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#21
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Thanks Pastry, I just edited my post above (#19) while you were posting a reply, just incase you missed it
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1978 Trans Am Pump Gas 461 Stroker |
#22
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We will do the full sweep with the 9.150" and report back in just a few minutes
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1978 Trans Am Pump Gas 461 Stroker |
#23
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Ok, here is full sweep with the 9.150" pushrod and 1 full turn of the engine. Lifter at zero lash.
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1978 Trans Am Pump Gas 461 Stroker |
#24
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Post 23 looks like about as good as you'll get.
Edit.. maybe 9.2 is better,, looks more narrow IMO. Last edited by pastry_chef; 06-27-2021 at 10:14 PM. |
The Following User Says Thank You to pastry_chef For This Useful Post: | ||
#25
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Here is the witness marks, one on the base circle, one at 2/3 lift, both with the lifter at Zero Lash, at 9.150".
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1978 Trans Am Pump Gas 461 Stroker |
#26
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I was thinking by the time a person preloads the lifter .050" or so, the 9.200" may end up being the best, although the witness mark on the 9.150 is pretty centered, but that is WITHOUT any lifter preload too. I am by far not an expert though, that's why I need help LOL
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1978 Trans Am Pump Gas 461 Stroker |
#27
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Are your factory rockers new or used and can you post up a pic of the contact face on them.
Would be interested to see the diff in radius of the contact area on the stamped rocker, Vs the radius of a common roller tip rocker
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Working on going faster (and now staying dry at the same time !!) |
#28
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We are checking with the factory rockers, but they are in excellent condition. We will be using New Comp Cams replacement 1251-16 though, which are exact specification as the stock rocker that we are measuring with. We are still awaiting delivery of the new rockers, so we are measuring with the stock rocker, but since they are identical specs, there should be no difference between the two as far as pushrod length. I don't have any pictures of the stamped rocker contact face at this time, but I can get a picture this evening.
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1978 Trans Am Pump Gas 461 Stroker |
#29
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I would wait till new rockers are in hand the new face at the tip might make pushrod checking easier due to a new surface
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The Following User Says Thank You to Formulas For This Useful Post: | ||
#30
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Quote:
I'd also wait for the new rockers. |
The Following User Says Thank You to pastry_chef For This Useful Post: | ||
#31
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Quote:
ALL rocker ratios vary slightly from manufacturer to manufacturer and style to style. Since you are going to all this trouble to get an optimum-length pushrod, make certain that it is optimum with your NEW rockers. |
The Following User Says Thank You to Joe's Garage For This Useful Post: | ||
#32
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Thanks guys!, as far as what I have measured so far(with the current stock rockers), what length do you guys favor the most? I was leaning towards the 9.200" by the time a person figures in .050" or so of lifter Preload. We will definitely check it with the new rockers when we get them.
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1978 Trans Am Pump Gas 461 Stroker |
#33
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I vote for the 9.200”.
While you have some time it would be interesting to cycle thru all of those stock rockers on that one valve just to see how much the ratio veries.
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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! |
The Following User Says Thank You to steve25 For This Useful Post: | ||
#34
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Ok guys, we got the new rockers today, and remeasured using the adjustable pushrod at 9.200". To me, the witness marks look even better with the new rockers, and I think the 9.200" is the winner. One mark is on the basecircle, the other is at 2/3 lift, both with the lifter at ZERO lash. By the time a person figures in .050" of lash, I think the 9.200" will be as close as we can get. We also measured with it at 9.150" appreas to be a little too short.
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1978 Trans Am Pump Gas 461 Stroker |
#35
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Looks good.
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The Following User Says Thank You to pastry_chef For This Useful Post: | ||
#36
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Thanks! I'm gonna go ahead and place my order at Butlers for the 9.200" .116" wall. I appreciate all of your help very much.
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1978 Trans Am Pump Gas 461 Stroker |
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