RE: Questions about my 426 build

[Paul Lennemann <pjlenn@xxxxxxxxx>]

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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Here is a website where you can calculate your compression ratio in 
various configurations.

Paul L.
'63 Sport Fury
440/727
http://www.1962to1965mopar.ornocar.org/ml-lennemann63.html


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