Hi all. I have finally been able to get to work on the wifes 66 again. I have run across something and would like to know if anyone knows anything about these heads. They are a GM performance head #14011077. They have been flowed and her are the numbers.

Int. 337 cfm at .700 lift
exh. 228 cfm at .700 lift

I cc'd the combustion chamber and came up with 116.5.cc's. I also cc'd an intake runner and came up with 310cc's. The intake valve is a 2.25 and the exh. is 1.88. The valve job is fresh as so are the vasco springs. I am not sure the their rating but I will address that later. This deal comes with a TEAM G #7540 intake. Here is the question. Does anyone know about these heads? Sonny leonards epoxied the inside of the intake to try and create an individual intake runner scenario and I was told he spent 800.00 on that and a light amount of porting. The motor was 496inches in a 3300lb 10" tire elcamino and it ran 5.60's with a 300 hit of nitrous so I am assuming this was a decent head. My intentions are to use these as a street head with no more than 9:5:1 compression with around 500 cubic inches. This chevelle also has a richmond 4+1 5 speed. This should allow me to runner a more stout cam but keep it streetable (solid roller). Now for the last part. I can get both heads and the intake for 1200.00. It looks like a deal to me. Any input is much appreciated. Sorry for the long post, theres a lot going on here.

John Weaver

Seems like decent intake flow numbers, not sure as to the value, but the exhaust port seems weak as compared to the intake. It should be able to flow more in comparison to the intake otherwise its a big restriction= graemlins/clonk.gif .
Dane

The intake is the one I used. I do not recommend it even with a lot of work we couldn't get it right. the heads have much more potentual. Even without making the runners huge they can see 370+ on the intake side. At 500inches the heads will work fine like they are but loose the intake.

Thanks for the replys. This big block stuff is all foreign to me. I have done a lot of engines over the years but have never worked with any big block chevy stuff. I made the deal last night. even if the intake did not work out, I still have a good deal. I need to post a picture so you can see the amount of work done to this intake. I was looking for a set of heads that were not cut up so we could upgrade if we wanted more power but with 500 inches and a good 250 shot of nitrous for high gear, this car will never see its true potential since we are not putting a cage in it.

Thanks,
John Weaber

Personally I would pass on the deal, the "074" and "077" heads are pretty much an amateur head. FYI out of the two the "077" heads are the better choice. The reason for this is because the "077" heads had the D-Port exhaust ports. These ports induced much better flow than the C-Port design of the "074" heads.

The flow numbers that you listed are indicative of unported heads (that's what they flowed from the factory). The weak part of the heads isn't the intake...it's the exhaust as some have noticed. Personally I would look into a head with around at LEAST 250-275cfm in flow on the exhaust side. Afterall the intake runners of the heads are already 310cc...if you are going to go big you might as well do it right. The exhaust (for the most part) is where you are going to make your horsepower numbers. The low cfm numbers of the exhaust will really hinder the heads without some major port work.

Aside from the poor flowing numbers the "074" and "077" heads have another disadvantage. The aluminum they are made of. The newer heads like Brodix, Canfield, AFR etc... use a much better aluminum (should read stronger). If you don't believe me check out some auctions on eBay, see how many heads have been repaired (rocker stud pads broken, cracked and then re-welded). If you plan on taking advantage of every cfm of flow by going with a .700" lift cam, this is something you would have to be careful of.

So all in all, I would look into a nice used pair of Canfields, AFRs, Brodix or what have you. You will be much further ahead in my opinion.

I dont know John,if you're not into chasing down 10's or something,... fyi, a pair of much worse 074s puts you at just under 500 hp with a nice flat tappet. Think if you're shooting for something like 550hp, or 11.99s, its more than doable with a SR.

Yeah, make sure you use ( if they havent already, and if a pro shop worked on them they would have) the longer reach rocker studs particularly on the exhaust.

Can't comment on the intake. Bolt it on and see what gives. Maybe its worth more to a racer?

Digging up an old topic, but I have a question.


I just bought a pair of complete, unported, set of '69 '074' heads for $550 shipped. They need springs and a valve job, maybe guides. They have had some repair work done on one of the rocker arm studs on each head. I'm no pro, but the work looks okay.

Good deal or did I just take it in the pants?

Here are some pics:

http://www.chevelles.com/showroom/bluerebl/71_1_b.jpg

http://www.chevelles.com/showroom/bluerebl/72_1.jpg

http://www.chevelles.com/showroom/bluerebl/cc_1.jpg

http://www.chevelles.com/showroom/bluerebl/da_1.jpg

http://www.chevelles.com/showroom/bluerebl/e0_1.jpg


I want them for my 427 going into my 280z, the weight reduction over iron heads should help alittle. I was planning on using a pair of LS-5 454 heads with the big valve treatment etc.

