318 Build suggestions
Ok, so to clear up the confusion. I have a seperate 318 core that is from 1973 that I plan to build.
I would like it to be streetable with the occasional weekend fun.
Its nothing that has to be done in a hurry so im not worried about costs. As mentioned above it would be smart to weigh out the costs of everything vs getting a stroker and making it a 390. Just would like to know what some good recommendations might be with stock heads, rods and pistons. And maybe what a good build would look like using a stroker kit.
I am not trying to build a 1/4 mile car, but maybe achieve 300 HP? Something reasonable out of a 318
You will spend more money building a hi-compression 318 short block, than you will on building a 360short block. The KB107s are cheap, and you do NOT have to machine the decks,(mine came in .012 below the uncut LA decks, which wotks well with an .028 gasket.). And that means you will NOT have to machine the intake either. And everything fits like it was meant to. Saving all this money on machining, means you can spend it on a 360LA short block core.
Or you can spend it on a 5.9Magnum and probably just re-ring it,
if that. Now you are saving the costs of boring and pistons.
And now you don't have to pump up the pressure; the 5.9M will make 300hp on it's 9.2 Scr or whatever it was. And I'm pretty sure it will do it with that Whiplash cam. And you will get your bottom-end torque back. And the Magnum heads will do everything the Whiplash can throw at it.
So with the 5.9M, And your performance parts off the current engine; you basically have everything you need, except an oilpan, and the basic rebuild kit;
IF you even need it. So now you can spend some extra coin on procuring a good tight 5.9Magnum.
The 318Whiplash (SMC1326AL) at .050 is
213/226/109+5 / .512/.550 lift with 1.6 arms.
Hughes does not tell us on the Website, what the advertised might be, but they suggest a
max Scr of 8.6 in iron heads, saying any more than that will require race gas. That points to some pretty robust cylinder pressure......
IMO;
To get the Thumping Sound, the overlap needs to be around 60*,
And to get at least the same VP as the stocker, which was 113 @800ft elevation, I chose an Ica of 56*,
Ok so plugging the numbers into the Wallace, She spits out the following;
266/286/109+5/124 compression/103 power/60 overlap/Ica of 56
IDK if that is accurate but its close enough.
Let's install that into a 5.9M @9.2Scr, and see what comes up...
I get;
Static compression ratio of
9.2:1.
Effective stroke is 2.97 inches.
Your dynamic compression ratio is
7.80:1
Your dynamic cranking pressure is
153.97 PSI.
Elevation 800, Ica of 56*, V/P of
141
Badaboom!
right on the money; put a posi in the back, rebalance the TC, put gas in the tank, install some bigger tires, and drive it like you stole it. Oh wait, that 600 is gonna be your starter-carb ,lol.
Now, if my guesswork is wrong in getting the 266/286; I think, and am pretty sure, but guessing none the less; it will only be wrong in the right direction; there is plenty of room in the Dcr for me to be wrong, and if I am, the new numbers will only make it stronger; and still in the realm of pumpgas.
I can't think of a cheaper way for
I would like it to be streetable with the occasional weekend fun.
But hey, if you really want to stick with a 318,you already know what to do.