Roller Rockers and Valve Covers

[7t500]

I am hoping some of you can help me by sharing some recommendations on valve covers for aftermarket rockers and distributors.

Details:
Mopar 400 with 470 stroker kit
906 heads
New Mancini Racing 1.6 roller rockers
Pertronix flamethrower III distributor.
Aftermarket 70/80's era Weiand valve covers

The problem I have is that the new rockers at max lift are ever so slightly contacting the intake side wall of the valve covers. Now I would love a set of black fabricated covers but have concerns about running into the same issue I have now... on top of all of this, I have a Pertronix billet distributor that I already had to clearance the valve cover lip for and have heard other have clearance issues with a billet distributor and the fabricated valve covers.

I could certainly take some material out of the valve covers to get the clearance needed but man oh man would I love some fabricated covers to match the CVF alternator and belt setup I've got...

Thanks in advance!

 

[Mike67]

You can buy spacers 1/4, 3/8 & 1/2"

 

[7t500]

You can buy spacers 1/4, 3/8 & 1/2"

I dont know if that will help with my rockers and the clearance with the side wall... it's possible though... have you used it with success before?

 

[beanhead]

I am hoping some of you can help me by sharing some recommendations on valve covers for aftermarket rockers and distributors.

Details:
Mopar 400 with 470 stroker kit
906 heads
New Mancini Racing 1.6 roller rockers
Pertronix flamethrower III distributor.
Aftermarket 70/80's era Weiand valve covers

The problem I have is that the new rockers at max lift are ever so slightly contacting the intake side wall of the valve covers. Now I would love a set of black fabricated covers but have concerns about running into the same issue I have now... on top of all of this, I have a Pertronix billet distributor that I already had to clearance the valve cover lip for and have heard other have clearance issues with a billet distributor and the fabricated valve covers.

I could certainly take some material out of the valve covers to get the clearance needed but man oh man would I love some fabricated covers to match the CVF alternator and belt setup I've got...

Thanks in advance!

I use the fabbed covers from 440source. I have the 1.5 Mancini/HS rockers but there's plenty of clearance for the higher ratio arms. I also use the blue Moroso gaskets, which add a little extra room too. No issues with my distributor fitment, but the covers come with no holes or baffles. No problem for me though I made my own holes where/how big I needed and a 'baffled' grommet is doing fine keeping oil out of the PCV.

 

[7t500]

I saw those but the lack of a baffled breather hole and have concerns with distributor clearance since I'm running a larger than stock distributor... how much clearance do you have between distributor and valve cover? Is it a B or RB?

 

[beanhead]

I saw those but the lack of a baffled breather hole and have concerns with distributor clearance since I'm running a larger than stock distributor... how much clearance do you have between distributor and valve cover? Is it a B or RB?

Big block. At least 3/8" between cap and valve cover. (It's actually tighter between the head and the distributor).

 

[Mike67]

I dont know if that will help with my rockers and the clearance with the side wall... it's possible though... have you used it with success before?

i have not, i thought they wre tapping the roof. Sorry!

 

[7t500]

i have not, i thought they wre tapping the roof. Sorry!

No need to apologize, that seems to be the more common issue!

 

[wyrmrider]

Go to B3Racing industries and read all 4 tech articles
then call him and ask if this a geometry problem

 

[coloradodave]

I purchased cast aluminum valve covers from Marsh Performance. They clear my 1.6 roller rockers easily. They came with baffled holes for a breather and PCV grommet. I drilled another hole for a screw on oil fill port. They come polished but I elected to paint mine. Very good quality and affordable. I use the Moroso gaskets as well. No leaks.[email protected] Todd Marsh

 

[7t500]

As a follow-up, I went with the Mr Gasket fabricated valve covers. They clear the rockers easily, clear the Pertronix distributor, and look great. Link below for those that may be interested and in the same boat as me.

https://www.holley.com/products/acc.../big_block_chrysler_valve_covers/parts/6865BG

 

[BSB67]

Man, those look really nice.

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