516 heads

Posted By: zzyzxpat

516 heads - 12/23/09 12:40 AM

I am putting together an original 361, and want to keep it all original. I know that 440s,383s are a better way to go per dollar spent, but I am a little different sometimes. The heads have had 1.74 exhaust valves installed and all new valves. I am going to run a Lunati 60304, .513-.533. The proper springs are there. My question would be on porting. I am going to do it myself and am asking for advise from those who have knowledge in this area. Please don't tell me to change to a different head. This 361 will be stroked to 450 but look completely stock and is going in a numbers car. Thanks in advance.

Posted By: mopar65

Re: 516 heads - 12/23/09 01:31 AM

I would pm fast68 on the board here. here is a write up he did on the 516-V-906 head.Very good write up

Mopar65

Posted By: camdog440

Re: 516 heads - 12/23/09 03:05 AM

Check out the Tech Archive .

Posted By: StealthWedge67

Re: 516 heads - 12/23/09 03:36 AM

Get the MP templates and have at it.

Posted By: sixpakdodge

Re: 516 heads - 12/23/09 03:39 AM

Sonic check them first.

A friend decided to take the cheap way out and port a couple of these for his NSS car. He ground them thin and cracked not one pair, not two pair, but at least three that he has admitted to.

He runs Max Wedge heads now.

Posted By: STLDuster

Re: 516 heads - 12/23/09 03:58 AM

Not a bad head with the bigger valves and some porting

I love mine!

Posted By: KillerBee

Re: 516 heads - 12/23/09 04:08 AM

Quote:

Not a bad head with the bigger valves and some porting

I love mine!

as long as you don't spend a bunch of $$$ on them.

Attached picture 5684464-launch.jpg

Posted By: dave571

Re: 516 heads - 12/23/09 05:12 AM

I don't want to sound like a jerk, but if we are being picky about numbers, isn't a numbers 361 not possible?

Only date coded would be possible, since 361's were prior to block vin stamping.

That said if it is beleived to be the original motor for the car, does it make any sense to stroke it, and cam it up, and the hope that the block doesn't get a window in it while bagging it?

Sorry I couldn't resist asking. Not trying to start a peeing match or anything.

In any case, back to the thread, I think a good port job will work with 516's, and 450" motor. Rpms will be a little more limited than with some of the newer heads since the intake runners are a smaller volume, but should still work.

Posted By: therocks

Re: 516 heads - 12/23/09 12:03 PM

The ones I had on my 440 had 2.14 and 1/81 stainless valves in them.They had been ported some also.I pullerd over 6500 all the time with them/They are on the kids 413 now.Porting like said you have to be careful.Its not too hard when doing them to hit water.Rocky

Posted By: moper

Re: 516 heads - 12/23/09 01:05 PM

I've made 450/490 on them, a med size hydraulic cam, and pump fuel. But those were not template ported... They went a bit beyond that. I think for the cash the Source heads would be the best fit in terms of cost, effort, sneakiest and most stock appearing head for it. If you want to use the 516s be careful as bigger is not always better and understand there will be power and rpm limits as a result of a long stroke and average at best port design/shape.

Posted By: zzyzxpat

Re: 516 heads - 12/23/09 01:22 PM

Quote:

I don't want to sound like a jerk, but if we are being picky about numbers, isn't a numbers 361 not possible?

Only date coded would be possible, since 361's were prior to block vin stamping.

That said if it is beleived to be the original motor for the car, does it make any sense to stroke it, and cam it up, and the hope that the block doesn't get a window in it while bagging it?

Sorry I couldn't resist asking. Not trying to start a peeing match or anything.

In any case, back to the thread, I think a good port job will work with 516's, and 450" motor. Rpms will be a little more limited than with some of the newer heads since the intake runners are a smaller volume, but should still work.

You are right. Just trying to do something a little different. It is a 66 Coronet. No way to verify that it is original ( it is. ) If done right and kept under 5000rpms, I think it will stay together. I have no experience with 516s, so the reason for my question. I have heard about hitting water with these. Thanks for your input. Pat

Posted By: StealthWedge67

Re: 516 heads - 12/23/09 03:40 PM

I've never heard of a 450" 361 combo. What Crank are we talking about? Without knowing anything about the specifics, my first reaction is that it sounds like a an awful short piston, for a street motor. (???) I don't know that I'd feel good about going this route with a #'s correct block (???). A 3.75 stroke should get you into the 420" neighborhood (just off the top of my head), and would still be a reliable street motor.

