318 hard parts suggestions

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acastro22

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Hello! I was wondering on build advice when it comes to a 318 I own.

I purchased a 360 intake and am looking for a 4 barrel carb (open to suggestions)

As far as parts I have two options for push rods
Stock length 7.5in vs shorter 7.380in
Which would be better for a camshaft with 285/285 duration .480/.480 lift

As well as the rocker arm set up. After everything between valves and springs should I keep stock style arms with the 1.5 ratio?
Or would a 1.6 ratio be better?

Lastly bearings are not listed but to be ordered. Rods will be reused with new pistons/rings/pins. Or is there a better rod suggestion
 
i'll start: what is your end goal. what are your expectations? what other hardware are you working with: car, trans (stall?), rear gears?

second question: why that cam?
 
You might want to figure your pushrod during assembly with an adjustable one. Get your geometry spot on. JMO
 
acastro22 said:
View attachment 1716349784
Hello! I was wondering on build advice when it comes to a 318 I own.

I purchased a 360 intake and am looking for a 4 barrel carb (open to suggestions)

As far as parts I have two options for push rods
Stock length 7.5in vs shorter 7.380in
Which would be better for a camshaft with 285/285 duration .480/.480 lift

As well as the rocker arm set up. After everything between valves and springs should I keep stock style arms with the 1.5 ratio?
Or would a 1.6 ratio be better?

Lastly bearings are not listed but to be ordered. Rods will be reused with new pistons/rings/pins. Or is there a better rod suggestion
Click to expand...
If you're going to use 318 heads, use a 1.94 valve
 
junkyardhero said:
i'll start: what is your end goal. what are your expectations? what other hardware are you working with: car, trans (stall?), rear gears?

second question: why that cam?
Click to expand...
Street car!

73 dodge d100
A727
And I have not gotten the ratio out of the diff yet.
 
A 318 with a 285 duration cam in a D100. Yeah. Do that.
 
acastro22 said:
Street car!

73 dodge d100
A727
And I have not gotten the ratio out of the diff yet.
Click to expand...
for a 318 motor in a 73 D you don't want none of that. the pistons, the cam, yuck.

it looks like you're trying to build a racy motor and i think you're just going to be disappointed in the result.
 
acastro22 said:
I do stock but I bought a 360 intake but I have not bought a carb and am open to suggestions
Click to expand...
stock intake or an aftermarket jobbie?

carter afb, avs, edelbrock avs 2 (650) would all be great choices. any of the smaller holley brawlers as well.

depending on the intake you may or may not need an adapter for those carbs.
 
and another dream shattered by the insensitive old line.

OP
how about telling us
what you already have under the hood, and
and why you don't like it, and
what stuff you have already bought, and

Also include the other statistics like;
transmission, rear gears, tire size, and current stall, if you can. and How heavy is the doggone truck.
Put everything on the same page so we don't have to go hunting.

The cam you chose, is advertised 45 degrees bigger than the stock LA 318 cam, that's about 6 sizes, which is right on the edge of being a race-cam. The operating rpm of such a cam is gonna be about 1000 rpm higher than stock cam, and it takes a good deal of bottom end away, forcing you to keep up with either;
1) a much higher stall, or
2) much higher rear gears, or
3) some combination of the two. AND
4) a significant increase in Cylinder pressure.
Those items alone will add very significant over-run costs to the project. And there's a good chance that if the 727 in not rebuilt asap, with performance parts, it will blow up. And for sure you will need a Sure-grip, and probably some anti-wheel-hop measures.
Were you anticipating that?

As to cylinder pressure, That cam wants a lot of Compression ratio, pressure that the stock heads even on a Zero-deckheight, cannot deliver, and even if they could, they would be a severe choke for a 285* cam.
So, pretty much, that 285 cam, demands some hi-flow heads with small chambers, and a static compression ratio of close to or over 11/1, with iron heads.
Were you anticipating that?

The same guys that shredded your dream, are however, the guys who can really help you; so be patient
 
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