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-   -   LS rockers (http://www.ifsja.org/forums/vb/showthread.php?t=187030)

jcisworthy 04-28-2019 05:23 PM

Quote:

Originally Posted by babywag
So I cannot find my adjustable pushrod...:banghead:

Doing the math 18 tpi is .056 @ 1 full rotation?
Which means to obtain .020-.030 = ~1/2turn(.028) after zero lash?


Correct

pickledtoast 04-29-2019 06:23 AM

Yes, your math is correct.

LS1 rocker puts the pushrod seat .040" lower than the AMC rocker from my '90. The AMC rocker ratio measured 1.605, LS rocker 1.715. That's just straight measuring the rocker, not the actual valve lift vs lobe lift measured with a test spring (my engine is still in pieces).

I'm going with the summit K8600 camshaft kit which as .080 smaller base circle on exhaust, .050 on the intake. So I may be able to reuse the factory pushrods on the exhaust and compress the lifter .015 more on the intake.

But the heads, deck were touched, different brand lifters, who knows how the head gasket thickness matches the oem, so I'll find out when I assemble.

JeepsAndGuns 07-14-2019 06:31 AM

Curious if anything came of this, or has the project been shelved?

pickledtoast 07-15-2019 11:54 AM

My engine is together with the factory rockers and pushrods, just changed the oil after break-in. I'll get to swapping in the LS rockers eventually.

babywag 07-24-2019 07:57 PM

I have a ton of stuff higher on my list but I will get to it eventually.

yossarian19 10-13-2019 04:43 PM

Any update?

babywag 10-15-2019 10:01 AM

Quote:

Originally Posted by yossarian19
Any update?


Nope...still pretty low on my list.

Chevelleguy 10-15-2019 11:25 AM

I am beginning the engine rebuild process and am going to dive into this too. Ordered a set of Procomp stainless, adjustable LS rockers in a 1.8 ratio to try. The adjustable pushrod seat should fix any minor pushrod issues. I will let you know how it looks after I get the heads back from the machine shop. I got them cheaper than this, but these are the same ones.

https://www.summitracing.com/parts/s...1118?rrec=true

Ristow 10-16-2019 09:49 AM

1.8,wow you want good valve springs they are gonna open and close fast.

Chevelleguy 10-17-2019 07:01 AM

Quote:

Originally Posted by Ristow
1.8,wow you want good valve springs they are gonna open and close fast.



I got a complete Comp 268H cam kit. 1.8 will put the valve lift at .513, which is only another .057". I got these for less than it would have cost me to replace them with factory rockers so if they work out it's a win. If they don't work I can probably sell them to someone at work. We have a lot of LS guys here.

Chevelleguy 10-24-2019 10:14 AM

Well preliminary fitment looks good. Just bolted them on a head, no cam. The roller tip is in the very center of the valve stem and the spacing is correct. Won't know until I get the motor assembled if I will need custom push rods or if shimming of the pedestal will be necessary.

rang-a-stang 10-24-2019 11:01 AM


jcisworthy 05-17-2020 06:21 AM

LS Rockers on bridge heads
 
Found a couple pictures of LS rockers on a 401 I built for a customer. I have a 360 going on the dyno, should be this week, using LS rockers after the break in with factory bridge 1.6 rockers.

I may make a pull with the bridge to compare with the 1.7 LS

http://theamcforum.com/forum/topic10...88.html#927388

JeepsAndGuns 05-17-2020 06:24 AM

Quote:

Originally Posted by jcisworthy
Found a couple pictures of LS rockers on a 401 I built for a customer. I have a 360 going on the dyno, should be this week, using LS rockers after the break in with factory bridge 1.6 rockers.

I may make a pull with the bridge to compare with the 1.7 LS

http://theamcforum.com/forum/topic10...88.html#927388


Yes please do. I would love to see a actual dyno run with stock rockers and these rockers on the same engine. Would be very interested in seeing where and how much difference they make.

jcisworthy 05-17-2020 09:52 AM

The engine is a 360 with 10:1 CR, street ported heads around 260 CFM at the lift of the cam with the 1.7's. Port matched Air gap intake, hydraulic flat tappet Bullet custom grind, 214/226 @ .050, 114/110 LSA/ICL, .544/.577 lift with 1.7's.

Jeep Headman headers 1 3/4" x 2.5" collector headers.

Engine is going in a CJ

pickledtoast 05-18-2020 10:41 AM

Yeah, please do a back to back test on the dyno if you could. I hoped to do that but am getting grief here at work putting my AMC on the dyno, as we don't have the AMC adapters for the dyno.

If I recall correctly, the GM pedestal stands don't put the pivot in a good height for the pattern. I had to make my own stands. At least I think that's why I made my own stands.

pickledtoast 05-18-2020 11:22 AM

Test here for uploading pics:
https://thumbnails-photos.amazon.com...A23O6GJEQP2OWG

https://thumbnails-photos.amazon.com...A23O6GJEQP2OWG


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