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#1
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Pushrod Valve Contact Pattern
Hey Everybody and happy Easter!
What do you think of this pattern and length of pushrod for a mild solid roller with 263 @ .050 and .631 lift with 1.5 rockers? Sorry sideways view. |
#2
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Sorry SAME valve SIDEWAYS
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#3
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Another valve
Sideways again. |
#4
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The sweep is oriented towards the outside or end of the valve away from the intake.
Wondered if a pushrod .050 shorter would center the pattern better? |
#5
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I think that looks pretty good. I was told by my machinist you want it past center like that. That's how I've done my 455 and the latest 400 I did.
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" Is wearing a helmet illegal" Mike Kerr 1-29-09 |
#6
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Looks decent. Some say at half lift it should be in the center of the valve
__________________
Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
#7
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Would be content with that as is
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#8
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I was told by a head guy that if the pattern is off center a bit, you want that offset to be on the intake side, not the exhaust manifold side. Hope that makes sense. There is a great video on here about push-rod pattern.
https://www.youtube.com/watch?v=o5is9BsH5OU
__________________
68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick. Best so far 9.95@134 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#9
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This is what you are looking for. If it's offset like Chuck's post describes and you're not looking to buy another set of pushrods I think you'd be fine with what you have.
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The Following 2 Users Say Thank You to PAUL K For This Useful Post: | ||
#10
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The offset is toward the exhaust.
I wonder if a .050 longer or shorter would center more towards the intake side. Also, could it narrow the Sweep? Thanks |
#11
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Get an adjustable pushrod from Summit. They're pretty cheap at around $20.. Then you can mess around with differing lengths and get your pattern centered and narrowed to your satisfaction
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#12
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If it's offset toward the exhaust, would lash caps help bring it back to center? It looks pretty close to me.
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#13
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What rocker arms are involved here?
They are not all the same geometry despite being called Pontiac I have a set of Comp ultra gold high end rockers that fit like socks on a rooster, I set them on the shelf and bought Harlan's that fit perfect, old school E'heads original valves I put those Comps on a #13 iron head with a RA-IV valves = much better fit with the valve tip closer to the stud
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If your not at the table you're on the menu A man who falls for everything stands for nothing. |
#14
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1.5 Harland Sharps e head
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#15
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The pattern should start on the intake side
__________________
Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
#16
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I used the Straub 1/2 lift method. It resulted in almost a 3/8 inch longer pushrod. It narrowed the trace considerably, but also moved the trace considerably towards the exhaust.
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Frank M. 75 Firebird 68 Firebird 400 RAIII 66 Chevy II 461 Pontiac in AZ |
#17
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Quote:
GT |
Reply |
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