Need to get Mike Lewis (Wolfplace) to chime in here. I just sent him an NOS set of these 077 heads to prep for me. He flowed them and indicated in their current state the flow numbers were unimpressive, especially when compared to ARF 315's. I'm sure either one of the L88's I have will do quite well with them on the street. Time will tell!

Dave

Hey blue, if you want to sell them shoot me an email. I need a set for a buddies corvette. Its a 67 stingray. I think those are the same ones they used?????

They are hard as hell to find up here in the north land.

You mentioned that this is your wifes car...is she going to be racing it? I think its way too much head and intake for a cruiser, the max flow numbers mean nothing to a street car, I think it would be a slug,might look good when you raise the hood,but thats about it.

Bluerebl, The 074 closed chamber head is what all the NHRA S/S racers need. Whatever you do, DON'T port them as the results won't be that good anyway. Save them and get twice your money back. Then buy some 305 cc heads with the "CNC" chamber option.

Monte-73, This is the wrong head for your buddies '67 Corvette as the vette should be a closed chamber and the 077 heads are open chamber.

Bluerebl, Last sentence should read "AFR" 305 cc head with the "CNC" chamber option. My proofreading is almost bad enough to write for some of the magazines i get.

Originally posted by David_Bates:
Need to get Mike Lewis (Wolfplace) to chime in here. I just sent him an NOS set of these 077 heads to prep for me. He flowed them and indicated in their current state the flow numbers were unimpressive, especially when compared to ARF 315's. I'm sure either one of the L88's I have will do quite well with them on the street. Time will tell!

Dave =
Hi Dave,
Thanks for letting me play with your heads.
These were a virgin unfinished set of 077's with uncut seats.
Here's the numbers after a real good valve job with NO PORTING,
3 angle intake, 30/45/60, blended with a 75 deg from the 60 deg bottom to port
Valve backcut 30 degrees.
2 angle on exhaust, 35/45, with a full radius off the seat, 75 deg to port.
Again, no other porting in the chamber or ports.
I am posting a set of AFR's for comparsion off my bench so this is not some reprinted advertised stuff.
4.530 adapter, no pipe, 28"

077's------------AFR 315's
.05 42/33----------41/34
.100 76/64----------80/69
.200 154/107--------167/143
.300 221/140--------252/198
.400 270/171 -------315/240
.500 301/188--------357/267
.600 302/198--------382/279
.700 293/208--------390/283
.800 291/209--------388/286

Not terrible but nothing to get real excited about for a 310+cc port ;)
I think they could be improved quite a bit with some port work.

Originally posted by Monte-73:
Hey blue, if you want to sell them shoot me an email. I need a set for a buddies corvette. Its a 67 stingray. I think those are the same ones they used?????
Originally posted by Harold Sutton:
Bluerebl, The 074 closed chamber head is what all the NHRA S/S racers need. These '074' heads are the OPEN chamber ZL1 head, not closed like the earlier aluminum heads (closed chamber) I believe.

Look at the chambers, looks like open chambers to me: www.mortec.com (http://www.mortec.com) says the same.

http://www.chevelles.com/showroom/bluerebl/72_1.jpg

Mike are you sure about the intake volume? The set I had done (a long time ago) had a 290cc intake runner(long) The exhaust looked like it had an extra pound of alum. under the seat. With some mild port work they were fine (for the time). I always thought they would make an excellent street head with the small runners (both in. and ex.). The 074 heads is a different story it has the old large intake runner and an absolutely terrible ex. If you get the heads D ported on the exhaust they can be made quite usable for certain applications.

Originally posted by Mike Feudo:
Mike are you sure about the intake volume? The set I had done (a long time ago) had a 290cc intake runner(long) The exhaust looked like it had an extra pound of alum. under the seat. With some mild port work they were fine (for the time). I always thought they would make an excellent street head with the small runners (both in. and ex.). The 074 heads is a different story it has the old large intake runner and an absolutely terrible ex. If you get the heads D ported on the exhaust they can be made quite usable for certain applications. =
Not sure, I didn't measure it but I believe you are right, from memory it's supposed to be a 290-295cc port which would definitly be a better street port for most applications.
Thanks for the catch ;)

Hey Dave,
If you are following this, pour the port when you get them back & see what it measures graemlins/thumbsup.gif