OLDS Harlard Sharp rockers clearance

[Cajun83HO]

Need opinion from experience.
Will Harlard Sharp rockers fit under OEM valve covers?
Will I need to modify valve covers?
Use 2 gaskets?
Wanting to build 455 with Edelbrock aluminum heads to fit in gbody with AC. I know it will be tight.

 

[olds307 and 403]

I believe baffles needed trimmed and double gaskets for full roller rocker arms. You can also fit them with Edelbrock/M/T valve covers with no baffles in place. Also expect to modify the A/C box. Of course just installing an Olds V8 in a G body usually does it by accident. Also expect a 2" drop base air filter with a BBO. A 350 stroker or 403 definitely fits better as the car was designed for the short deck, second gen Olds V8.

 

[fleming442]

I know you need short poly locks (.75"?). From there, I think you can dimple the baffles without completely removing them, and, as mentioned, double gaskets or a rail spacer.

 

[oldsofb]

I'm doing the same thing (87 442, 455 w/ A/C). I'm trying these to see if they work since they have the indents for A/C and Brake Booster on 67-72 Olds BB cars (got mine from this cool guy on here ☝️)
https://www.opgi.com/engines-compon...e-covers-zinc-1967-72-oldsmobile-c240690.html

Here's my height comparison between the older BB covers and a pair of 73-74 "Script" covers:

A/C Side indent

Even with the A/C indent they seem to stand taller than the script style. I think with the double thick gaskets it may work fine.

Here are my Rollers I'm using

Hope that helps some.

Hutch

 

[Tuffregal83]

Would these work

 

[fleming442]

Would these work View attachment 160047

I don't know if 3/8" will fit on a G, but that's them.

 

[Cajun83HO]

It's been a while since I've seen my covers . I have three pairs. Going dig them out. I think I have some olds script and ones with indents. The roller rockers I'm looking at are the 851-5001.

 

[Tuffregal83]

I ran these with my olds 455 when i was racing
But took out a/c box and ran hydo boost

 

[bracketchev1221]

Only way to know is to test fit them. Some aluminum heads have raised valve cover rails, so a stock cover may then fit even with roller rockers.

 

[Tuffregal83]

My 455 had Edelbrock aluminum heads 1.65 procomp roller rockers and the chrome Edelbrock valve covers did not fit rocker arms hit the baffle