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273 closed chamber heads good? bad? #673407 04/18/10 07:24 AM 04/18/10 07:24 AM
Joined: Dec 2005 Posts: 151 Ohio R RonaldV OP member
RonaldV OP member R Joined: Dec 2005 Posts: 151 Ohio	Hi all, Im looking at getting a 360 cheap and want to do a engine swap in my old sweptline. I ran into a set of small block closed chambered heads at a swap meet yesterday. Casting no. 2465315. My book says they are from a 65-66 273. They have had work done on them just last year. Ported out, new guides, PC valve seals, milled .015 they look good. I dont know what size valves are in them. The guy wants $300 for them. Im thinking the closed chamber would bump my smog 360 up to a more desireable compression. Has anyone every used this head on a 360?? Any advice? Thanks RV

Re: 273 closed chamber heads good? bad? [Re: RonaldV] #673408 04/18/10 08:04 AM 04/18/10 08:04 AM
Joined: Jan 2004 Posts: 5,476 3 340dart4spd Parts Problem
340dart4spd Parts Problem 3 Joined: Jan 2004 Posts: 5,476	I wouldn't use them.. go with the later 67 up 273 heads..It's been awhile but I am pretty sure you will have problems using them..As I recall head bolts are on a different angle on early 273 are diff....or was it head bolts? Last edited by 70CoronetR/T; 04/18/10 08:19 AM.

Re: 273 closed chamber heads good? bad? [Re: RonaldV] #673409 04/18/10 09:07 AM 04/18/10 09:07 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	If these are the 273 heads that dont have the oddball intake bolt angle I think they'd work excellent for a low rpm torque eng and for sure would bump the CR which is always needed. For that price are the valves new also? I'm not sure if PC type seals keep too much oil out of the guides for a daily driver and if someone confirms (or not) that that is the case they could be removed and just use umbrellas. live every 24 hour block of time like it's your last day on earth

Re: 273 closed chamber heads good? bad? [Re: RapidRobert] #673410 04/18/10 09:21 AM 04/18/10 09:21 AM
Joined: Jan 2004 Posts: 5,476 3 340dart4spd Parts Problem
340dart4spd Parts Problem 3 Joined: Jan 2004 Posts: 5,476	Quote: If these are the 273 heads that dont have the oddball intake bolt angle I think they'd work excellent for a low rpm torque eng and for sure would bump the CR which is always needed. For that price are the valves new also? I'm not sure if PC type seals keep too much oil out of the guides for a daily driver and if someone confirms (or not) that that is the case they could be removed and just use umbrellas. Here is some more info http://www.allpar.com/mopar/4bbl.html

Re: 273 closed chamber heads good? bad? [Re: 340dart4spd ] #673411 04/18/10 09:30 AM 04/18/10 09:30 AM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	The intake bolt angle isn't an issue. Even though it is at a slightly different angle. I have a Performer intake on a 65 273, no problems. To be honest, if you had a set of 273 heads lying around (FREE) and had no money to do anything else, then they'd work on a 360. But it's kinda of like getting a new exhaust system and stepping down from a 2.5" dual exhaust to a 1 7/8" single. It'll work, but it's not ideal, nor an improvment. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 273 closed chamber heads good? bad? [Re: Supercuda] #673412 04/18/10 09:49 AM 04/18/10 09:49 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	I have done a few stock 360 with the #302 closed chamber heas not a high rpm race engine but it will up the CR and give it lots of torque down low for a work truck or 4x4 up the exhast vale to a 1.60 and home pocket port the exhast side read the torque monster write up in the tech archives for a good base combo I do them for the torque in the work truck that do a good bit of towing/hauling

