041 heads worth rebuilding or should I buy new? - Chevelle Tech
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post #1 of 16 (permalink) Old Apr 7th, 20, 9:28 PM Thread Starter
 
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041 heads worth rebuilding or should I buy new?

I took my 70 Malibu's 350 out to clean up, and that ended up turning into a rebuild, so now I'm trying to decide if I should rebuild the 041 heads, or just buy new aftermarket ones. I'm never going to race, but it seems like for the money it cost to rebuild them I can grab some better flowing aftermarket aluminum heads. Thoughts?
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post #2 of 16 (permalink) Old Apr 7th, 20, 11:51 PM
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Re: 041 heads worth rebuilding or should I buy new?

If you can't do the work on them yourself or have it done for under 300 bucks i would look elsewhere.
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post #3 of 16 (permalink) Old Apr 8th, 20, 11:06 AM Thread Starter
 
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My original plan was to clean everything and lap the valves and replace the seals and springs better suited to the cam. Now that I need to rebuild it, I dont want the heads to be half assed. The machine shop by me quoted me $300 minimum plus parts, and that didnt include changing over the exaust seats. I am considering budget aluminum heads (around $1000/set) summit/jegs/brodix/edelbrock. I figure they should all flow better than my stock heads. I have no interest in tearing them down and doing extra port work or any of that, maybe just swapping the valve springs I bought over if needed.
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post #4 of 16 (permalink) Old Apr 8th, 20, 11:31 AM
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Re: 041 heads worth rebuilding or should I buy new?

Well chad heres my two cents worthif the heads have never been done fix what you have.if you get the right machinist you can get them done reaonable. Changing guides with sleeves can get expensive . You can roller knurl the guides u t p method and they will be fine if done slow and properly then reamed and honed. You can only grind the valves once and have them be good .if it costs too much to fix there is two ways you can go without killing the wallet. One a pair of summit 152123 heads these are dart ss heads.two you can go vortecs but you will need a manifold and rcker arms. Scoggin and dickey in texas sells a kit with everything jegs makes a manifold thats reasonable in satin finnish . For cams an isky 270 mega or an elgin prostock e1065pk or a 1788pk. I have to thank jeff swisher for some of this information credit where its due. Alex
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post #5 of 16 (permalink) Old Apr 8th, 20, 2:10 PM
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Re: 041 heads worth rebuilding or should I buy new?

You DO NOT need hard exhaust seats with unleaded fuel.
If your seats are in good shape then lap and go.
I have ran my "Non hardened" seats in old 60's cars for hundreds of thousands of miles and NEVER had a seat recess on me.

If you let it rattle from too little octane or too much timing that will destroy the seats.
DON'T do that.

We were not easy on my old double humps and power pack heads either. I revved the snot out of them and many times pulled trailers and boats.

Keep the tune spot on and keep engine temps cool.

If you are capable of changing springs then look at the seats of course and decide after that.
How much you cut off the valve face will determine how many times you can reface them.
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post #6 of 16 (permalink) Old Apr 8th, 20, 2:29 PM
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Re: 041 heads worth rebuilding or should I buy new?

If you were to see the pitting on the late Model Vortec heads you would be stunned. I had one set that only 46K on them and the exhaust seats and valve faces looked terrible. So much for hardened this or that, running stuff lean burns valves and seats.


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post #7 of 16 (permalink) Old Apr 8th, 20, 2:47 PM Thread Starter
 
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When I took the valves out, I crudely checked the guides by putting oil on the valve stems and wiggling the valves, and all seemed good there. The intake seats all looked good, the exaust seats however , seemed to vary in size from one to the other.
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post #8 of 16 (permalink) Old Apr 8th, 20, 3:11 PM
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Re: 041 heads worth rebuilding or should I buy new?

Ive had them sink, wasnt worth the $ when I was done .All rebuilt, bigger valves made 0 more power.
Sold them for a loss and went aftermarket. They are so much better and reasonable today it makes no sense not to.

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post #9 of 16 (permalink) Old Apr 8th, 20, 9:58 PM
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Re: 041 heads worth rebuilding or should I buy new?

Sell those heads and get some Vortecs.
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post #10 of 16 (permalink) Old Apr 8th, 20, 10:26 PM
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Re: 041 heads worth rebuilding or should I buy new?

While I had a set of 041s that treated me well in the early 1990s, these days, putting money into old SBC heads is a waste of time, effort, and money.

Today's aftermarket heads...or even GM Vortecs....are way better and will cost less in the long run.

'69 Malibu 383/TCI TH350/8.2 3.36 Eaton Posi. Street Edge 10" 2800, E-Tec 170s, Custom Mike Jones HR Cam, RPM Air-Gap, StreetAvenger 770, Pertronix HEI, Hedman 1 5/8" Headers, Moser Axles, PMT 1320R Kit. [email protected] 111 MPH, 1.6865 60 ft, Nitto 555
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post #11 of 16 (permalink) Old Apr 8th, 20, 10:34 PM
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Re: 041 heads worth rebuilding or should I buy new?

Those 041s are no good, can you send them to me so I can dispose of them properly?

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post #12 of 16 (permalink) Old Apr 8th, 20, 11:09 PM
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Re: 041 heads worth rebuilding or should I buy new?

Quote:
Originally Posted by VORTECPRO View Post
Those 041s are no good, can you send them to me so I can dispose of them properly?
Well played!

'69 Malibu 383/TCI TH350/8.2 3.36 Eaton Posi. Street Edge 10" 2800, E-Tec 170s, Custom Mike Jones HR Cam, RPM Air-Gap, StreetAvenger 770, Pertronix HEI, Hedman 1 5/8" Headers, Moser Axles, PMT 1320R Kit. [email protected] 111 MPH, 1.6865 60 ft, Nitto 555
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post #13 of 16 (permalink) Old Apr 9th, 20, 12:10 AM
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Originally Posted by 68Chevele View Post
Sell those heads and get some Vortecs.
Best advice

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post #14 of 16 (permalink) Old Apr 9th, 20, 7:43 AM Thread Starter
 
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Thanks for the help everyone, I think I'm gonna shelf the original heads, and look for either vortecs, or aluminum
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post #15 of 16 (permalink) Old Apr 9th, 20, 8:35 AM
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Aluminum heads run cooler, transfer less heat to intake, allow more timing sooner or lower octane gas , and take weight off front end.
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