SBC Pushrod lenght advice needed... - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-08-2008, 09:29 PM
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SBC Pushrod lenght advice needed...

I'm currently reassembling my 355, and recheck everything in the same time. This time i'm using roller rockers, and I haven't checked pushrod lenght the first time i've assembled the motor. I read a few articles about valvetrain geometry, so that's why I wan't it corrected. I have a Lunati Bracket Master II cam in it with 300/300 .515/.515 specs. When I checked the roller on the valve tip, it seems that the pushrod is a little on the short side, since I don't have any pushrod lenght checking tools, I'm wondering if just getting 0.100 longer pushrod do the job. I know it's a wild guess, but when I check in parts catalogs, I always see the 0.100 longer pushrod as a second choice besides the originals.

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Old 02-09-2008, 06:42 AM
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The tool you need to check the length is very inexpensive. Manley 42137 is 20 bucks or less. Good luck with the project
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Old 02-09-2008, 10:47 AM
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just buy one pushrod thats standard length and one thats .100 longer probably cost you maybe $5 dollars each if you get a sealed power or elgin one than buy the rest of the set when you know which is right

i think the sealed power numbers are rp3212r for standard and rp3212r100 form +.100
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Old 02-09-2008, 12:08 PM
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checkers

You can buy a checker from jegs or summit for about 10 bucks.The geometry is something that you need to get right.You can also buy pushrods from trend.The make them any length you want in like 10 thousand increments.
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Old 02-09-2008, 04:59 PM
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You can make your own checker by taking an old push rod and cutting it in two (and taking out about 3/8") and center drilling the ends so you can tap each end. Screw a short stud into one end and place a jam nut on the stud and screw the other end of the pushrod onto the stud, giving you the capability of infinite adjustments. You will need a wide jaw micrometer to get a precise measurement. You could probably get close enough by starting with a known length push rod and lay the checker beside it and use a feeler gage to measure the difference. It's cheaper in the long run to buy one if you value your time.

Trees
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Old 02-09-2008, 05:43 PM
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Quote:
Originally Posted by trees
You can make your own checker by taking an old push rod and cutting it in two (and taking out about 3/8") and center drilling the ends so you can tap each end. Screw a short stud into one end and place a jam nut on the stud and screw the other end of the pushrod onto the stud, giving you the capability of infinite adjustments. You will need a wide jaw micrometer to get a precise measurement. You could probably get close enough by starting with a known length push rod and lay the checker beside it and use a feeler gage to measure the difference. It's cheaper in the long run to buy one if you value your time.

Trees
You ever try to drill and tap a stock GM pushrod. Or even cut on with a hacksaw?

tom
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Old 02-11-2008, 10:14 AM
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re: SBC Pushrod lenght advice needed...

Quote:
Originally Posted by machine shop tom
You ever try to drill and tap a stock GM pushrod. Or even cut on with a hacksaw?

tom
That's a very tough steel. Heat it up with a torch till it glows red where you want to cut it and let it cool slowly. After that, it cut, drilled and threaded easy.
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Old 02-11-2008, 01:07 PM
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I like the little plastic height checker that goes on the stud. On a recent set of heads I was getting crazy results with an adjustable pushrod - the plastic piece clearly showed the studs had been machined and installed at the wrong angle Bad thing to find out, but it made sense.

Agree with the others - the plastic checker is about $15 and an adjustable pushrod is about $15 - that is money well spent.
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Old 02-11-2008, 01:46 PM
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Quote:
Originally Posted by hyarbour
That's a very tough steel. Heat it up with a torch till it glows red where you want to cut it and let it cool slowly. After that, it cut, drilled and threaded easy.
Thanks, I'll give it a try. Got a lot of uses for all those scrap pushrods laying around........

tom
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Old 02-12-2008, 04:43 AM
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Ok, i got a +0.100 pushrod and it's no good, it seems it's a -0.100 pushrod that I actually need. I fing this funny, longer pushrods are everywhere, shorter are quite harder to find. The stock lenght places the roller right on the middle of the valve stem at no lift at all, then the roller goes all the way towards the exhaust side at full lift.
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Old 02-15-2008, 09:02 PM
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Whatever your pushrod needs, call these guys;
Trend Performance
Quote:
STANDARD FEATURES:
* Large Inventory Stock
* 6.00"-13.00" Lengths available in 0.025" increments
* 5/16" & 3/8" diameter available in 0.080" wall thickness
* 7/16" diameter available in 0.080", 0.12": & 0.165" wall thickness
* One-piece construction
Die formed ends
* SAE 4130 seamless tubing
Center ground
* Case hardened to Rc 60
Black oxide finish
* Laser etched length

OPTIONAL FEATURES:
* 210� clearance radius ends available


Trend Performance, Inc.
23444 Schoenherr
Warren, MI 48089

Toll Free: 1.800.326.8368
Tel: 586.447.0400
Fax: 586.447.0440

Email: info@trendperform.com


I have never worked for, nor accepted payment from, any parts manufacturer or supplier. I am not an advertising agent or compensated promoter of any product, service, or entity.

Last edited by Stroke; 02-15-2008 at 09:09 PM.
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Old 02-16-2008, 12:59 AM
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trend

Stroke I just bought some pushrods from trend for my 468 bbc.They where .080 wall and looked pretty good to me.I paid 96 dollars for them.I had a +.150 and +.300 long for mine.I havent run the engine yet but Im pretty happy with their service and prices..
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Old 02-16-2008, 01:00 PM
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From the Knowledge Base on this site, How to check geometry
http://www.compcams.com/information/Products/Pushrods/
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