Re: Questions about my 426 build

[Marcus Edell <marcusedell@xxxxxxxxxxx>]

Ditto as to boring the 413 to 426..never had an issue..ran cool and trouble free.. my 63 Dodge is running a 65 413 punched out to 426 with Stage II Top end
--
Marcus"Hot Rod"Edell-The RevTones www.myspace.com/revtones www.revtones.net 

-------------- Original message -------------- 
From: Don Gallimore <dongallimore@xxxxxxx> 

> 
> I ran a 413 bored 426 on the street for a couple of years when I first 
> got my '65. I've have read where a 413 can be safely overbored to make 
> it a 426 without a second thought although I can not give you the 
> reference. HOWEVER, the sonic testing before you spend good money 
> building this motor still sounds like a good insurance policy. 
> 
> This showed up as I was cleaning out my old e-mail and talks about the 
> 413/426 max wedge, notching the top of the bore and even the factory 
> overboring a 413 to make a 426 block. 
> *http://racehemi.maxwedge.com/topics/castings.php* It's really a good 
> site to read about Max Wedge cars and the 64-65 Hemis. 
> 
> Akron Don 
> 
> intiaboats@xxxxxxxx wrote: 
> > I am at the point of having 2 old 413 blocks('63 1852029, '64 2205697) 
> cleaned, magnafluxed, sonic checked and, if they pass inspection, bored 4.25" to 
> bring displacement to 426ci. I have one set of 426 pistons, 2 forged cranks(from 
> same blocks), original main caps, etc. and have collected the rest of the 
> studs/bearings/etc.(new). I haven't bought connecting rods, yet, but will do so, 
> as I have no idea how many miles are on the originals and, while I could have 
> them magged/sonic checked, fatigue of metal can't be checked, non-destructively. 
> > 
> > Assuming blocks check out, my questions are as follows: 
> > 
> > I have several pairs of heads(516s, 906s, 2x 452s). One pair of 452s are 
> rebuilt & decked 0.0005", 2.08" Int., 1.74" Exh., 81.5cc, hardened exhaust valve 
> seats. These are the heads that I plan to go with. 
> > 
> > Will blocks need notches for exhaust valves? This is my greatest concern, as I 
> don't want to bend/break valves when I crank her over. 
> > 
> > Will the increased chamber volume of the 452s(81.5cc), over the original 
> 516s(73.5cc), decrease compression ratio to an acceptable level? 
> > 
> > I'm assuming that the increased cc volume would reduce compression, am I 
> correct? 
> > 
> > how will the increased bore affect compression? 
> > 
> > If I understand correctly, 452s are open-chamber, whereas 516s are closed. How 
> does this effect compression? 
> > 
> > Am I going to have to measure swept volume, etc., or will bolting them on & 
> trying to run them be o.k.? 
> > 
> > The fuel delivery will be through 2xquads(probably Edelbrock), mounted on a 
> 1959 2x4v manifold(1854817). I understand that I'll have to have the manifold 
> sides shaved(0062") to complement the milled heads(.0005"). 
> > 
> > Thanks, in advance, for all advice, suggestions, criticism. If I ask 
> supplemental questions to anyone's opinions, please don't take offense, I would 
> do so to further understand what your saying, not questioning your knowledge 
> base. 
> > 
> > The first engine I build is for my '65 Sport Fury, presently a 318Poly. The 
> second may, or may not, find it's way into my '56 Coronet. I'll be sticking with 
> non-roller cam/lifters for now, as the cost of rollers would be over my budget. 
> > 
> > Mike 
> > P.S.: Whenever the complexities of these big Mopars gets overwhelming, I get 
> on YouTube and look at the finished products! 
> > 
> > 
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> > 
> > ---- 
> > Please address private mail -- mail of interest to only one person -- directly 
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> > 
> > '62 to '65 Mopar Clubhouse Discussion Guidelines: 
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> > 
> > 
> > 
> 
> 
> ---- 
> Please address private mail -- mail of interest to only one person -- directly 
> to that person. I.e., send parts/car transactions and negotiations as well as 
> other personal messages only to the intended recipient, not to the Clubhouse 
> public address. This practice will protect your privacy, reduce the total volume 
> of mail and fine tune the content signal to Mopar topic. Thanks! 
> 
> '62 to '65 Mopar Clubhouse Discussion Guidelines: 
> http://www.1962to1965mopar.ornocar.org/mletiq.html. 
> 
> 
--
[Non-text portions of this message have been removed]


----
Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html.