Re: 273 closed chamber heads good? bad? [Re: scratchnfotraction] #673413 04/18/10 02:26 PM 04/18/10 02:26 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	if you want performance, I'd spend the extra $400 and buy these heads from hughes all new castings, and flow significantly better than the small port heads. get some used magnum rockers, and measure for the proper pushrods, and with a cam in in the comp XE262 size range, you'll have a motor that is probably an honest 350hp/400tq motor. 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: 273 closed chamber heads good? bad? [Re: patrick] #673414 04/18/10 03:37 PM 04/18/10 03:37 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	I've done the 302's on a 360 thing too, nice with an M body, 2.94 gears and a stick. But it only cost me the price of a set of gaskets to do this. Was easier than trying to fix the pulled out exhaust stud threads that caused me to pull the J heads. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 273 closed chamber heads good? bad? [Re: 340dart4spd ] #673415 04/18/10 03:39 PM 04/18/10 03:39 PM
Joined: Jul 2003 Posts: 1,107 Spring Valley ,Ca. moparsquid super stock
moparsquid super stock Joined: Jul 2003 Posts: 1,107 Spring Valley ,Ca.	I believe that the 64 blocks were the last to have the odd bolt pattern, unless these heads floww really good i wouldnt use them (small valves) there are alot of after market heads that are inexpensive and run great.

Re: 273 closed chamber heads good? bad? [Re: moparsquid] #673416 04/18/10 05:29 PM 04/18/10 05:29 PM
Joined: Sep 2003 Posts: 1,535 North Las Vegas chewy pro stock
chewy pro stock Joined: Sep 2003 Posts: 1,535 North Las Vegas	Really, you should find out which year they are, Valve Size and Whether they've been changed over to hardened seats. $300 seems good deal if they are the '66 head and have upgraded Larger Valves and Hardened Seats. Quote: I believe that the 64 blocks were the last to have the odd bolt pattern, unless these heads floww really good i wouldnt use them (small valves) there are alot of after market heads that are inexpensive and run great. 64 & 65 273's had the smaller Intake bolt and different mounting angle. They changed the head in 66 to what is on 66-90_something LA blocks. You can get later intakes to fit on them by griding out the holes a bit, but you still end up with funky bolt angle against the intake. There are 64-65 intakes that were built by edelbrock, offenhouser and others. Like the Edelbrock D4B, Like the LD4B except built for the early 273.

Re: 273 closed chamber heads good? bad? [Re: chewy] #673417 04/18/10 09:24 PM 04/18/10 09:24 PM
Joined: Dec 2005 Posts: 151 Ohio R RonaldV OP member
RonaldV OP member R Joined: Dec 2005 Posts: 151 Ohio	UPDATE The valves have been upgraded to 360 valves. There has been bowel work done and porting. He did not put in hardened seats though. He says hes tried 2 different intakes on it, a torqer and RPM and it bolts on fine. He has run a 13.75 in his 63 plymouth with a mild cammed 360 with the heads. For 300 bucks, I think I might try them. The main advantage is it would up my compression. Fish

Re: 273 closed chamber heads good? bad? [Re: RonaldV] #673418 04/18/10 10:57 PM 04/18/10 10:57 PM
Joined: Jan 2004 Posts: 5,476 3 340dart4spd Parts Problem
340dart4spd Parts Problem 3 Joined: Jan 2004 Posts: 5,476	Quote: UPDATE The valves have been upgraded to 360 valves. There has been bowel work done and porting. He did not put in hardened seats though. He says hes tried 2 different intakes on it, a torqer and RPM and it bolts on fine. He has run a 13.75 in his 63 plymouth with a mild cammed 360 with the heads. For 300 bucks, I think I might try them. The main advantage is it would up my compression. Fish will the larger valves even fit in the small closed chamber early 23h head??

Re: 273 closed chamber heads good? bad? [Re: 340dart4spd ] #673419 04/18/10 11:28 PM 04/18/10 11:28 PM
Joined: Sep 2003 Posts: 1,535 North Las Vegas chewy pro stock
chewy pro stock Joined: Sep 2003 Posts: 1,535 North Las Vegas	Yup, the 360 valves would fit. Once done, though, you cant put on a 273 without notching the top of the cylinder for clearance. -- If all is true, its a good deal.

