Has anyone has their rockers hit the sides of their valve covers?
01-11-2023, 12:21 PM
#21
Melting Slicks
I see them on Amazon now for $99 and if you get them there, you can always return them for free if they don't fit, given that they're a Prime item.
They clear my 7/16" rocker studs, comp ultra pro magnum 1.6 rockers, and my CS144 alternator fits. (Not clear yet on whether the hood clearance is acceptable, but I'm hopeful.)
I do use a extra thick valve cover gasket and heads with a raised valve cover rail, though. (The valve covers just BARELY come off and on. Any taller would be more problematic.)
Adam
01-11-2023, 12:33 PM
#22
Melting Slicks
ALMOST all SBC rockers have much higher max open pressure ratings than a hyd roller tappet could deal with. There's only a few that have low open pressure ratings: Crane die-cast Energeizer rockers: 450 lbs; Comp Cams Hi Energy die-case 350 lbs; Comp Cams Red and Ultra Gold 400 lbs. Proform claims their 306 aluminum HD rockers can support 700 lbs of open pressure, so color me skeptical...
There's a FANTASTIC comparison chart of SBC 1.6 ratio roller rockers in this article in the table if you expand it out. The prices are way out of date, but otherwise still a pretty good chart.https://www.motortrend.com/how-to/hr...r-arm-comparo/
I turned the table from the article into an XLS and the XLS into an image here
On a related slightly musical note: I like big (rocker) trunions, and I cannot lie!
You can see from the chart why so many people with serious solid roller cams who want to run stud-based rockers and have good longevity pay for the Crower Stainless rockers; statistically they are in a category of their own (except the width of the tip's roller wheel, which is maybe some kind of moment-of-inertia enhancement?).
Adam
Last edited by NewbVetteGuy; 01-11-2023 at 12:41 PM.
05-17-2024, 11:09 PM
#23
1st Gear
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Sooo, started my new engine up for the second time today and heard weird clicking sound. Turns out my Howard’s aluminum roller rockers are hitting the sides of valve covers. Always thought height was the issue not the width… If you look at the valve cover over the #2 cylinder, you’ll see wall is slightly distorted. Whelp, my 383 is going to get some wide valve covers now…
I call this 383 project cheep skate.
eBay aluminum heads - $650 complete - bought bare and assembled heads myself.
Eagle 383 stroker kit $765 - Bought before COVID mark-up
350 Vortec 880 block - free (did some horse trading)
Melling roller cam $175
Accel billet aluminum distributor $48 - (Holley scratch and dent - but didn’t have either)
Here’s a sneak peak. Still needs work, such as distributor cap, electric fuel pump hook up and connect trans linkage.
I call this 383 project cheep skate.
eBay aluminum heads - $650 complete - bought bare and assembled heads myself.
Eagle 383 stroker kit $765 - Bought before COVID mark-up
350 Vortec 880 block - free (did some horse trading)
Melling roller cam $175
Accel billet aluminum distributor $48 - (Holley scratch and dent - but didn’t have either)
Here’s a sneak peak. Still needs work, such as distributor cap, electric fuel pump hook up and connect trans linkage.
The following 2 users liked this post by augiedoggy:
HeadsU.P. (05-18-2024),
speedreed8 (05-18-2024)