Guest Anonymous Posted March 12, 2001 Share Posted March 12, 2001 Hello everyone, For those of you that didn't read the previous posts, I"m the guy with the cracked double hump head. Well, I was talking with the guys at the machine shop, and he gave me these options: Buy some of there remade heads, casting number 220, with 160 intake and he thought a 72 cc chamber. cost 194 + 50 core The questions I have are these: 1) What does the casting number mean? 2) My stock heads were 218 and the Double hump were 168? 3) Are the heads he want's to sell me worth it, or are the the same as the stock one's I had on? This place is a very good machine shop, and they are down to earth. I just wanted to get some other info from people. I mean, will the difference in cc for the chamber make that big a difference? I only ran the car hard like twice, and with those double hump heads, even though they were cracked, She screamed. I want to make sure I get at least the same if not a touch better. The machine shop said in his opinion, the heads he want's to sell me are a better head. I just want to make sure I don't get screwed again, or buy something that is a great head, but not the performance factore I want. Thanks for all the info guys. Sean ------------------ "I feel the need, the need for speed!!" "Don't hate the player, hate the game!" Quote Link to comment Share on other sites More sharing options...
Racin_Jason Posted March 12, 2001 Share Posted March 12, 2001 Hi Sean Ok well Im alittle confused by the casting numbers you list here. First of all the casting number is GM's identifying system for the heads and its usually located in the center/top of the head (under the valvecover). The 3 numbers that are thrown around, like 186, are the last three digits of the number and are the common identifyer among car guys. You can go here and have a look to see how these numbers tell you what you are getting.. http://www.ammotorsports.com/chvheads.htm Now I couldnt find EITHER of the numbers you listed..but If the 168 is actually a 186 'HUMP' head then those were some of the better ones. They are listed as having 2.02I and 160E valves with a 63cc chamber. These 'camel-hump' heads can support some decent HP numbers. If they are 186 'NON-humps' then they have the smaller 1.94" intake but still have the 63cc chamber. I can't find anything close to "220" casts. One thing I can tell you tho is if you have 186's on there now (with 63cc chamber) and go to the used heads (with a 72cc chamber)..you will be losing compression and HP for sure. Im gonna guess that the heads he's selling aren't as good as your cracked heads..that is if I decoded all the wrong info here correctly and they ARE indeed camelhump's with 63cc chambers. But the "220's" might very well be a comparable head..but Ive never heard of them and cant find any data on them. Hope this helps alittle.. Jason [This message has been edited by Racin_Jason (edited March 12, 2001).] Quote Link to comment Share on other sites More sharing options...
Guest chevsun Posted March 13, 2001 Share Posted March 13, 2001 It looks like we are travelling in the same lane. I should have my T-56 this week. I ordered the Mcleod twin disc setup to go with it. Then to top it all off I got a call from my machinest yesterday who gave me the good news that both my double hump heads were cracked and he offered me a similar solution with some heads he had. So after weighing the options and knowing that next winter I will be going 383 I ordered a set of 64cc edelbrock RPM aluminum heads and 1.52 roller tip rockers. I just hated to put a lot of money into some Iron heads when I dident know there history and I could buy brand new and know what I had. I hope that I dont run into problems with these heads working with a performer intake and 650 carb. My cam is 214 224 @50 w/280 290 adv. and 443 465 lift. I will upgrade all this when I rebuild. Good luck with your project I hope I can get mine back together by spring.Still snowing here. Steve Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 13, 2001 Share Posted March 13, 2001 I gathered from what you've said that he is selling you a 160cc intake runner, rebuilt head. That will make great tork on the bottom end, but won't flow much for the mid to top end. $194.00 plus $50.00 core?? It this right? Is this per head? $488.00 total? Is there tax? That would be an O.K. price. They aren't doing you any favors. This is going to be an O.E. low performance head. If you can double the money you can get an aluminum performance head. It's only money. Quote Link to comment Share on other sites More sharing options...
