John Goodman
Active Member
Getting closer.
Edelbrock Heads
- Thread starter hillperformance
- Start date
John Goodman
Active Member
PRW as is the aluminum water pump. Nice looking rockers with a lifetime warranty and fully rebuildable. Great price too.
John Goodman
Active Member
My springs at full lift are 360 lbs. so within rating for these rockers. Were your rockers aluminum or stainless steel? What was your open spring pressure? Also, at what RPM were you running when the rocker broke?
I have read mixed reviews about these rockers but most of the failures were for aluminum versions failing at the exact location yours did. Additionally, and I am definitely not saying you had this problem, but many engine builders do not set rockers up properly. It is time consuming and can be a little tricky so often just cursory attention is paid. But we will see how these rockers work out. My engine is built not to deliver much more performance over 6K RPM and it will rarely see that.
John
I also run 360 open and they were SS. The bearings failed on 4 of the 16 and 1 was a complete lockup and snapped the rocker stud off. A friend of mine owns a machine shop and said it looked like too much spring pressure. We looked up the max on their site and it seemed I was over the max by a little. I switched to Crower Aluminum rated for over 500. Just a FYI. Mine failed quite a distance from home and had to be towed home. My PRW rockers were made in China.
When I first bought them I didn't use them right away. When I went to use them 1 was defective when new. The replacement was slightly different. It's possible yours are an improved design. Just something to keep an I on. All my bad ones were on an exhaust. First sign of problems is pre-ignition from the valve not opening well enough. As they seize up the rocker flexes the stud and does not exhaust correctly.
John Goodman
Active Member
Thanks for the heads up, models916. This has me a little concerned now but one thing the manufacturer strongly urged was that after completely washing the rockers, soak them in oil before final assembly. I think this a good idea for any component using needle bearings relying on splash fed oil for lubrication. Like the non roller cam I am using, extra precausion is taken to minimise failure potential. I will keep the thread posted as to reliability. BTW, this car will likely not see much distance. I will be living in Wichita, Kansas when the car is finished. Not too many places to drive out there (LOL).
John
John Goodman
Active Member
I just installed a degreed SFI harmonic balancer but do not have a pointer on the block. Is there a bolt on pointer that works in this application?
TIA,
John
TIA,
John
Show-Cars sell stock bolt on or 10 degree offset for modern SBC damper on 348-409. Check with them on the correct part number. I think this is the one.
http://www.show-cars.com/cgi-bin/commerce.cgi?preadd=action&key=6687
http://www.show-cars.com/cgi-bin/commerce.cgi?preadd=action&key=6687
John Goodman
Active Member
John Goodman
Active Member
models916, I forgot to ask what total lift was on your cam (both intake and exhaust) when the PRW rockers broke?
John
John Goodman
Active Member
Not much different than mine only in hydraulic.
John E. Goodman
New Member
The adapter plate is finished, carbs are mounted and linkage has been worked out. The adapter plate also serves as linkage mount. The plate, carbs and linkage can be unbolted in one piece and mounted on another intake. I would like to try one of Bob Walla's new intakes when they are ready.
I hope to start the engine next month.
John
I hope to start the engine next month.
John
Skip FIx
Well Known Member
Pretty bad a$$ adapter! I always wondered if you could cut off the top of those 2" spacers(with a flange top and bottom) and slide the tops apart and reweld and get the Holleys end to end for 4160 styles, or adapt a tunnel ram top. Just noticed the quick change metering block too.
I do think that motor is begging for a bigger cam though!
I do think that motor is begging for a bigger cam though!
John E. Goodman
New Member
Hi Skip:
You are correct, this engine will take a much more potent cam but the exercise was to get as much street drivability as possible. Those 4150's will offer snappy throttle response at WOT from 2000 rpm without stumbling.
John
You are correct, this engine will take a much more potent cam but the exercise was to get as much street drivability as possible. Those 4150's will offer snappy throttle response at WOT from 2000 rpm without stumbling.
John
John, I wouldn't trust the balancer timing marks. Always check to see if TDC is really at the mark.
John E. Goodman
New Member
John Goodman
Active Member
Anyone interested in my 409 stroker build, I did an article for Engine Professional Magazine on this engine. It can be found at this link on page 50.
http://www.aera.org/ep/index.html
John