Technical Corvette valve covers dont fit

My guess, those didn't make Q/C at the foundry. Someone dumpster-dove with a "we can make 'em work" intention (wallowed hole evidence). When that didn't work out, instant swap-meet fodder. They may end up as damn pretty wall hangers.

 

No weld on it from what i can see inside abd the lenght is right.... Just looks to long in picture

 

I figure if i cant use them i cant sell tgem knowing that they dont fit BBC so wall hangers or maybe a table lap since the lanps online with corvette valvecovers go for 600

 

I bet you could make them fit, if you really wanted to.

 

I still think if they where a bad casting they would be more of them out there. But who knows

 

Been watching this!

 

could be the casting was ok, and it was machined wrong?

 

Hecho in Mexico, drill press operator error.
Maybe too many Dos Equis for lunch.
@55vicky
Until we come up with a definitive answer; we can at least have a good laugh about it.
I kinda doubt this is gonna hold up your project either way.
Might as well enjoy the ride.

 

Could you make a valve cover "spacer" adapter? Select the metal thickness you need and have it water jet cut with 2 sets of holes. One set for the heads and the other for the valve cover to screw into..

 

My guess is maybe they f*cked up when they drilled the holes??? I kinda agree with Jim, in that if you tigged up ALL the holes and re-drilled them, there might be enough meat there, but I really gotta wonder if its worth all the h***le. Depends on how much you payed for them and how bad you want them I guess.

 

Could you make a valve cover "spacer adapter"? Get it water jet cut with 2 sets of holes.
One set for the heads and the other threaded holes for the valve covers. Look here.
https://www.google.com/search?q=val...57.6940j0j4&sourceid=chrome&es_sm=93&ie=UTF-8

 

^^this.

 

I could see them as a nice desk lamp If you didnt want to do that you could sell them to somone that wants to IF you let them know the dont fit and get some of your coin back

 

This was my first thought..... Did you look into it ?

 

I bought them for 80 and spent 130 on polish so 210 is what i got into it

 

the bolt pattern is wrong. On a 385 series ford, thebottom corner bolts are farther out on the corners than BBC. Guys used to use a spacer when they used the chevy valve covers, very early days when there were no tall 385 series valve covers available to clear a stud girdle.

man, I would LOVE to have "Corvette" valve covers on a 460. Wonder if I could get some to fit an FE??

 

Ouch.

 

Could they be for one of those extra big displacement big blocks? I see some in the 540 ci range. I know some of those blocks are longer. The heads could be a bit different too. Just a thought.

 

the bigger displacement engines have larger bores, but they keep the same bore spacing, and the heads are the same. Unless you're talking about something like a ProLine engine...then all bets are off.

 

I was putting a brand new finned oil pan on Dad's Coupe this past weekend and some how cracked it cinching up the last bolt. I say you just do with your covers what Dad told me when he heard the pan pop...."Oh well...just hang it on the wall." LOL

 

For GM to produce those in quanities and a near zero rejection they would have be die cast and not sand cast as they appear to be

 

these were never made by GM.

 

I like the spacer idea. I have done it several times to make things bolt together. I make a dog leg studs and use a slotted hole in the spacer. Put on the gasket and screw the dog leg studs in. Put on the spacer with slotted holes to clear the offset. Another gasket and you are good. The top row can stay the same and the offset done with the bottom row. Nobody will ever find it. Just tell them it is for rocker clearance if they do.

 

Have a look at these heads... This 7 bolt version of the DRCE looks damn near identical to BBChevvie, but is about 1/4 too wide. Dirty trick, in my opinion. Nice valve covers, though.



http://www.karlperformanceparts.com...ormance-DRCE-2-Raw-Aluminum-Cylinder-Head/612

-Abone.

 

http://www.blackcanyoncl***ics.org/images/2011 Photos/20110618 - Valve Cover Racing - Delta/DSC09870.JPG http://www.blackcanyoncl***ics.org/valve_cover_racing.htm Pete

 

When you switch to jessel shaft rockers, these will be too short anyway Wonder if PML would throw you a bone and take them as displays, and help you get a set that you CAN use. That would reflect good on their part.

 

I click in the link but i dint see anything about 1/4in wider where did u see that?

 

And I think they attached the wrong photo. The ports are in the stock location in the photo, and that "491" casting number rings a bell. Also the head in the photo is not a raw casting, that's a fully machined head. I will try to look it up.

 

Link to that part number on ebay. This is a raw DRCE head, matches the description.
http://www.ebay.com/itm/Chevrolet-P...tock-Race-Cylinder-Head-Casting-/111037776385
They just used a generic BB chevy head photo in the link flamed a bone posted, that's not the right head in the photo, it doesn't match the description.
DRCE Pro Stock Cylinder Heads
Chevrolet Performance DRCE (Drag Racing Compe***ion Engine) Pro Stock cylinder heads are the choice of NHRA Pro Stock champions, so you know these are the best heads available. When races are won by thousandths of a second there’s no room for second-best parts. The Chevrolet Performance DRCE aluminum cylinder heads were specifically designed for the DRCE 2 engine block P/N 24502572 and intended for NHRA Drag Racing Pro Stock compe***ion applications.

Special features of these heads include high-capacity water jackets, symmetrical-port layout, ample wall material for custom porting, thick deck surfaces (7/8") to facilitate angle milling and reduced weight casting to minimize CNC-machining time. A typical CNC-prepped cylinder head without valves or valvetrain weighs approximately 40 pounds.

DRCE 2 Raw Aluminum Cylinder Head

• Raw aluminum casting, not machined
• Accommodates 10°–14° x 5° intake and 5°–9° x 2.5° exhaust valve angles
• Designed to work on DRCE 2 block P/N 24502572

DRCE Pro Stock Race Cylinder Head Technical Notes:

• T355-T7M aluminum construction
• Complies with NHRA Pro Stock 500-cid, 4.900" bore spacing rules
• Symmetrical intake port layout
• Intake and exhaust ports are extremely small “peanut ports”
• 7/8" thick decks allow for angle milling or heavy flat milling
• Requires professional porting and machining
• High-capacity self-purging water jackets
• Custom aftermarket rocker arm ***emblies required

Look at the intake port location on the ebay listing, THATS a spread port DRCE head, the one in Abones link is a run of the mill BBC head.

 

Photos from the ebay ad for PN 42502585 head. This is the part number in the ad abone posted. Note the intake port location as compared to a normal BBC head, like the one in the photo in abones link.
exhaust side

intake side

This is a raw casting for Pro-Stock and Comp elim. racers. They start with this and machine the head they want.