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#101
03-05-2021, 06:01 PM
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Regarding the information on the pkelley website concerning the valve timing overlap ranges that are most likely to work correctly linked in post 82.
One might question if those numbers suggested by David Vizard are significant for his work typically on a small block Chevy application. Another tid bit.... How Much Valvespring Coil-Bind Clearance Is Safe? https://www.hotrod.com/articles/how-...rance-is-safe/ .
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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 |
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#102
03-05-2021, 08:45 PM
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Maybe the simplest answer can be from looking at Edelbrock and their heads. Do you want hydraulic flat tappet springs or hydraulic roller springs? They all come with the same length valves and springs. Probably not that big of thing since smaller duration's and lower lifts treat the spring pretty gentle and the smaller the cam the lower the RPM the valve train is going to see.
The guys that get up in the .750+ inch lift at 8,000+ RPM need to be concerned with such things, but I personally feel that .600" and under lift staying at or under 6,000 RPM the harmonics really shouldn't be of concern.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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#103
03-05-2021, 11:10 PM
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Quote:
I agree |
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#104
03-06-2021, 09:59 AM
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As a fwiw, Paul Carter has done extensive dyno testing of many combinations using Voodoo cams and his suggestion was to keep the distance from coil bind under 0.100" on Voodoo lobes.
To me it seems a bit silly but I've seen some run a factory cam 0.282" away with the popular Crower 68404 spring ! .
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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 Last edited by Steve C.; 03-06-2021 at 10:07 AM. |
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#105
03-06-2021, 01:59 PM
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Quote:
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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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#106
03-06-2021, 03:26 PM
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0.240", that said I doubt it was installed at 1.600" as claimed in the catalog.
Doesn't matter, still silly ! .
__________________
'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 |
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