TA

I'm currently in the process of final assembly on a new 383 for my 91. I'm at the point where I'm setting up my rockers. I had hopes that my old pushrods would work, but I obviously wanted to check the length to be sure. I did the marker on the top of the valve trick and the below picture is the result. The line is definitely a bit to the outside so the pushrods are a bit long, I believe. Is this enough to be concerned about? I don't have an adjustable length pushrod, but I'll order one if needed.

rklessdriver

Your about .050 too long.... maybe .100 depeding on how mch your lifter is collasping.

I'd suggest you get an adjustable pushrod and make sure of your geometry the right way. Otherwise why even bother to check it.
Will

96GS#007

Time to buy the adjustable pushrod so you can determine the correct length IMO.

TA

I kinda figured that was the case. So would I be safe to buy a set of 7.15" pushrods or is buying an adjustable pushrod to confirm it a better idea?

THE 383 admiral

the absolute best way purchase a push rod length checker.... mark the valve tips with a Permanent marker to and find dead center again... 7.192 is stock length... looks like you need shorter 7.100 - 7.185

TA

I know that you're right, I was just wishfully thinking someone would chime in tell me it would work fine.

Anyone have a good recommendation for an adjustable pushrod?

Caboboy

Yeah, this is too important........you can get something for 20 bucks or so and be confidant.

Caboboy

I just googled it & saw JEGS has one cheap. I bet you could find one locally too.

TA

I'll check around. I remember seeing one somewhere that each turn of adjustment was a certain length. That would probably make it a little easier for determining the length needed.

TA

Found it.

Comp Cams 7702-1 "Each complete revolution of the Comp Cams Pushrod Length Checker is equal to .050''

THE 383 admiral

on my CC 7702 1 revolution = .050

Kubs

http://www.summitracing.com/parts/CCA-7702-1/

What are you using for a lifter? You can either use the regular lifter and a light "checker spring" or make a solid lifter to use with your current springs.

Checker Spring
http://www.summitracing.com/parts/CCA-4758-2/

cv67

its fine






Get the tool and checker spring youll be glad you did.
Dont try and turn it over with those springs on liable to snap the tool
Minor inconvenience weve all been there.

TA

Well, since you said so


I ordered the adjustable pushrod and the checker spring.

engle1147

You've done the right thing.
There is nothing worse than having to order multiple sets of pushrods from a trial and error length guess(es) or just because your measurement was "off" a bit....@ ~$80 a set these things can add up real quick.

To avoid further confusion -you may even want to buy, borrow or steal a caliper(see below) to determine your final pushrod length instead of counting the number of .050" turns from colapsed. Use the adjustable pushrod tool to get the "length" your after then use the caliper to measure the adjusted "length" of the pushrod tool.

http://www.harborfreight.com/24-inch...per-96509.html

http://www.harborfreight.com/8-inch-...per-47260.html

Nathan Plemons

FWIW I'm running stock pushrod length on my car. The heads have been milled slightly, the valves have been replaced, seats re-worked, the head gaskets are different, and I'm even running 1.7 rockers. There is no way that my geometry just happens to be perfect but it's been running strong that way for a buttload of hard driven miles.

I'm a good deal older and wiser now, so if I had it to do over again I'd probably check them and get the "proper" length. Since you've already checked and know that it's wrong, might as well follow through and get exactly what you need. Being said, you could probably run them just the way they are and never have a problem. Maybe roller rockers may just be a lot more forgiving in this regard than non rollers.

TA

I should have the adjustable pushrod today. Any recommendations on pushrods once I determine the proper length? I'm using CC Pro Magnum self aligning rockers if that matters.

cv67

a good brand name. 080 thick ome piece. stay away from tjhe ones woth swesges tips or the ***** on the end

cv67

a good brand name. 080 thick one piece. stay away from the ones with swedges tips or the ***** on the end

Nathan Plemons

I've been very happy with the single piece trick flow rods.