Questions about my 426 build

[intiaboats@xxxxxxxx]

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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