

140 average and a 4% variance which is pretty good for this good old boy

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Last edited by AussieinNC; 11-20-2021 at 04:43 PM.
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Old 11-19-2021, 09:54 PM   #29
cwcarpenter98
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Re: 283 Cylinder Head Decision

Ok, here's two pictures from when I first put the engine in 3 years ago. The heads have no bolt holes for accessories. They have a rectangle at the front.
The second picture shows the number one spark plug hole. My thoughts to run the tapered plug came from the beveled edge leading to the threads.

I've only done plugs on this truck, my Dakota, and my dad's 02 Silverado.

The heads on my other 283 that I pulled out have no accessory holes and have the single triangle on top of the rectangle (3rd picture)


AussieinNC,
On the sheet where I wrote down my numbers, I wasn't real clear on the spread. I had a difference in PSI between high and low of 10 PSI. I had about a 4% difference from the average in PSI at the highest and lowest numbers.


Dead Parrot,
Thank you for the tip! I was glad to see that there was not a cylinder completely out of line compared to the others
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Christian Carpenter

1963 C10 - Frankentruck 283, 3 speed with overdrive
Overdrive wiring here
1963-ish truck bed trailer - Half-Wit

1981 C10 - Penny 305, th350

1995 Dodge Dakota Sport

"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
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Old 11-20-2021, 04:42 PM   #30
AussieinNC
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Re: 283 Cylinder Head Decision

The heads on the smoky engine appear to be 460 castings...8:1 compression, 1.72 / 1.50 valves....

The heads on the other engine are known as power pak heads....9.25 compression, 1.72 / 1.50 valves.....59 cc chambers...57-60 fuel injection heads....better heads but no accessory holes....

Assuming they are not cracked or corroded, these would be better heads to refurb on a rebuild.

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Old 11-21-2021, 07:04 PM   #31
cwcarpenter98
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Re: 283 Cylinder Head Decision

Quote:
Originally Posted by AussieinNC View Post
The heads on the smoky engine appear to be 460 castings...8:1 compression, 1.72 / 1.50 valves....

The heads on the other engine are known as power pak heads....9.25 compression, 1.72 / 1.50 valves.....59 cc chambers...57-60 fuel injection heads....better heads but no accessory holes....

Assuming they are not cracked or corroded, these would be better heads to refurb on a rebuild.

The ones on the engine now are 3814480 castings. Mortec says this: "3814480....60-67...283/327..70cc chambers, 1.72/1.5 valves". I don't have a picture of the casting numbers on my power pak heads, so I don't have those numbers readily available.

Most likely, I'll be replacing the valve seals with the engine still in the truck over Christmas break. Most economical and least time consuming at the moment
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Christian Carpenter

1963 C10 - Frankentruck 283, 3 speed with overdrive
Overdrive wiring here
1963-ish truck bed trailer - Half-Wit

1981 C10 - Penny 305, th350

1995 Dodge Dakota Sport

"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
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Old 11-24-2021, 09:22 PM   #32
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Re: 283 Cylinder Head Decision

Now that I'm back home for Thanksgiving, I checked the numbers on the other heads. They are 3884520 heads
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Christian Carpenter

1963 C10 - Frankentruck 283, 3 speed with overdrive
Overdrive wiring here
1963-ish truck bed trailer - Half-Wit

1981 C10 - Penny 305, th350

1995 Dodge Dakota Sport

"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
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Old 11-27-2021, 09:29 PM   #33
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Re: 283 Cylinder Head Decision

I got the correct plugs swapped in yesterday. Seems to be running a tad better now.
Haven't dealt with the valve seals yet, but since I'm headed back to Milly tomorrow with Frankentruck, I didn't want to start something and not be able to finish it
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Christian Carpenter

1963 C10 - Frankentruck 283, 3 speed with overdrive
Overdrive wiring here
1963-ish truck bed trailer - Half-Wit

1981 C10 - Penny 305, th350

1995 Dodge Dakota Sport

"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
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