67 Satellite 383 refresh - questions/advice

[BSB67]

The 2315 has a CH of 1.92”. That piston will be about 0.015” - 0.018” below the deck in an in cut block.

You can plan your machining, gasket and head choices from there.

 

[BSB67]

…….and found all of the exhaust valves were very tight in their guides while all the intakes dropped right out. The only exhaust valves that came out with minimal effort were #2 and #4. The rest will not come out without either using a puller from the valve side or drift from the stem side…….

Were they tight in the range of normal operating travel, or just during removal?

Always take a flat file and clean-up the valve where the keepers sit and on the top edge of the valve.

 

[copper67sat]

My build is in paint jail at present. Self imposed, because I fired the guy that did much of the work, and am having trouble finding a competent person to finish up.

I was wondering why you hadn't been updating that thread. It's a good resource for what my engine should have had.

From what you indicated, you have some 915’s that would fill the bill. Your #1 problem is the pistons and you are going in the right direction there.

I am still on the fence here. The ported 915s I have look pretty rough. I don't remember where I got them, but know I didn't pay much, if anything, for them. Looking closer, I don’t think it was a professional job. The other pair came from another '67 383 I have and look untouched. I did a quick cc on one chamber and came up with 80cc, same as my current 516s. Both 915s have small valves and what I think are original, non-hardened exhaust seats.

My current thinking is that I can get a better flowing set of aluminum Stealth heads for about the same $ as it will cost to fix up any of my iron heads. Plus, I need to find a competent machine shop around here to do the work. I don't trust either of the 2 closest ones and I don't have any strong referrals yet since most of my Mopar buddies have moved away.

 

[copper67sat]

Were they tight in the range of normal operating travel, or just during removal?

Always take a flat file and clean-up the valve where the keepers sit and on the top edge of the valve.

They are all snug compared to the intakes which dropped right out. Some will come out with minimal effort after cleaning up the lock grooves. 3 & 6 are tight within the normal operating range and the guides are moving in the head more than the valve is moving in the guide - I haven't seen 6 move in the guide at all.

I just set them in the corner and walked away after seeing that.

 

[copper67sat]

The 2315 has a CH of 1.92”. That piston will be about 0.015” - 0.018” below the deck in an in cut block.

That matches my calcs assuming the current pistons are Silv-O-Lite 1271s with a 1.848" CH. The block was not cut during the original rebuild, but may need skim cut now - need to check that.

With 80cc heads, Cometic C5460-027 gaskets (if I go with the Stealth heads) and 2315s. I calculated something like 9.8 CR. Accounting for the fire ring volume dropped that a bit.

EDIT: Rechecked my calcs. I was double-bookeeping the gasket compressed volume because Cometic provides that spec whereas I was calculating it for other options. Updated the calc and CR would be 9.8 with the setup above. Can always go lower CR with a thicker gasket, but I was trying to see how high I can get it without doing a lot of machining.

 

[Jerry Hall]

I was wondering why you hadn't been updating that thread. It's a good resource for what my engine should have had.



I am still on the fence here. The ported 915s I have look pretty rough. I don't remember where I got them, but know I didn't pay much, if anything, for them. Looking closer, I don’t think it was a professional job. The other pair came from another '67 383 I have and look untouched. I did a quick cc on one chamber and came up with 80cc, same as my current 516s. Both 915s have small valves and what I think are original, non-hardened exhaust seats.

My current thinking is that I can get a better flowing set of aluminum Stealth heads for about the same $ as it will cost to fix up any of my iron heads. Plus, I need to find a competent machine shop around here to do the work. I don't trust either of the 2 closest ones and I don't have any strong referrals yet since most of my Mopar buddies have moved away.

I have $760 in the 516 original heads. That's new valves, 1.74 and hardened exhaust seats, and the total valve job. Hope this helps.

 

[copper67sat]

I have $760 in the 516 original heads. That's new valves, 1.74 and hardened exhaust seats, and the total valve job. Hope this helps.

I think I spent about that much on the current 516s in 1990 - hardened seats, 3-angle valve job, bronze guides, milled surface, new valves. Head work and parts were about half of the overall machine shop cost. South FL shop rates are probably higher than AL, but sounds like you got a good deal to me.

 

[Jerry Hall]

I think I spent about that much on the current 516s in 1990 - hardened seats, 3-angle valve job, bronze guides, milled surface, new valves. Head work and parts were about half of the overall machine shop cost. South FL shop rates are probably higher than AL, but sounds like you got a good deal to me.

When you go to larger valves, you get some port work without asking, because they have to blend the cuts into the ports.

 

[copper67sat]

When you go to larger valves, you get some port work without asking, because they have to blend the cuts into the ports.

Jerry, did you mill your heads and/or CC them? Curious where you think the CR is.

 

[Jerry Hall]

Jerry, did you mill your heads and/or CC them? Curious where you think the CR is.

No to both, but my guess is somewhere between 9.5 and 9.8. With all original components to the engine, I think it's as good as it left the factory in 67. I used steel shim head gaskets just as it left the factory with.

