Evans Aluminum Heads
 

Was looking at a new set of Evans heads on eway for sale for a flat head any one running them thanks

Re: Evans Aluminum Heads
 

They're all pretty much the same. The important part is that any heads need to be custom fitted to the particular engine to obtain optimum quench. See the thread By "GB Sisson" entitled "276 stroker from 35 years of parts"; it has just about everything you need to know.

"New" Evans heads? If they really are, I'll bet they are super expensive.

Re: Evans Aluminum Heads
 

Post some pictures of the combustion chambers - many of us can tell just by looking at them whether or not we'd recommend using them.

Re: Evans Aluminum Heads
 

If these are the NEW ones that are on places like eBay, they are a modern product - the chambers are very different from the originals.

From looking at the pictures, they appear to be well made, I'd not be afraid to consider using them.

Re: Evans Aluminum Heads
 

Someone must be re-popping them. Any idea who? The price is quite reasonable.

Re: Evans Aluminum Heads
 

Thanks guys yea they are on eway nice looking heads and has a decent price on them just looking for more info and thoughts

Re: Evans Aluminum Heads
 

The chambers appear to be quite big over the transfer area - so compression will be down as compared to many other heads, but flow will probably be good. In the end, it will probably make no difference. I would use a gasket and blend any sharp edges (in the middle areas) - as they appear to be inside the normal gasket profile.

Re: Evans Aluminum Heads
 

http://myflatheadford.com/wp-content...1-1024x768.jpg

http://myflatheadford.com/wp-content...3-1024x768.jpg

Re: Evans Aluminum Heads
 

Pay it if you want the "Bling". If looking to increase performance, angle mill the stock heads (per 'Ol Ron).

Re: Evans Aluminum Heads
 

Check this out...same chambers on these "Edelbrock" heads on ebay. Very strange.


https://www.ebay.com/itm/39502650549...G4B4Z5ZHAGD05F

Re: Evans Aluminum Heads
 

Re: Evans Aluminum Heads
 

Edelbrock changed their chambers in their "modern" head quite a few years ago. Truthfully I liked their original cast chambers better. But, they are milling the valve pockets way deep - probably to reduce the amount of tech-support bitch calls.

These new Evan's heads have a deep radiused transfer area (like stock heads) - so compression is probably low on a stock displacement deal - but cubic inches always help compression so make em' big boys!

Re: Evans Aluminum Heads
 

The combustion chamber of these new heads are not that bad for a street engine, However the spark plug iz in the wrong place. Any place would be better than here.
Gramps
You buy them books and all they do is eat the covers!!

Re: Evans Aluminum Heads
 

I was told they only make this head in 75cc because people wanted bigger chambers so they can use regular gas makes sense .

Re: Evans Aluminum Heads
 

They're just making up stories. You can run regular gas all day with the higher compression heads and how many folks are really worried about using regular vs premium in their flatheads . . . that few drive more than a couple hundred miles a Summer.

Re: Evans Aluminum Heads
 

“You buy them books and all they do is eat the covers!!”.......
The ‘Ol Boy has still got his sense of humor!!.......Mark

Re: Evans Aluminum Heads
 

Thanks thses heads come in 70cc not the 75cc i was wrong in previous post yea they look just like the Edlebrocks

Re: Evans Aluminum Heads
 

Note, from what I can tell the transfer/relief area of the chambers on these new Evan's heads is much deeper than Edelbrock's are. You can see that in the pics - seems pretty obvious to me.

The Evan's heads have a transfer area much like a stock head.

Re: Evans Aluminum Heads
 

So would you run these nice looking heads though

Re: Evans Aluminum Heads
 

They look nice - can't claim to compare/contrast their performance to others (have never ran them). Nor can I comment on the quality of machining, hole placement, etc..

In the end, run what yah like!

