Home | Register | Login | Contact Us

 
Auto Math
Classifieds
Forum
Gallery
Games
Garage
Tech Articles
Utilites
 
FAQFAQ    SearchSearch    RegisterRegister    Log inLog in    Log in to check your private messagesLog in to check your private messages    Forum Subscriptions1/4 Mile Table 

any help or info is appreciated!!!!

 
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Mopar - Small Block
View previous topic :: View next topic  
Author Message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Fri Jul 17, 2009 7:44 am    Post subject: any help or info is appreciated!!!! Reply with quote

im gonna have a visitor soon to drop off a 340 sbm
dont know which heads
its a 4 speed duster

what is a good combo?????

_________________
Back to top
View user's profile Send private message
Big Dave
Moderator


Joined: 04 Dec 2005
Posts: 2646
Location: Tampa Florida
119973.02 points



PostPosted: Fri Jul 17, 2009 5:27 pm    Post subject: Reply with quote

Unlike a 23 head on the SBC the Mopar has an 18 angle from the factory which explains why a 340 can beat up on a 350. Not all have big valves though (1.88 being stock for he intake valve and 2.02: intakes only found in the J heads, the equivalent for a fuelie head for mopars).

Big Dave
Back to top
View user's profile Send private message
coppergmc
Member


Joined: 19 Dec 2005
Posts: 278
Location: Georgia
5857.30 points



PostPosted: Fri Jul 17, 2009 7:09 pm    Post subject: Reply with quote

All the basics that work on a SB chevy will work on the mopar. One problem I've noticed is that some pistons don't go any where close to the top of the block deck. Also, some of the already modified X or J heads need some extra attention under the valves. They will clean up good but seem to be made of an alloy slightly harder than the chevy heads and take longer to port.

Most of the mopar guys around here that are running strong street engines like KB pistons. I guess they are cheaper than forged and seem to hold up good.

One guy swears by an old purple shaft (I think it's got .484 lift) with Rhoads anti-pump lifters and another guy uses nothing but comp's XE grinds for the street. I prefer comp's in just about everything.

The M-1 single plane intake is popular around here too. But, if I went with the .484 lift cam, I'd probably opt for an air-gap intake.

Wish I could help. I kinda like the engines. Just don't see many of them any more.
Back to top
View user's profile Send private message
Big Dave
Moderator


Joined: 04 Dec 2005
Posts: 2646
Location: Tampa Florida
119973.02 points



PostPosted: Fri Jul 17, 2009 11:05 pm    Post subject: Reply with quote

coppergmc wrote:
All the basics that work on a SB chevy will work on the mopar. One problem I've noticed is that some pistons don't go any where close to the top of the block deck. Also, some of the already modified X or J heads need some extra attention under the valves. They will clean up good but seem to be made of an alloy slightly harder than the chevy heads and take longer to port.

Most of the mopar guys around here that are running strong street engines like KB pistons. I guess they are cheaper than forged and seem to hold up good.

One guy swears by an old purple shaft (I think it's got .484 lift) with Rhoads anti-pump lifters and another guy uses nothing but comp's XE grinds for the street. I prefer comp's in just about everything.

The M-1 single plane intake is popular around here too. But, if I went with the .484 lift cam, I'd probably opt for an air-gap intake.

Wish I could help. I kinda like the engines. Just don't see many of them any more.


The heads were induction hardened to get a hard valve seat for unleaded gas. Induction hardening unlike a flame is an area treatment not a point application, so it hardened everything around the seats like in the bowl and throat. hardening decreased as a square of the distance, but since they heated the heat to 1,700 degrees and let them air cool it gets pretty hard.

Big Dave
Back to top
View user's profile Send private message
coppergmc
Member


Joined: 19 Dec 2005
Posts: 278
Location: Georgia
5857.30 points



PostPosted: Sat Jul 18, 2009 4:08 pm    Post subject: Reply with quote

No wonder, it took me all day to pocket port those heads! Does that have anything to do with some of the heads being prone to crack? We went through about three sets before we found heads that weren't cracked. I think those might have been slightly newer than the old J heads though.