Posted By: zzyzxpat

Re: 516 heads - 12/23/09 04:05 PM

Quote:

I've never heard of a 450" 361 combo. What Crank are we talking about? Without knowing anything about the specifics, my first reaction is that it sounds like a an awful short piston, for a street motor. (???) I don't know that I'd feel good about going this route with a #'s correct block (???). A 3.75 stroke should get you into the 420" neighborhood (just off the top of my head), and would still be a reliable street motor.

My formula was 4.155 bore,4.250 stroke,6.535 rods, with a compression height of 1.320.
Open to suggestions if you think that is not the best for a street motor.

4.250 stroke,6.535 rod,1.320 compression height.

Posted By: dogdays

Re: 516 heads - 09/24/13 05:00 PM

That combo is done all the time with a larger bore, like in a 383 or 400 block, so the compression height shouldn't be an issue. Make sure the connecting rod doesn't run into the end of the bore somewhere around mid-stroke.

I applaud you for going into new waters, 361s are giveaway engines. I actually turned down one several years ago, and my motto is, "A man can't have too many pieces of cast iron aging in his back yard."

Your proposed engine is basically an Olds 455 with a little shorter rod and shorter comp height.

Dwayne Porter, aka Fast68, did a set of 516s as mentioned above. He is a really good source even if you are going to do the work yourself. I don't think he'll worry about the competition!

If I was your tech adviser I'd steer you directly to the Stealth heads. Out of the box they will be worth 100 hp over a home ported set of 516s, and they will have an advantage from idle to redline.

But either way it will honk at low rpm. You'd better buy a set of 2.76s for your 8 3/4!

R.

Posted By: GTX MATT

Re: 516 heads - 09/24/13 06:13 PM

Quote:

Your proposed engine is basically an Olds 455 with a little shorter rod and shorter comp height.

And better oiling system. And better heads. And better block.

Posted By: Cab_Burge

Re: 516 heads - 09/24/13 07:33 PM

Quote:

Quote:

I've never heard of a 450" 361 combo. What Crank are we talking about? Without knowing anything about the specifics, my first reaction is that it sounds like a an awful short piston, for a street motor. (???) I don't know that I'd feel good about going this route with a #'s correct block (???). A 3.75 stroke should get you into the 420" neighborhood (just off the top of my head), and would still be a reliable street motor.

My formula was 4.155 bore,4.250 stroke,6.535 rods, with a compression height of 1.320.
Open to suggestions if you think that is not the best for a street motor.

4.250 stroke,6.535 rod,1.320 compression height.

413 and 361 have the same stock bore, 4.180 I beleive

Not 4.155

Posted By: Twostick

Re: 516 heads - 09/24/13 08:55 PM

361 stock is 4.125 so .030 over puts him at 4.155.

Kevin

Posted By: AAR-B4

Re: 516 heads - 09/24/13 10:13 PM

The 452 heads have induction hardened exhaust seats, if you're gonna run pump gas.
Just sayin................

Posted By: Dean_Kuzluzski

Re: 516 heads - 09/24/13 10:36 PM

Quote:

I'd steer you directly to the Stealth heads. Out of the box they will be worth 100 hp over a home ported set of 516s,

OOTB!

100 HP??

I'd like to see some real world dyno data on that. Must be bone stock 516's. A fare comparison would be some MP template ported 516's with the same size valves, fresh valve job, good guides.

Posted By: dogdays

Re: 516 heads - 09/25/13 05:13 PM

My point about the Olds 455 was that this combo has already been OEM and to give some idea about what kind of engine to expect. I grew up with a 455 and for tire smoking torque it was hard to beat. With the stock 2.56 rear end it'd cruise effortlessly at 90, to boot!

The 100 hp? Comparing stock 516 heads with a decent valve job with out-of-the-box Stealths there is at least a 50 cfm advantage going to the stealths. With a 450+ cubic inch engine under them, the Stealths WILL make 100 hp more than the stock 516s.

And if you want to spend $1500 to get the 516s to equal the Stealths in terms of flow, don't come crying when they crack and turn into doorstops!

R.

Posted By: robnbird

Re: 516 heads - 09/25/13 05:52 PM

Quote:

Quote:

Not a bad head with the bigger valves and some porting

I love mine!

as long as you don't spend a bunch of $$$ on them.

like the challey

Posted By: robnbird

Re: 516 heads - 09/25/13 05:56 PM

Quote:

Quote:

I'd steer you directly to the Stealth heads. Out of the box they will be worth 100 hp over a home ported set of 516s,

OOTB! 100 HP??

I'd like to see some real world dyno data on that. Must be bone stock 516's. A fare comparison would be some MP template ported 516's with the same size valves, fresh valve job, good guides.