Re: Evans Aluminum Heads
 

FWIW Edlebrock make 2 different heads 1115 with 64 CC and 1116 with 75 CC. They are in fact the same casting but the 1116 chambers have been hogged out some. We are currently dealing with some 1115 heads that CC 74 after many tests. I realize that my measurements are not perfect but my results are consistent (these heads are new, not used. We have another set of heads on the way and I will measure them as well. I would not normally measure new heads but the valve area looked huge compared to the heads we took off. For quite awhile we thought that the heads were in the wrong box because Edlebrock does not mark the heads in any way to identify which ones they are, you can only tell by looking at the chamber. The larger ones are aimed at 7.5:1 for blower motors and such. We are waiting on that new pair of heads to arrive to pursue the question some more (the first pair has already been returned).. I know enough to take surface tension into account (I am not using a plate over the chamber) but I have been very careful and I can’t see me being off by 10 CC. The Edlebrock heads we removed from the motor have undoubtedly been milled (at least one of them for sure) but they measured 64cc. I find it hard to believe that a Flathead could be milled enough to change the chamber that much. Also, there was no interference with the piston nor the valves with a Max 1 cam. When using a depth gauge the “new” heads measured a full .125” deeper over the valve pocket as compared to the “old” heads.

Re: Evans Aluminum Heads
 

Interesting keep us posted in your findings thanks

Re: Evans Aluminum Heads
 

Jeep Guy: That does not surprise me at all. One can see by looking at the amount of material they now mill from above the valves that the chambers are a lot bigger than the older "as cast" chamber versions.

They are now going about .500 deep over the valves - maybe because they just wanted to "punt" and not get any tech support calls due to folks having their valves hit the heads on very high-lift cams.

It makes no sense to me why they just did this "one size fits all" machining operation - but they did. This is why if using Edelbrock heads on the street I would run the 1115 chambers - then tune the squish to .040 (which probably means milling them a bit).

Re: Evans Aluminum Heads
 

When I was doing compression work on combustion chambers( Ieven mad my own flow bench) I discovered the fact that finding the chamber volume was impassable!!! Si I mad aCC measuring tube for the spark plug, then measured the volume of the head. then instaled head on engine and placed the piston about1/4 below TDC added about 30 cc more than the head volumn and found the culpurt?? I had 12 more cc's than the heads
Probably the clearance over the piston and a few other places.?????
For a Veru old design, it keeps getting beter
Gramps

Re: Evans Aluminum Heads
 

So interesting enough, I just installed a brand new, from the box set of 1126's (Block letter version of the 1116's). I CC'd both heads and got 70cc's.

Re: Evans Aluminum Heads
 

Well, I have a brand new set of Eddy heads - will have to CC them. First, I need a hunk of plex! LOL

Re: Evans Aluminum Heads
 

Getter done 1126,1115,1116 which Eddys

Re: Evans Aluminum Heads
 

I have an original set I’m planning to use for a 59AB in my 35. Anything I should know about these?
Really more for looks/nostalga rather than performance

Re: Evans Aluminum Heads
 

Would be nice to post a picture of the chambers - so folks can see how different the original "cast chambers" are as compared to these new repop heads (as well as the Edelbrocks).

Re: Evans Aluminum Heads
 

Re: Evans Aluminum Heads
 

EVANS

https://www.proxibid.com/_next/image...pg&w=1200&q=75

https://www.proxibid.com/_next/image...pg&w=1200&q=75

https://www.proxibid.com/_next/image...pg&w=1200&q=75

Re: Evans Aluminum Heads
 

I’ll try and snap one when I get home tonight.

Re: Evans Aluminum Heads
 

Great looking set of heads - in fantastic shape! I wished I owned them . . . would be nice on a big cube blown motor! LOL

Notice how completely different the chambers are as compared to the latest repop versions. The repops almot look like they copied the modern Edelbrock's and then made the transfer areas deeper . . . makes little sense to me!

It is obvious that these originals have a lot better chambers than the repops! ;)

Re: Evans Aluminum Heads
 

Mine are not as pretty as those for sure.

Re: Evans Aluminum Heads
 

Re: Evans Aluminum Heads
 

They look pretty good to me. Interesting that they have a pretty deep transfer area as well - good for flow and higher RPM usage for sure. Would be interesting to CC them.

Re: Evans Aluminum Heads
 

They are stamped with only 281, unlike the ones above that have 2811?