Kevin Shasteen Posted March 13, 2001 Share Posted March 13, 2001 Hey Sean, I cant find anything on the numbers "220" you gave either. Are you sure you're not confusing the "220" as the Intake Airflow & the "160" being the Exhuast Airflow as these numbers sound proper for a set of reworked cyl.heads. As stated previously the higher CC'd combustion chamber of the heads you're thinking about would hurt your compression & HP. If those heads have been reworked & are producing the 220/160cc's this would be good...except for the lower CC Combustion Chambers; In other words: .....the Reworked Heads you're thinking about 220/160cc's help Airflow; however, the lower CC'd Combustion Chamber 72cc "HURT" your Airflow........ It's a give & take & I think the way your engine is set up (Cam & Intake)....these cyl.heads are taking more than they would be giving! Sorry to hear your heads are cracked. However, Since we are walking this path-have you considered saving your money & buying aftermarket Alluminum Heads(?). If this is not your daily driver...let it sit till you can afford the alluminum heads; you just plopped down the money for a T-56. The T-56 & the newly installed alluminum heads would make your car go, go, gooooo! Anyway; if you're not ready for alluminum cyl.heads then confirm those cyl.head casting #'s your machine shop is giving you-come back to us for reassurance. Kevin, (Yes,Still an Inliner) Quote Link to comment Share on other sites More sharing options...
Ray Posted March 13, 2001 Share Posted March 13, 2001 I will say this again take a look at the Vortec heads they flow as good as the RPM's up to .500 lift and are only 219 each assembled !!!(no core charge either) from Scroggin and Dickey. They still have the GM copy of the Performer RPM as a takeoff for 129. So for 567+ shipping you get 2 new heads and an intake.... take a look at the Sallee chevy site for the flow numbers and compare it to the others.... its cheep and a good head.... BTW if you are looking at the RPM's look at the Fast Burn heads they are great up to .600 lift and have a very efficent combustion chamber...and are arround the same price... The more you know the better off you are and the less it will cost for the same performance....... ------------------ Remember it is only a piece of metal. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 13, 2001 Share Posted March 13, 2001 Ok, thanks for all the info guys. I sorta figured that the heads he was selling me weren't as good as performance. I asked him if they were good, and he would say, "yeah, I think they are a good head" He also couldn't tell me the size of the chamber, so that kinda made me wonder. I have thought about alum heads, but it seemed like everytime I saw them they were way up there in price. I'll look into some of the old posts and try to get some info. This is kinda of my daily drier, but it's also kinda not. I do want performance is a must. If anyone else want's to give there .02 I would greatly appreciate it. Thanks a million. sean ps I sorta think that he was basically trying to sell me a set of stock heads with a little bit of boring done. I dont' think I wanna do that. I already have some stock heads if I wanted stock. then again, if i wanted stock I wouldn't have put a 350 in my 280 ------------------ "I feel the need, the need for speed!!" "Don't hate the player, hate the game!" [This message has been edited by ellobo97 (edited March 13, 2001).] Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 13, 2001 Share Posted March 13, 2001 For those of us with older bolt style manifolds (don't work with the Vortec Head), someone in Hot Rod is offering drilled L31 heads to work with the older manifolds. Seems like a reasonable alternative for the $50 they charge. Then you just have to get new valve covers. Ct.. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 14, 2001 Share Posted March 14, 2001 Ok, another dilema. Went to the machine shop today to shoot the S*** with them, and here is another idea. Get some Holley Alum heads with 64 cc, 2.02/192, and I think he said something like 180 runners, but not sure on that one. He asked me what I was looking for in max hp, and told him 400 and that was what he recommended. Complete price is 1050. I didn't think that was a bad deal. I think I'm gonna sleep on it and then go get them tomorrow unless anyone has a better idea. He said he didn't recomment trick flow, he has has quite a few probs with them. Well, all feedback will be greatly appreciated. Talk to everyone later sean p.s. I found this on holley's web page, these are the one's that they are talking to me about. 68cc combustion chambers. Intake runner volume is 185cc while exhaust runner volume is 68cc. Intake valves are 2.02-inch in diameter, 4.920-inch in length, with 11/32-inch diameter stems. Exhaust valve diameter is 1.600-inch ps the one's I ordered are inatke flows 220, exhaust 178, 2.02/1.600 and 64 cc chambers, can't wait to get them on come in next week ------------------ "I feel the need, the need for speed!!" "Don't hate the player, hate the game!" [This message has been edited by ellobo97 (edited March 13, 2001).] [This message has been edited by ellobo97 (edited March 14, 2001).] Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 16, 2001 Share Posted March 16, 2001 For good cylinder head info go to www.airflowresearch.com. When there go to the artical archives. They have an artical from chevy hi po called flow to go which flow test about 20 different heads including 4 types of stock chevy,variaous offerings from Brodix, Airflow Research, Canfield, Holley, Trick Flow and Edelbrock. They also have other head articals good luck Quote Link to comment Share on other sites More sharing options...
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