Re: 273 closed chamber heads good? bad? [Re: chewy] #673420 04/18/10 11:31 PM 04/18/10 11:31 PM
Joined: Jan 2004 Posts: 5,476 3 340dart4spd Parts Problem
340dart4spd Parts Problem 3 Joined: Jan 2004 Posts: 5,476	Quote: Yup, the 360 valves would fit. Once done, though, you cant put on a 273 without notching the top of the cylinder for clearance. -- If all is true, its a good deal. wouldnt it make more sense to just go with a 302 head..

Re: 273 closed chamber heads good? bad? [Re: 340dart4spd ] #673421 04/18/10 11:33 PM 04/18/10 11:33 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: will the larger valves even fit in the small closed chamber early 23h head?? According to the allpar thread quoted earlier yes iirc he went from 1.78 to 1.88 intakes and it's a good read (you'll be there awhile) live every 24 hour block of time like it's your last day on earth

Re: 273 closed chamber heads good? bad? [Re: RapidRobert] #673422 04/19/10 11:31 PM 04/19/10 11:31 PM
Joined: Dec 2005 Posts: 151 Ohio R RonaldV OP member
RonaldV OP member R Joined: Dec 2005 Posts: 151 Ohio	can You find me a set of 302 heads for this price?? This is a low buck combo Im putting together, not a race motor. Its going into a beat up 65D100 that pulls my cuda, hauls mulch, and takes me to the hardware store on the weekends. Im putting the heads on a 360 that I paid $75 bucks for. Low buck is the prime factor here, not high horsepower or quarter mile times. To me these heads would be a cheap way to raise compression and give me some extra power for little cash. But, if you have a set of 302s for the same price, Ill buy those instead. Fish

Re: 273 closed chamber heads good? bad? [Re: RonaldV] #673423 04/20/10 01:56 AM 04/20/10 01:56 AM
Joined: Jan 2003 Posts: 857 The Dalles, OR. D Dusted_Ya super stock
Dusted_Ya super stock D Joined: Jan 2003 Posts: 857 The Dalles, OR.	Too bad your not closer I know where there is a low mile 87 Fifth Avenue motor and tranny for $350. I think what everyone is trying to tell you is it's kinda risky. Yes your compression will increase but is the power increase from that going to offset small port performance and no hardened seats? It may work well pulling your car but unless your running premium and a lead substitute (which gets spendy and obnoxious) your exhaust valves will probably not survive too long.

Re: 273 closed chamber heads good? bad? [Re: RonaldV] #673424 04/20/10 09:36 AM 04/20/10 09:36 AM
Joined: Dec 2004 Posts: 1,061 New Mexico D dmerc super stock
dmerc super stock D Joined: Dec 2004 Posts: 1,061 New Mexico	Those are good heads and with 360 valves will perform good and deliver good gas mileage. But you will need the special manifold for them (I have a four barrel version if interested) or you can use spherical self aligning washers on any regular manifold.

Re: 273 closed chamber heads good? bad? [Re: dmerc] #673425 04/20/10 10:01 AM 04/20/10 10:01 AM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	if they're fresh with the 1.88 valves, I think I'd do it. for a cam in a truck, I'd use a comp XE250 or 256, or a lunati vood00 60400 or 60401 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: 273 closed chamber heads good? bad? [Re: patrick] #673426 04/20/10 10:58 AM 04/20/10 10:58 AM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	They will make more power than a 302 because they have a smaller chamber and better flowing ports, not to mention the 360 size valves in that set. I have ran those heads and other mopar non-hardened seat heads on modern pump gas and had no problems, these are not chevy heads witch are pretty much gauranteed to recess their seats. I am not causing global warming, I am just trying to hold off a impending Ice Age!

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