 

[dvw]

This is the classic how much performance do you want vs how much budget. If it's tight? I'd check the bearings and replace if needed. Thats as far as I'd go with the short block. The only reasonable gains in power in the short block are compression or a longer crank. Both are costly. Milling won't be worth the cost and hassle of what the gain would be. So what does that leave? Cam appears in good shape. It's also a very good cam for light performance use. With low compression you can't add much more cam. Shim head gaskets are a no cost compression boost. So that leaves heads. Depends on machining costs. Could be a toss up with aluminum heads. The closed chamber iron head will have more compression but the ports, chamber design, and plug location aren't great. The aliminum head would like more compression but the short block is what it is. I'd do what ever was the most cost effective. It's a driver 383 with a 3.23 gear and A/C. Don't try to make it what it's not. Repair whats broke and enjoy it.
Doug

 

[BSB67]

This is the classic how much performance do you want vs how much budget. If it's tight? I'd check the bearings and replace if needed. Thats as far as I'd go with the short block. The only reasonable gains in power in the short block are compression or a longer crank. Both are costly. Milling won't be worth the cost and hassle of what the gain would be. So what does that leave? Cam appears in good shape. It's also a very good cam for light performance use. With low compression you can't add much more cam. Shim head gaskets are a no cost compression boost. So that leaves heads. Depends on machining costs. Could be a toss up with aluminum heads. The closed chamber iron head will have more compression but the ports, chamber design, and plug location aren't great. The aliminum head would like more compression but the short block is what it is. I'd do what ever was the most cost effective. It's a driver 383 with a 3.23 gear and A/C. Don't try to make it what it's not. Repair whats broke and enjoy it.
Doug

This.

 

[copper67sat]

I'd do what ever was the most cost effective. It's a driver 383 with a 3.23 gear and A/C. Don't try to make it what it's not. Repair whats broke and enjoy it.
Doug

Thanks Doug. I generally agree with what you posted and value your input as well as everyone else who has chimed in. The car is definitely more of a cruiser than a bruiser, but I don't mind throwing in some performance-minded upgrades if they make sense and increase the fun factor. That said, I am also mindful of the cost spiral. I'm not on a strict budget, but I want to get good bang for my buck and not spend on unnecessary or unwise changes.

My first priority is addressing the heads since they need obvious work. After that, I may still consider options to get the compression ratio back closer to the ~10:1 it left the factory with though the current pistons seem to be the limiting factor there.

I don't think I want to throw any more $ into the current 516s so I'm currently torn between fixing up the stock, non-hp 915s I have or going with 440 Source Stealth aluminum heads. Decision really hinges on finding a local-ish machine shop I trust to install hardened 1.74 seats, do a good valve job and guides if needed and how much all that costs. I'm somewhat inclined to go with the Stealths if the costs are comparable though I know that's heading into the spiral. Both have closed chambers around 80cc's so they won't change the CR. The Stealths should flow better, but I don't know if the rest of my setup can really take advantage of that.

Going back to a steel shim head gasket would add a couple tenths of CR. May be better than nothing, but still leaves it at about 8.5. I've only found 1 option for those online so far - Mr Gasket - and the reviews weren't great. Open to recommendations.

Seems like changing pistons would be the best way to add another point or more of CR. Cost of pistons and rebalancing aren't too bad. Question is whether it's worth it for what may only be a 10-15 hp gain. Choice of iron v. aluminum heads probably factors in here.

That's where my thinking is today. Still more to do before I commit $ to any of these options. Hoping to tear down the short block this weekend to see if anything there needs attention. That may change my priorities.

 

[dvw]

Thanks Doug. I generally agree with what you posted and value your input as well as everyone else who has chimed in. The car is definitely more of a cruiser than a bruiser, but I don't mind throwing in some performance-minded upgrades if they make sense and increase the fun factor. That said, I am also mindful of the cost spiral. I'm not on a strict budget, but I want to get good bang for my buck and not spend on unnecessary or unwise changes.

My first priority is addressing the heads since they need obvious work. After that, I may still consider options to get the compression ratio back closer to the ~10:1 it left the factory with though the current pistons seem to be the limiting factor there.

I don't think I want to throw any more $ into the current 516s so I'm currently torn between fixing up the stock, non-hp 915s I have or going with 440 Source Stealth aluminum heads. Decision really hinges on finding a local-ish machine shop I trust to install hardened 1.74 seats, do a good valve job and guides if needed and how much all that costs. I'm somewhat inclined to go with the Stealths if the costs are comparable though I know that's heading into the spiral. Both have closed chambers around 80cc's so they won't change the CR. The Stealths should flow better, but I don't know if the rest of my setup can really take advantage of that.

Going back to a steel shim head gasket would add a couple tenths of CR. May be better than nothing, but still leaves it at about 8.5. I've only found 1 option for those online so far - Mr Gasket - and the reviews weren't great. Open to recommendations.

Seems like changing pistons would be the best way to add another point or more of CR. Cost of pistons and rebalancing aren't too bad. Question is whether it's worth it for what may only be a 10-15 hp gain. Choice of iron v. aluminum heads probably factors in here.

That's where my thinking is today. Still more to do before I commit $ to any of these options. Hoping to tear down the short block this weekend to see if anything there needs attention. That may change my priorities.

I'd port the aluminum heads before spending $ on a compression increase. Power per dollar will be better. For what it's worth. I have a 73 Challenger that was built for my wife. 360, ported factory heads, LD340 dual plane, 650 Holley, 220/230 cam, headers, true 9.0-1, 3.55 gear. Runs on 87 octane. It has run 12.7@107 in full street trim. Compression is nice but it's not the end of the world.
Doug