273 302 318 340 build

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Thanks Lelo. I did measure all 4 chambers. They all were close enuf with my redneck measuring. Call them all 0.080".
For pistons I only measured #1 and #3. Both measured with dial indicator (redneck style). Both stuck out close enuf to call them 0.034" out.
Plugging in these values with a hg thickness of 0.038"
0.038-0.034+0.080=0.084"
If my math is correct.
That link you posted is a good read, thanks.
UEM has pretty cool stuff/calculators on their site.
Doing some reading, I revived an old "quench" thread and have found some good info.
Frustrating as to why optimal quench wasn't designed into the 340 to begin with? The benefits were known way back then.
Is it fuel related?
Link
Quench Vs Piston To Head Clearance
 
4spdragtop said:
Thanks Lelo. I did measure all 4 chambers. They all were close enuf with my redneck measuring. Call them all 0.080".
For pistons I only measured #1 and #3. Both measured with dial indicator (redneck style). Both stuck out close enuf to call them 0.034" out.
Plugging in these values with a hg thickness of 0.038"
0.038-0.034+0.080=0.084"
If my math is correct.
That link you posted is a good read, thanks.
UEM has pretty cool stuff/calculators on their site.
Doing some reading, I revived an old "quench" thread and have found some good info.
Frustrating as to why optimal quench wasn't designed into the 340 to begin with? The benefits were known way back
4spdragtop said:
Thanks Lelo. I did measure all 4 chambers. They all were close enuf with my redneck measuring. Call them all 0.080".
For pistons I only measured #1 and #3. Both measured with dial indicator (redneck style). Both stuck out close enuf to call them 0.034" out.
Plugging in these values with a hg thickness of 0.038"
0.038-0.034+0.080=0.084"
If my math is correct.
That link you posted is a good read, thanks.
UEM has pretty cool stuff/calculators on their site.
Doing some reading, I revived an old "quench" thread and have found some good info.
Frustrating as to why optimal quench wasn't designed into the 340 to begin with? The benefits were known way back then.
Is it fuel related?
Link
Quench Vs Piston To Head Clearance
Click to expand...
Steve... emissions related ,cheapo way out. Revealed ,quenching therory,s was known 10p years[,ago Check out " Ricard5's theyoy , of combustion...:)/QUOTE]
Click to expand...
 
Ok so ordered head gaskets MP# P4349557. After searching FABO I found out these are actually a pair of Felpro 1008. (No specs on bore or comp thickness)Ordered thru the Dodge store for $68.
Also ordered MP reusable OP gasket. Around $12.
MP oil pump spring kit $6.
MP hardened dist drive and gear $75.
Pretty cheap bill from Dodge really.
Intake gaskets Felpro 1213 I had on the shelf. Bought factory adjustable rocker gear from a great member here, so once that arrives I'll give it a look see and possibly do the Crane mod with adjusters and locknuts.
Still need to get new oil pump as well as new head bolts.
 
More goodies n trinkets. Adjustable rockers from Jake aka xLURKxDOGx . Thanks again Jake!! The rest from the Dodge store. Gotta get off my arse and get this put together.
Mic'd the Felpro 1008's, 0.043"
Pick up the oil pump this week.
Cheers
Steve

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Almost a year since posting here. Some progress porting the X heads. All so far mostly has been carbide burr. I need to use the abrasive rolls yet for final sanding. I'm starting to learn the terminology after reading lots and watching a lot of YouTube. I'm surprised there isnt more videos/how to's on the X heads.
Cylinders 2/4/6/8.
I tried to focus on the guide boss and guide boss tail. I also did short side radius on the floor which (see 2nd last pic with burr in pic, intake #4) is where I tried to smooth/blend out the transition to valve seat.
Last pic with green pencil intake #2 is where I focused on minimizing the bump on the tail. Main focus was on the tail turn into the flow path, but tried to minimize tail everywhere.
Advice/pointers?
Thanks
Steve

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Old eyes here but that bottom cut looks pretty wide
45 and 60 about the same width then go from there
what's your cut's and widths?
 
When you say bottom cut do you mean the pocket area either side of guide boss? Burr is almond shaped, 3/8" wide.
When you say "45 and 60" are you referring to angles? Sorry not understanding
Thanks
Steve
Wyrmrider said:
Old eyes here but that bottom cut looks pretty wide
45 and 60 about the same width then go from there
what's your cut's and widths?
Click to expand...
 
No pitting, just dirty. I wiped it for this pic. Maybe there is something I dont see??
The valves will be lapped before final assembly. I had no leaks when combustion chambers were cc'd.
Jadaharabi said:
Looks like you have a rust pitting problem on the seats.
Click to expand...

20190401_153910.jpg
 
what I'm not seeing is a couple of more bottom cuts
forget lapping the valves if they seal
valves expand when hot then your lapped seat is in the wrong place
 
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