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#1
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Speedmaster Pontiac Rocker Arms
Speedmaster now has roller rocker arms for Pontiac engines. Comments or thoughts on these?
https://speedmaster79.com/Pontiac-32...ocker-Arms-Set |
#2
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I didn't realize they made so many different parts!
The rockers look nice. |
#3
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I'm sticking with Harland-Sharps. I know they work.
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Just a blind squirrel looking for a nut. |
#4
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I know nothing about them. But surprised about spring loads only up to 360 pounds.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) ... or has a Pontiac born the same year as Jim Wangers? (1926} |
#5
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With a failure point of only 360 lb you can bet the farm that they are deflecting and giving up ratio well before a load of 360 lbs is reached!
Even as stout and fat bodyied as Harland Sharp rockers are they over ratioed by a bunch so that in use they average out at there stated ratio even when loaded to there max lb rating.
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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! |
#6
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Wow, those look weak. When they designed it they didn’t close in to top above the roller tip. 360 lbs, at least they appear to be honest, I would be nervous at 360. Lol
I would rather run a stock rocker than those My experience with Harlen Sharp and there customer service has been AWESOME. I run them when we can.. Prw are cheap and rated for 750 lbs. (I wouldn’t trust them past 400). ...A. couple years ago I bought some of there roller tipped 1.65s with 7/16 steel stock type on sale for $89, worked ok for a mild cam. https://www.enginelabs.com/engine-te...tips-included/ |
#7
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Highly stressed aluminum parts are over built thick cross sections because of flex and fatigue, and if you ask me and I know you didn't, these rockers are pushing the boundries of cross sectional strength which any fair minded person would conclude if the work great at first they won't be in the fight long
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If your not at the table you're on the menu A man who falls for everything stands for nothing. |
#8
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To date the only roller rockers we've not had issues with have been Harland Sharp, Crane Gold Race, and Crower Enduro's.
ALL of the others that were sent here with engines to build, or we've put in use have had issues with fit, durability, or completely failed someplace. There are certainly PLENTY of different offerings out there but when it comes to such important parts I'm staying as far away from anything with any "rice" associated with it as I can.....FWIW.......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
#9
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I personally don’t trust scorpion rockers I have worked on two engines with failed rockers (cracked). And the guy brought a box of scorpions he had taken off the year before with one broke in half “maybe you can make a good set with these” my answer NO we are putting HS on it.
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#10
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I've had the same set of Harland Sharpes in service since 2003 on 3 different engines and 3 different heads. I would sooner pay for a quality known part with excellent customer service then take a chance on a cheaper unknown part.
For all these new cheap parts out there..lets see a vendor show an example of customer who has used them in the real world...I want to see that guy with Speedmaster heads and these rollers put some miles on.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
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#11
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Even if they "some what" held up to what they are rated at...do you want to take a chance of having metal shavings circulating throughout your engine?
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#12
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Quote:
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#13
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I Have got to get me a dictionary for modern language/word meaning.
Examples: Withstands means failed And could happen is past tense for did happen Clay |
#14
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I've posted this before. Somewhat related, they mention deflection present in the body of the rocker arm.
https://www.hotrod.com/articles/hrdp...r-arm-comparo/ .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#15
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360 lbs. rating?? That won't even work with a decent hydraulic roller.
I'll keep using the Crowers. |
#16
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Speedmaster = junk.
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#17
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Daily Driver Model A Ford. 389 Pontiac w/6-71. 10.80 @129.5 1933, 1934, 1936 and 1940 Fords, also Pontiac powered. |
#18
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What was the prior name of the "Speedmaster" company before the name-change?
I'm thinking "Pro-Comp". Another lineup of junk. |
#19
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If these were named pro comp would you still buy them ? Ill stick to my Crower SS rockers
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Illinois Outlaw Gassers 6.27@107 9.97@131 |
#20
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I think that's exactly why they changed the company name--desperately trying to out-run a well-deserved reputation for selling nothing but crap.
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