Mopar 273 Commando projet, Mopar Magnum valves, Stroker sleeper, Mopar 920 heads

[PRH]

I’m sure there have been some really mild iterations built here since the Ede SMB heads have been on the scene(the OG aluminum replacement head), but I don’t recall any specifics.

I do recall a few of the “Hotter” SS/bracket race builds though.
My experience is that without any type of extraordinary efforts or exotic parts, power levels of 525hp+ are pretty easily achieved.
No bigger than supplied valves, no Herculean porting efforts, no tubes…….. just a decent vj and enough porting to get into the 265-270cfm range(which is way way less work on these heads than any factory iron head).

The easy button for ported iron heads in an application like what Charles customer is building, is to start out with some x/j style heads and have them cnc ported by Dave at KG Engines.
30+cfm more than the 920’s in this thread.

 

[273]

I don't agree with it, because it's misleading. Guys trust this **** and copy it, spend lots of time and money, only to get **** results.

Just calling a turd a turd.

Why should anyone run stock SBM heads:

I see what your saying but I never said they should, I just find it interesting what people can do with them, I'm in the more information the better camp. As for it leading people astray unfortunately that's up to them to work through, even good info leads people astray they can become over focus on one or two or so bits of info and are blinded by it like Torque, CR, velocity etc.. Velocity I find funny because people warn of it's importance but generally have zero idea of how much you have or should be shooting for, just smaller is better.

 

[PRH]

To help illustrate how far behind you’re starting out by using the 920 vs the x/j heads……..

-Untouched J head from the factory, used valve job and factory tulip style 2.02 valve is typically in the 200cfm range.

-Installed 11/32 guides and tested using a 2.02” SBC valve………. Seat machined and added a 75* bowl cut…….. leaving this as a starting point for porting.

Even this flows 215cfm-

-Basic clean up of entire port, no guide boat-tailing, no chamber mods…….. 250+

 

[junkyardhero]

I'm in the more information the better camp.

at what point does information just become noise?

 

[Newbomb Turk]

at what point does information just become noise?

It’s only noise to those who ignore it.

 

[junkyardhero]

It’s only noise to those who ignore it.

i'm sorry what were you saying? i wasn't paying attention...

 

[Newbomb Turk]

i'm sorry what were you saying? i wasn't paying attention...

lol. I see you are starting the new year off full of piss AND vinegar!

 

[junkyardhero]

lol. I see you are starting the new year off full of piss AND vinegar!

every great journey begins with the first step!

besides, i learned from the best! ;D

 

[273]

at what point does information just become noise?

I'd say it depends on the individual, even good information can be noise if you could careless about it and bad information can be valuable in not what to do and some information don't become valuable until you learn something else.

 

[stroker402]

last winter when I was building another 273 I worked the 920 heads over with just cleaning up on the ports rough surfaces and flashing and gasket match and I picked up alot more hp just by doing those steps... no valve job either. enough power to take on my buddies and come out ahead in a street race ... we were even before. those were abodies 67cuda and 70duster 70 swinger. cuda has built 340 with x heads , built 360 in a 70 dart swinger and a stock magnum 380 hp 70duster 3500 stall headers 391 gear flows. no one has beat my 65 barracuda formula S 273 so far. it's a 273 screamer ! read my post "273 command build" . You just can't tell me that 273's have NO POWER. most people here have no clue what a 273 is capable of doing. all they do it cut them down. AND I ONLY BUZZ IT TO 58OO RPM SHIFTS.