Re: 65 to 68 'B' block variations?
[Re: chargerbr549]
#2748809
03/04/20 01:40 AM
03/04/20 01:40 AM
|
Joined: Jan 2003
Posts: 2,673 Northern MN
1E2C
OP
master
|
OP
master
Joined: Jan 2003
Posts: 2,673
Northern MN
|
Okay, I had forgotten the lifter differences with the pre 68 having the smaller bottom ends. The 516 closed chamber heads I didn't think would have a major impact on the bottom end. I mean the lifters/cam are typically serviced separately, aren't they?
Last edited by 1E2C; 03/04/20 01:42 AM.
|
|
|
Re: 65 to 68 'B' block variations?
[Re: dOrk !]
#2748835
03/04/20 08:58 AM
03/04/20 08:58 AM
|
Joined: Jan 2003
Posts: 6,391 Abilene, Texas
fastmark
master
|
master
Joined: Jan 2003
Posts: 6,391
Abilene, Texas
|
You’ll just need to be careful about piston choices. I’ve been going through the same thing selecting pistons. The blocks are the same. It’s the pistons and heads that were different. Don’t think you can even buy the early lifters. Just get later pushrods. Don’t get the cheap ones with the balls welded on the end. My customer had one break off and cause catastrophe failure. My build is using later open chambered heads and seal power forged pistons with the higher compression height. They make cast pistons with a lower compression height. I don’t use the KB hyperutectic. I’m out of town visiting with the kids but I can dig out my measurements by tomorrow morning and post them. It should help you out.
See my post below. I had some time to kill and had my infor with me.
Last edited by fastmark; 03/04/20 12:27 PM.
|
|
|
Re: 65 to 68 'B' block variations?
[Re: 1E2C]
#2748882
03/04/20 10:46 AM
03/04/20 10:46 AM
|
Joined: Sep 2003
Posts: 421 montana
BANDIT
mopar
|
mopar
Joined: Sep 2003
Posts: 421
montana
|
On my buddies ‘66 383 4-bbl motor, we are just using the later low compression 2 bbl pistons. It’s a stock rebuild, so they are cast, compression ht was very close if I remember correctly. Stuff will be back from machine shop Friday nite, I can compare them again. Jim.
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
|
|
|
Re: 65 to 68 'B' block variations?
[Re: dOrk !]
#2748949
03/04/20 02:35 PM
03/04/20 02:35 PM
|
Joined: Jan 2003
Posts: 25,786 Rio Linda, CA
John_Kunkel
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,786
Rio Linda, CA
|
Lifter and cam diffs ?????
Yes, pre-'68 pushrod has a smaller ball lower tip and in '68 cam lobe profile changed.
The INTERNET, the MISinformation superhighway
|
|
|
Re: 65 to 68 'B' block variations?
[Re: John_Kunkel]
#2748995
03/04/20 05:01 PM
03/04/20 05:01 PM
|
Joined: Jul 2008
Posts: 30,424 Florida STAYcation
dOrk !
The village idiot's idiot
|
The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
|
Lifter and cam diffs ?????
Yes, pre-'68 pushrod has a smaller ball lower tip and in '68 cam lobe profile changed. Now THAT slipped my mind but I kind of read that initial post as the later model cam and lifters not fitting into a 65 block ...
|
|
|
Re: 65 to 68 'B' block variations?
[Re: dOrk !]
#2749009
03/04/20 06:11 PM
03/04/20 06:11 PM
|
Joined: Jan 2003
Posts: 2,673 Northern MN
1E2C
OP
master
|
OP
master
Joined: Jan 2003
Posts: 2,673
Northern MN
|
Lifter and cam diffs ?????
Yes, pre-'68 pushrod has a smaller ball lower tip and in '68 cam lobe profile changed. Now THAT slipped my mind but I kind of read that initial post as the later model cam and lifters not fitting into a 65 block ... So I stated it poorly, John showed exactly what I meant to say. :-P
|
|
|
Re: 65 to 68 'B' block variations?
[Re: fastmark]
#2749010
03/04/20 06:15 PM
03/04/20 06:15 PM
|
Joined: Jan 2003
Posts: 2,673 Northern MN
1E2C
OP
master
|
OP
master
Joined: Jan 2003
Posts: 2,673
Northern MN
|
My suggestion is for you to use the tutorial on the JE piston website and figure your compression ratio with long math and not an online calculator. You can more easily see what changes make the difference in CR.
Good luck. No easy answers, huh?? Really it just means I have to get it all torn down so I can start with some known values - I did rebuild it once already, but I looked up the paperwork today and it's not much help as most of the part numbers have changed since 1983 and my memory isn't that precise. Thanks, I think I'll give up on the shortcuts................
|
|
|
Re: 65 to 68 'B' block variations?
[Re: fastmark]
#2749195
03/05/20 10:21 AM
03/05/20 10:21 AM
|
Joined: Sep 2003
Posts: 421 montana
BANDIT
mopar
|
mopar
Joined: Sep 2003
Posts: 421
montana
|
Yes, we are using stock 516 head, I had bought the pistons from the machinist. We just compared CH rather crudely by shoving a pin thru both pistons. Now I’m curious how accurate that was. Guess I’ll know tomorrow nite when he brings stuff over. Jim
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
|
|
|
|
|