390 Cadillac New guy

nosgood

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Yeah, we usually stick to talking about the big Cadillac engine's around here. I guess it's just too damn hard to find good speed parts. How's the build going?
 

Roothawg

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I actually haven't done much. I have the motor disassembled and I have been calling around to every lead I get on Caddy gurus. I have met some nice people, but still haven't found "that guy" that is all knowing. I am building a folder of info. I think I have a cam figured out and Venolia said they will build me a custom set of pistons. I am getting ready to take it to the machine shop, once I get all of the grinding and smoothing done. I tend to go overboard and end up polishing the block to look like a new nickle.
 

8ad-f85

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What specific info are you looking for?
Do you have a performance goal in mind?
What are your plans with the induction in order to achieve those goals, talking head work, flow, power potential.
Understanding what the short block can handle or how it needs to be built is one aspect of this.
The other is how the top end is going to make this happen.
These don't need a special guy to come to fruition, just a very basic understanding of how engines work.
Just guessing that you are going for less than 500hp...this should be a walk in the park.
 

El Diablo

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What vehicle(s) do you drive?
1959 Cadillac Sedan deVille
I know it's been a while now but have you made any progress on the engine project?

I found a small cache of early to mid 50s Cadillacs in the LA area and if I can swing the deal, I will be building another early Cad myself again.

There is supposed to be a vintage speed shop in the SoCal area that has stuff for even the old flathead caddies, but I haven't found them yet.
 

El Diablo

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What vehicle(s) do you drive?
1959 Cadillac Sedan deVille
I know of 390 Cadillac engines but am unaware of 427 cid Caddys. Have I missed something?

bro. d

Probably meant 429.

Have you given any thought of building your own set?
 

55caddyguy

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Probably meant 429.

Have you given any thought of building your own set?
I have and actually hired a perfirmance sjop to build the header for the drivers side. Told me 3 weeks. I wanted ut to look stock. After 3.5 months he cancelled as he could not do it. I dont have the time to do it myself.
 

El Diablo

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What vehicle(s) do you drive?
1959 Cadillac Sedan deVille
I am just curious if you could use a set of V-6 headers from something like a Chevy 4.3 or Buick 3.8 & do a flange swap?

Maybe even a weld-up kit is available somewhere then do a flange swap?
 

Red98422

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Would the central exhaust tube provide enough volume to compensate for covering two cylinders? I’m by no means an expert but it seems that with two cylinders feeding the same tube even out of phase you would end up with a less than ideal situation, perhaps a bell reducer coupled with a tube slightly larger would reduce any ill effects. However that wouldn’t be as visually appealing at that point

ETA: you would also end up having to explain why you have 6 tubes and 8 cylinders
 
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