1.6 rockers with stock 318 cam??

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'teen machine

'teen machine

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I have a '75 318 with an Edelbrock torker, a 570 vac secondary Holley and dual exhaust. I want more low end torque, (don't care about power over 4000 rpm) I'm thinking of upgrading to a Weiand dual plane or LD4B eddy. I don't really want to swap the cam, will putting 1.6 roller rockers make a noticeable improvement in torque while retaining the stock cam?

And please don't suggest swapping in a 360 LOL
 
i would spend that money on upgrading the ignition

dont think you will see anything with 1.6 roller rockers on a stock 318 cam.....but
 
70aarcuda said:
i would spend that money on upgrading the ignition

dont think you will see anything with 1.6 roller rockers on a stock 318 cam.....but
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I agree, I don't think with 1.6 rockers you will gain any bottom end, if anything it will add a small amount of hp, but the stock cam is so weak I doubt it would be much.

Spend the money elsewhere. Good long tube headers might add a little bottom end... Igntion will give a better throttle response, more crisp, but I doubt will add any more torque. The stock 318 is mostly built for low end so improving it can be pretty challenging.

A good intake will go a long way, IMO the LD4B is a little more HP oriented than what you are going for, I have one and the runners seem pretty big for a 318. I have a Offy dual port and have run it and that thing is torque monster and good to ~5500. Don't know anything about the Weiand, other than looked into it and bought a LD4B... haha
 
Bang for the buck wise, I'd say this would be pretty near the bottom of the list. You wouldn't gain much power, but would probably overwhelm the stock springs. Standard mods like a small runner dual plane and a good exhaust system will provide more.

If you still have the stock cam, does that mean you still have the stock cam sprocket and timing chain?!? (TIME BOMB) The plastic tipped sprockets were nice and quiet, but they get brittle in time. Unfortunately when they fail, the engine gets really quiet all at once.

For the cost of a set of quality 1.6 rockers, you could buy an XE262 cam, a used performer intake, perhaps a set of common 1 5/8" headers, and a new timing set.
 
I agree so far too. If you could wave a magic wand and change the duration and lobe separation on that stock cam, THAT would make a difference. But the 1.6 rockers I don't think you'd ever notice.
 
Thanks guys! Would I be able to notice the improvement of an rv cam without 1.6 rockers? Offy dual ports are a li'l hard to come by aren't they? I should be able to notice a difference in low end by switching from the torker to a good dual plane shouldn't I?
 
If you're running a Torker on a stock 318, YES any dual plane will help (skip the SP2P). A regular Performer is what you want.
 
That Eddy torker is a hunk of junk IMO. Put a performer on it and it'll gain a bunch of torque. My Cuda had a torker on it when I bought it and I swapped on an Air-gap and it made a huge difference in low end torque. As for the 1.6 rockers, I agree with the others. I took the time when I was building my 408 to measure the effect of 1.6 rockers and saw a 3-4 degree at .050 gain and .033" lift gain. You'd gain a little switching to the RV cam but is your engine in real good condition? If it's not slapping in a bigger cam isn't a good idea.
 
I'm with everybody here on the rocker ratio issue. Skip it.

The SP2P intake is a mileage maker. Skip it.

Look for the;
LD4B (old Edelbrock intake/square bore carb pad)
Edelbrocks Performer
Weiand's Action Plus

The cam doesn't need 1.6 rockers for a noticeable improvement. The power gain comes nearly directly from the extra duration. A small rise in lift is there to take advantage of the cylinder head flow available. Once you go beyond .450/.460 lift, the head could use (Not a must) some valve work or if a greater lift is used, some bowl work in addition. (Porting under the valve.)
 
OK, IMO Weiand's action + looks allot better than Eddy's performer.(I know looks aren't the basis for choosing a manifold) Everybody seems to have their own opinion as to which manifold is better. From what I read the action + is a better all round intake but seeing I don't need power above 4,000 rpm which intake makes the best low low end grunt? Or is there enough difference between the two to even compare?

My stock 2 barrel performed about the same with a burnt exhaust valve(40 psi compression on the one cylinder) as the torker and 570 holley with a fresh valve job! lol
 
Well, both intakes are very good units. This particular Weiand I like a lot. IF there is a difference between them, I would have to see a dyno result to believe there is much of anything between them.

A lot also depends on the power level and parts being used on and inside the engine.
 
rumblefish360 said:
Well, both intakes are very good units. This particular Weiand I like a lot. IF there is a difference between them, I would have to see a dyno result to believe there is much of anything between them.

A lot also depends on the power level and parts being used on and inside the engine.
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Well, as for the innards of the engine it's stock compression, basically stock closed chamber heads, and I'm thinking of installing an rv cam and roller timing set, and long tube headers.
 
That dear sir is actually smaller than a stock 318 cam in duration.

What do you want the engine/car to do for you?

Mileage
Power
 
I'm sorry I should have specified duration was being measured at 0.50" not advertised.
The particular cam I mentioned has 270 int 280 exh advertised duration.... a fair amount more than stock.

I'm looking for lots of low end torque between idle and 4000 rpm
 
Salty Dog said:
I assumed the numbers were at .050 and I still stand by what I said,
(Intake duration at least at this point)
"THAT CAM IS SMALLER THAN A STOCK 318 CAM."

The duration numbers advertised just sold me on a cam that has a lazy lifter rate and is basically garbage.

Better;
http://www.compperformancegroupstor...Product_Code=20-208-2&Category_Code=LACAMHFHE

Even better;
http://www.lunatipower.com/Product.aspx?id=2340&gid=297
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I see your point but you can't go by advertised duration.

So, what do you think a 318 cam has for duration?
 
You missed what I was thinking, I think, it is a advertised duration vs. duration @ .050 to help give an idea of rate of lift between the 2 numbers vs. other cams. A quicker rise will lend itself for more power. It should also be know where the cam grinder/factory rates the advertised duration. At what lifter rise do they take measurements from.
 
That's good as long as all cam manufacturers use the same measurement for advertised duration.

BTW i'm pretty sure the cam I listed has at least 10-20 degrees more duration than stock 318....
 
10-20 degrees more duration than stock 318....
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LOL-ROFLMAO

OK, believe what you think, it's OK, I'm so glad I could give away some of my 30+ years of working on making engines go fast and such.

Have at it and fun. Almost nice talking to ya.
 
Increasing the compression would be one method of getting more torque without putting in more cam. Mill the heads!
 
'teen machine said:
about a 204° int 214° ex .420" int lift .472" ex lift
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Salty Dog said:
That dear sir is actually smaller than a stock 318 cam in duration.

What do you want the engine/car to do for you?

Mileage
Power
Click to expand...

If your referring to duration at .050" lift I'm sorry but I have to disagree that that cam is smaller than a stock 318 LA cam. All stock 318 LA cams I've seen were in the neighborhood of 390 degrees at .050 and less than .400 lift.
 
All stock 318 LA cams I've seen were in the neighborhood of 390 degrees at .050 and less than .400 lift.
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Dear sir, please re-check your post, duration @ 050 reading 390 wuold be larger than this race cam listed below;

http://www.summitracing.com/parts/LUN-504A4LUN/

Something is a miss here. It aint me!

Lift, yes, I agree. Duration, ... NO. That cam he liosted is a small lazy cam.
 
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