Re: 413 to 426 CI
[Re: Dodgem]
#1279323
08/05/12 09:28 AM
08/05/12 09:28 AM
|
Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
|
Quote:
Actually 413's are 4.1875 so it's only .0625
That is what was stuck in the back of my head but went to Alpar for confirmation and found what I posted. Been a while since friend had his dad bore his last one (about 1988) and was thinking the .0625 but for some reason Alpar through a curve at me.
|
|
|
Re: 413 to 426 CI
[Re: MoparforLife]
#1279324
08/05/12 10:01 AM
08/05/12 10:01 AM
|
Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
|
master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
|
Yea an oddball bore the +.060 pistons are 4.2475. friend built one with the still somewhat available pistons and had it finished honed to 4.250. extra clearance for performance decked the block and milled the edelbrock home ported heads to get 10.5 to 1 ran low 12's Hughes used to have some old stock pistons can't find them any more problem with the old stock pistons they were about .080 down the hole. A stock 426 piston would work nice but if you find any they are 30 and 60 over! I've heard of people boring 413's .100 or more. TRW/Sealed power used to stock +.100 pistons for 440's?? I sold a block cheap to a guy had rust line where ring sat deeper that +.060 would clean up and I said it needs a sleeve he said no I'm ordering in +.100 pistons this will be the third one i built this way this was 16 years ago ish and the +.100's were still available!
Last edited by Dodgem; 08/05/12 10:29 AM.
|
|
|
Re: 413 to 426 CI
#1279329
08/05/12 01:15 PM
08/05/12 01:15 PM
|
Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
|
master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
|
Well .067 if decks are full spec. still deck it down .027 and with the 413 closed chamber heads milled a bit to make up for the fel pro gasket not hard to get it to 10 to 1 or more.
Easy 9.6 to 1.
Think the original 413 are .082 down!
Last edited by Dodgem; 08/05/12 01:17 PM.
|
|
|
Re: 413 to 426 CI
[Re: Dodgem]
#1279330
08/05/12 01:22 PM
08/05/12 01:22 PM
|
Joined: Apr 2003
Posts: 1,832 Fort Morgan
1OFNONE
Has been a member for quite a few years, so relax.
|
Has been a member for quite a few years, so relax.
Joined: Apr 2003
Posts: 1,832
Fort Morgan
|
If you use the old industrial Block 413's with the extra meat in them you can bore to standard 440 comfortably. Stock eliminator guys used them for maxi clones all the time until repo blocks came out. I have one in my shop that was a warranty block with no stampings. Perfect for a maxi.
So the bartender says to the horse " Gee, Why the long face?"
|
|
|
Re: 413 to 426 CI
[Re: Dodgem]
#1279331
08/05/12 04:45 PM
08/05/12 04:45 PM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
Quote:
Well .067 if decks are full spec. still deck it down .027 and with the 413 closed chamber heads milled a bit to make up for the fel pro gasket not hard to get it to 10 to 1 or more.
Easy 9.6 to 1.
Think the original 413 are .082 down!
Well, I agree, although those numbers are a lot more difficult if you're running open chamber heads - say, if you swapped the poor-flowing 516 heads for later factory iron heads.
I'd also wonder if you'd get in trouble not having valve reliefs in the pistons if you start cutting on both the block and the heads.
I've posted recently that with a .050 cut on my Edelbrock heads, my 413's CR will be about 9.6 to one with pistons .080 in the hole. For a street car, that will be good enough - and a lot better than the 8.5 to one it has now with 906 heads even with steel shim head gaskets. If I absolutely had to have more than the milled Eddy heads will give me, or if I was starting from scratch instead of from a running engine, I'd just switch to a 440 block and use off the shelf pistons to build a zero-deck closed-chamber quench motor.
|
|
|
Re: 413 to 426 CI
#1279332
08/05/12 05:21 PM
08/05/12 05:21 PM
|
Joined: Apr 2003
Posts: 1,832 Fort Morgan
1OFNONE
Has been a member for quite a few years, so relax.
|
Has been a member for quite a few years, so relax.
Joined: Apr 2003
Posts: 1,832
Fort Morgan
|
IMO A zero deck quench motor is the inteligent build.
So the bartender says to the horse " Gee, Why the long face?"
|
|
|
Re: 413 to 426 CI
#1279333
08/05/12 07:05 PM
08/05/12 07:05 PM
|
Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
|
master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
|
Well, I agree, although those numbers are a lot more difficult if you're running open chamber heads - say, if you swapped the poor-flowing 516 heads for later factory iron heads.
I'd also wonder if you'd get in trouble not having valve reliefs in the pistons if you start cutting on both the block and the heads.
I've posted recently that with a .050 cut on my Edelbrock heads, my 413's CR will be about 9.6 to one with pistons .080 in the hole. For a street car, that will be good enough - and a lot better than the 8.5 to one it has now with 906 heads even with steel shim head gaskets. If I absolutely had to have more than the milled Eddy heads will give me, or if I was starting from scratch instead of from a running engine, I'd just switch to a 440 block and use off the shelf pistons to build a zero-deck closed-chamber quench motor.
yea hard to get the cr with the better flowing open chamber heads. I heard Eddy is coming out with a 75 cc street head??
|
|
|
|
|