It would be nice to find some after market heads. IMO the dodge heads really have some awsome flow potential. Just have to do a lot of work to get the stockers to flow. Seems like I saw some flow specs on a 340/360 head from Edelbrock that flows about 250 cfm @ .500 lift and can flow a lot more with work.
Back to top
View user's profile Send private message
Big Dave
Moderator


Joined: 04 Dec 2005
Posts: 2646
Location: Tampa Florida
119973.02 points



PostPosted: Sun Jul 19, 2009 12:48 am    Post subject: Reply with quote

Yes it does explain why they are prone to cracking. Induction hardening is the dumbest thing I have ever heard of for a cast head, but it is cheap and fast. Indy makes great heads for Ma Mopar, but like AFR they are not cheap. I have found Edelbrokes to be the goldilocks of heads: not the bigest or baddest, but not the worst either, and the price is just right for the quality of the head and components bolted to it.

Big Dave
Back to top
View user's profile Send private message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Fri Jul 24, 2009 7:48 pm    Post subject: Reply with quote

are alot of the heads a 64 cc chamber





i should just wait till i see what heads he has!!!!!

_________________
Back to top
View user's profile Send private message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Wed Jul 29, 2009 7:38 pm    Post subject: Reply with quote

WELL I PICKED UP THE 340

it has the j heads
no carb or distributor

anyone know what kind of ignition they used in the early 70's

i dont wana use points if i dont have to

if it is a points distributor what would be a good upgrade????

_________________
Back to top
View user's profile Send private message
10sec.et
Member


Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Thu Jul 30, 2009 12:08 am    Post subject: Reply with quote

the Pertronix Ignitor works pretty well for the money. just dont let them sit with key on, engine off. they will fry. i also noticed that after about 5 years or so, mine started dropping out and wouldnt start after heat soak. let it cool down and its fine until it heats up again.
_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

Back to top
View user's profile Send private message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Thu Jul 30, 2009 1:10 pm    Post subject: Reply with quote

good info and makes perfect sense

this must be why im always told they are junk

never thought of the koeo problem!!

_________________
Back to top
View user's profile Send private message
ARK
Newbie


Joined: 10 Nov 2009
Posts: 4

267.08 points



PostPosted: Tue Nov 10, 2009 3:40 am    Post subject: Reply with quote

NO NEED TO USE POINTS THE 340 HAD CHRYSLER ELECTRONIC IGNITION IN THE EARLY 70S THEY WERE THE FIRST OF THE BIG THREE TO INSTALL IT AS A RPO. OPTIONAL IN 1971 AND STANDARD FROM 1972 ON I BELIEVE
IT IS STILL ONE OF THE BEST FACTORY IGNITIONS MADE AT THAT TIME SIMPLE WITH PERFORMANCE VARIATIONS UP TO 10000 RPM. IT WAS SUPERSEDED BY THEIR CRANK TRIGGER IGNITION A FEW YEARS LATER. YOU CAN FIND PARTS INCLUDING THE DISTRIBUTOR AND MODULE AT ALMOST ANY PARTS STORE, BUT THE MOPAR ORANGE BOX WAS GOOD TO 6000 RPM AND THE MOPAR CHROME BOX TO 8000 RPM THE GOLD BOX PN 4120600 WAS GOOD UP TO 10000 RPM BUT I BELIEVE IT WAS DESIGNATED RACE ONLY.
Back to top
View user's profile Send private message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Tue Nov 10, 2009 8:31 pm    Post subject: Reply with quote

well i think the car is a 70 duster i assume there will be points in it
i asked him for it so i can see it
ive been lookin at the mopar orange and blue module and dizzy

_________________
Back to top
View user's profile Send private message
af2
Member


Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Tue Nov 10, 2009 10:46 pm    Post subject: Reply with quote

Please,
turn the CAPS off.
Mopar has a good module compared to ford.

As in all modules, have a replacement to get you home.
Back to top
View user's profile Send private message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Wed Nov 11, 2009 2:53 am    Post subject: Reply with quote

af2 wrote:


As in all modules, have a replacement to get you home.






spoken like a true gm fan Wink

_________________
Back to top
View user's profile Send private message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Sat Nov 14, 2009 12:42 am    Post subject: Reply with quote

so im figuring out comp ratio (or starting to)
pistons are .018 out of the hole
i did the .500 inch perfect cylinder aproach to figuring volume
if the heads are 72.5 cc 9.25 to 1
ill measure tomorow ...i hope they are a little smaller

valve angle may be great on these but ill take my chevy chambers over this no squish pad garbage

_________________
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Mopar - Small Block All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum
Home | Contact Us | Automath | Cam Files | Dyno Search | Forum | Garage | Picture Gallery | Reaction Timer

Copyright 1997-2016 SMOKEmUP.com All rights reserved.
Advertising Info     Disclaimer     Privacy Policy