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1.6 rocker arms

carolinafan4life63

carolinafan4life63

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just a quick question from a new guy!! is there any advantage or disadvantage to running 1.6 rocker arms on a stock 83 chevy 305 in a k5 blazer ......kinda curious motor runs good just has no guts...have heard that it will increase the lift and duration of the cam. any help and info would be greatly appreciated...thanks in advance.....john
 
It won't increase the duration any, but it will increase the lift. To run 1.6's on stock heads you need to slot the pushrod holes. To do this (correctly) you need to remove the heads. There is a special tool (Louis tool?) for the this. Basicly it's a guide that a drill bit rides in.

But, swapping from a 1.5 to a 1.6 is not going to make much, if any differance in the power. Atleast from what you'll be able to tell. I'd spend you're money on a decent intake or a set of headers. Plus that stuff will swap over to a 350 if (more likely when:D) you decided to go bigger. Not that the rockers won't swap over either.

Also, most cams are designed to be run with 1.5 rockers. Since that's what 90% of people run. Not saying that you can't use them with 1.6's. You could even run 1.5's on the intake and 1.6 on the exaust. Sort of a cheap dual pattern cam.
 
Not to contradict too much...

Depending on the head style you are correct. If you have self-alinging pushrods then you will need self aligning rockers, and vice-versa.


I put a set of 1.6 on my 350, i could hear a difference.

Think of it like this...If you have a 440 lift cam with 1.5 rockers, by adding 1.6 rockers the cam now has 469.3 "lift"...
 
sorry about the delay in replying to you answer, my father was in the hospital. so what intake and cam would you recommend.......i have a new weind 7546 single plane intake with the removeable divider plate. i know this intake is for the 1500 to 6000 rpm range and is too much intake for a stock 305 , therefore taking away from the bottom end power, would the plenum divider help at all?? the p o said it was a stock 305 with a mild towing cam and i have no info on the specs of the cam........any ideas for an intake -cam combo would be a big help!! and yes ....i will more than likely upgrade to a 350 later on ..but for now need a a little more from this dog of a 305 i have..thanks
 
The single plane would defently be to much for the 305. Maybe even with the divider in.

I've personaly always run Elelbrock's, Performers, Performer EPS (supposed to make more around 3500rpm), Perfomer RPM, Performer RPM Q-Jet and the Performer RPM Air Gap (when you have 5 vehicles with SBC's you get to sample allot of intakes:D).

The trucks (with the exception of the motor in my K5 now, it has an RPM AirGap) have always run the Performers or the EPS version. Don't have any complaints. But they start to run out of breath near 5000rpm. But most trucks don't spend that much time there anyways. Around town and towing they were just fine. If I were to buy one for a stock truck (305 or 350) again, I'd go for the Performer EPS. Maybe the RPM AirGap, if I planned on building a motor with a decent cam in it or a 383/400.

Maybe someone else will chime in with some of their experiances.
 
how about the weiand 8004 action plus intake? are they any good idle to 6000 rpm in the advertisement i read.....i also have access to one of those for little of nothing ?
 
I think the Action Plus would be a good choice.

For a cam, I've run Comp Cams Xtreme 4x4's in the last two truck motors I've built. The 254/262*(.447/.462" 1000-5200rpm), and the 262/270*(.462/.480" 1300-5600rpm).

The one with the 254/262 was a good running motor. Had the Performer EPS intake on it. I built it mainly for towing my snowmobiles and car trailer. Had a great idle and got decent gas mileage. It'd run out of breath around 4800+rpm though. But I think that's because I had a 600cfm carb on it. Made awesome power between 1700-3000rpm's.

The one with the 262/270 was in my Blazer just recently. You can tell this motor has an aftermarket cam in it from the idle. This motor had the RPM Air Gap on it. Pulls real strong from 1500 to well over 5000. For some reason this one is allot harder to stall at lower rpms (compared to the motor with the cam designed for lower rpms). I daily drove this motor for about 2 years without any problems. Had no trouble spining 40" Boggers in the mud (maybe the 4.88's had something to do with that though). If I were to build another motor for this truck, this is the cam I would use.

I've also heard real good things about Comps Xtreme Energy 262/270* (.462/.469" 1300-5600rpm). Supposed to be a good all around cam. I don't know, I've never used it. Although I have used the Xteme Energy 284/296*(.507/.510" 2300-6500rpm), and I'm very happy with it. So I'd be willing to bet that most the other grinds would work good as well.

I'm partial to Comp Cams, but have nothing against Crane, Lunati or Crower. Or even Summit or Jegs brand cams, most of the time these are just name brands re-packaged. The bigest issue is with the lifters. Cheaper one are made with lower quality materials, and they tend to wear down extremly fast. But as long as you stick to a name brand, I think you should be fine.
 
I second the second 4x4 cam(262/270), I have that in my 383, its a nice one. Pretty good idle, excellent torque.(could be the motor though:D)

Motor pulls strong from 1200-6300. (Rev-limiter) :D
 
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