Ready to pick a cam

[lunatic]

Hi gang.

I'm ready to pick a cam.


Here is what I have:
440
Stock stroke
.030 dome pistons
Stock, large chamber iron heads
Static CR coming in around 10.5:1
Single plane intake
Throttle body efi setup with timing control.
Headers
4 speed

What I'd like:
Happy cruising manners, (no need for high rpm)
Able to run pump gas (ideally 87)
Enough vacuum for the disc brakes.
Some lopey sounds


I know I can use cam selection to bleed off compression and accomplish that pump gas goal, but beyond that my knowledge of cam stuff is very limited.

 

[493 Mike]

Why not call a cam manufacturer?
Mike

 

[BSB67]

IMO, you can't get there from here.

What piston is it? Did you actually measure everything to determine the compression ratio?

 

[sam dupont]

I would use factory Magnum numbers cam and a dual plane for happy cruising and occasional fun

 

[lunatic]

IMO, you can't get there from here.

What piston is it? Did you actually measure everything to determine the compression ratio?

it was a NOS set that came with the block.
My machine guy thinks they're L2295F's (or 7025P), and we're ballparking by the chart for the cc's. He's still working on cleaning up the heads. I did a little look for alum heads but doesn't appear anyone makes them big enough to get me anywhere near pump gas land.

 

[BSB67]

The 2295 will not be 0.030” dome, unless someone milled the dome down. The part number should be on the piston. The 2295 has a 2.030” compression height. If it’s a 2295 milled down to 0.030”, the CR will be less than 10:1, and maybe close to 9:1 depending on head volume, deck height and gasket thickness.

if you are looking to run 87 octane near sea level, you need to be below 9:1, IMO.

 

[RemCharger]

I read it as a .030  over domed piston.

 

[BSB67]

I read it as a .030  over domed piston.

Ahhh, yes

 

[RemCharger]

My buddies running a 2295 440 with edelbrock rpms.. it's not optimal for the street. Needs a good fuel mixture

 

[gtxrt]

it was a NOS set that came with the block.
My machine guy thinks they're L2295F's (or 7025P), and we're ballparking by the chart for the cc's. He's still working on cleaning up the heads. I did a little look for alum heads but doesn't appear anyone makes them big enough to get me anywhere near pump gas land.

they have a 84 cc Edelbrock alum head. that would be like having 9.5 compression with an iron head. those old heavy speed pro pistons with the thicker rings costing HP plus they never give you the right compression ratio are not worth the money even at a cheap price. they should be outlawed for us Mopar guys lol.

 

[lunatic]

they have a 84 cc Edelbrock alum head. that would be like having 9.5 compression with an iron head. those old heavy speed pro pistons with the thicker rings costing HP plus they never give you the right compression ratio are not worth the money even at a cheap price. they should be outlawed for us Mopar guys lol.

eh. i'm trying to work with what i've got. if it turns out i can't make it work, then i guess i'll try something else. but i'd rather not drop $2k on heads for a car that is just a roof and doors at this stage. if i have to i will, but i'm gonna complain the whole time.
https://y.yarn.co/a28e7277-c394-4b7c-ad98-5ca9bb450238_text.gif

 

[PRHeads]

It’s a pretty straightforward build, with reasonable requirements…….. other than the 87 octane fuel.

My suggestion is get a cam that satisfies the other requirements, and understand it’s not likely going to be happy at WOT on anything less than 93.

 

[lewtot184]

You'll never do 87 octane with anything around 9:1 or higher; especially with an iron open chamber heads. I don't think 89 octane will support a quench dome piston at 9:3. Been thru all this before. What you want won't work.

 

[lunatic]

It’s a pretty straightforward build, with reasonable requirements…….. other than the 87 octane fuel.

My suggestion is get a cam that satisfies the other requirements, and understand it’s not likely going to be happy at WOT on anything less than 93.

thank you for telling me where i need to compromise

 

[BSB67]

I doubt 93 octane will help much. I’ve done two similar builds to what you’ve got. One was 10.3:1. I could not accelerate at a moderate rate without serious detonation.

Call PRheads for a cam recommendation. Mine would be something like the MP 509 cam with the 114 LSA, simply in an attempt to make what you have work

 

[gtxrt]

you're supposed to build your engine around the cam that you want to use not the other way around. I would almost change the pistons but I bet the bore is too big now because of the piston clearance you need to run with the speed pro- pistons. not picking on you but trying to help new guys with their first engines.

 

[BSB67]

Swapping the 2295 for the 2266 is not a bad idea.

 

[PRHeads]

Personally, I’d mill the domes off the 2295’s before I ran 2266’s.
There isn’t going to be any type of quench anyway, so just run thicker head gaskets if needed to dial in the CR.

2295’s in an uncut block will be around .045” down the hole, plus they’d still have the valve trough(let’s call that 2cc)

446 using 2295’s w/dome milled off:
914 swept
86 chambers
2 valve pockets
11 deck
11 gasket
1 ring down crevice
————
1025 total
111 total minus swept
—————
9.23cr (1025/111)

 

[gtxrt]

I’d mill the domes off the 2295’s

I'm not sure you can mill the dome off all the way but you can take some of it off. have to check how thick the dome is It can't be solid.i don't think a .050 head gasket would hurt anything if the intake will fit right. if you can get the dome down to 6cc with a .050 gasket you would be at about 9.7-9.8 compression something you can live with 93 octane, the right cam and with a conservative distributor advance curve.

 

[BSB67]

The reason for 2266 is you can match the reciprocating weight easy enough. The 2295 already has a heavier pin in it. Cut the dome off will likely need a rebalance.

This seems like the lowest cost, and P/V shouldn’t be a problem