350 heads - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KMAT · 07-20-2019, 05:25 AM

Okay since this is my favorite site to post on but yet it's been awhile I'm looking at purchasing a set of World products Sportsman 2 heads from a guy that had them on a 355 gm dirt track race car I'm a little concerned about the pitting that I hope you can see in the picture my concern is will it be any type of an issue some feedback would be so much appreciated

aerotest · 07-20-2019, 01:04 PM

As long as you can mill the sealing surface should be fine. You can polish the chambers if you like. Looks like they used blasting to clean the heads. I would have them checked for cracks when getting them resurfaced.

KMAT · 07-20-2019, 02:07 PM

Okay,thanks, milling would change cleances and raise compression, i think. I have read up a little bit on that,not sure i wont to do that, but the price for heads is a hood deal, wth rollor rockers, but no push rods guy wont $500. Hmmm what to do.
Again thanks for the input

KMAT · 07-20-2019, 02:08 PM

Just asking what would happen if I did not mail them down

**HO455** · 07-20-2019, 02:46 PM

If the matting surfaces are good don't worry about the combustion chambers. It is debatable whether or not if there is any benefit to polishing combustion chambers. Especially for a street vehicle. If the price is right and your happy go for it.

68Gold/white · 07-20-2019, 03:37 PM

My biggest concern is that the heads have been on a "racing" engine. Ask if he would stand behind them after they are checked for cracks.
World product heads are made of very good iron. I'm thinking you should be OK.
Did he say what size the chambers are???

There are some scotchbrite flappers that attach to a mandrel that you could use to polish the chambers...

HO, are you a member on performance years??

KMAT · 07-20-2019, 07:24 PM

Thanks a lot for the additional input I do appreciate it the heads have 2.02, 1.94 valves, 64cc chamber, 200cc intake runners, i offered the guy 300 and a 12 pack. And we closed the deal. Now i just have to figure out push rods. He didnt have any spares.
Again really appreciate the feedback and input.!!!!

68Gold/white · 07-20-2019, 07:40 PM

Quote:

Originally Posted by KMAT

Thanks a lot for the additional input I do appreciate it the heads have 2.02, 1.94 valves, 64cc chamber, 200cc intake runners, i offered the guy 300 and a 12 pack. And we closed the deal. Now i just have to figure out push rods. He didnt have any spares.
Again really appreciate the feedback and input.!!!!

Cool!!! Do you have dished pistons??? 64cc chambers on a 350 will have fairly high compression with flat top pistons. It can be made to work, other engine components will have to fall in line to make it happen, though...

KMAT · 07-20-2019, 08:18 PM

Bore 30 over flat top pistons 4 bolt block.earsons roller rockers,long tube headers,wieand stealth intake, q junk carb..I dont think ill do any porting of sorts to heads,i hear and read can to intake side but bad idea to exhaust

aerotest · 07-20-2019, 09:23 PM

Get a push rod checker from summit and measure the required pushrod. The wrong length can cause a lot of issues. That will be a hot little motor with that much compression.

KMAT · 07-20-2019, 10:48 PM

The rollers are 1.60.1 intake and 1.50.1 exhuast. And sugestions for a better carb that this q junk.
I am thinking of changing out my trans, have a 700r4 now, an dont think it will handle the horsepower

**HO455** · 07-21-2019, 02:33 PM

[QUOTE=

HO, are you a member on performance years??[/QUOTE]

Yes, I do troll over there from time to time. I don't think I've posted anything in quite a few years. You must have been pretty deep in the archives to make this connection.

KMAT · 07-21-2019, 03:09 PM

Once again THANK YOU for the info to those whom replied to my posts@!

68Gold/white · 07-21-2019, 06:34 PM

Quote:

Originally Posted by HO455

Yes, I do troll over there from time to time. I don't think I've posted anything in quite a few years. You must have been pretty deep in the archives to make this connection.

No, I've seen you post here. HO455 could only be a Pontiac...LOL
I'm an expert at nothing. I post there some, if I've been there, and done that. Thankfully Cliff still posts there. He's (LOL) done a great job of shutting off the Pontiac folks from using E-carbs...

68Gold/white · 07-21-2019, 06:41 PM

Quote:

Originally Posted by KMAT

Bore 30 over flat top pistons 4 bolt block.earsons roller rockers,long tube headers,wieand stealth intake, q junk carb..I dont think ill do any porting of sorts to heads,i hear and read can to intake side but bad idea to exhaust

Your compression ratio is close to 10:1. With the correct cam you can make your combo work.

LOL, there is not a better carb than a Quadrajet. It will need to be calibrated to your engine specifically
Your quadrajet can be made to work. You need to contact Cliffshighperformance.com You need to email him. he can sell you all the parts for your carb to make it shine. His stuff isn't cheap, but is worth every penny Get his Q-Jet book!!!
Have him recommend a cam for your combo also...He is the answer man!!!

07-20-2019, 05:25 AM	#1
KMAT Registered User Join Date: Oct 2018 Location: Sioux center, IA Posts: 81	350 heads Okay since this is my favorite site to post on but yet it's been awhile I'm looking at purchasing a set of World products Sportsman 2 heads from a guy that had them on a 355 gm dirt track race car I'm a little concerned about the pitting that I hope you can see in the picture my concern is will it be any type of an issue some feedback would be so much appreciated Attached Images

07-20-2019, 01:04 PM	#2
aerotest Registered User Join Date: Jan 2018 Location: TN Posts: 104	Re: 350 heads As long as you can mill the sealing surface should be fine. You can polish the chambers if you like. Looks like they used blasting to clean the heads. I would have them checked for cracks when getting them resurfaced. __________________ 1969 C10 Suburban Custom (Factory 396/TH400, survivor with no rust)

07-20-2019, 02:07 PM	#3
KMAT Registered User Join Date: Oct 2018 Location: Sioux center, IA Posts: 81	Re: 350 heads Okay,thanks, milling would change cleances and raise compression, i think. I have read up a little bit on that,not sure i wont to do that, but the price for heads is a hood deal, wth rollor rockers, but no push rods guy wont $500. Hmmm what to do. Again thanks for the input

07-20-2019, 02:08 PM	#4
KMAT Registered User Join Date: Oct 2018 Location: Sioux center, IA Posts: 81	Re: 350 heads Just asking what would happen if I did not mail them down

07-20-2019, 02:46 PM	#5
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,804	Re: 350 heads If the matting surfaces are good don't worry about the combustion chambers. It is debatable whether or not if there is any benefit to polishing combustion chambers. Especially for a street vehicle. If the price is right and your happy go for it. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

07-20-2019, 03:37 PM	#6
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,280	Re: 350 heads My biggest concern is that the heads have been on a "racing" engine. Ask if he would stand behind them after they are checked for cracks. World product heads are made of very good iron. I'm thinking you should be OK. Did he say what size the chambers are??? There are some scotchbrite flappers that attach to a mandrel that you could use to polish the chambers... HO, are you a member on performance years??

07-20-2019, 07:24 PM	#7
KMAT Registered User Join Date: Oct 2018 Location: Sioux center, IA Posts: 81	Re: 350 heads Thanks a lot for the additional input I do appreciate it the heads have 2.02, 1.94 valves, 64cc chamber, 200cc intake runners, i offered the guy 300 and a 12 pack. And we closed the deal. Now i just have to figure out push rods. He didnt have any spares. Again really appreciate the feedback and input.!!!!

07-20-2019, 08:18 PM	#9
KMAT Registered User Join Date: Oct 2018 Location: Sioux center, IA Posts: 81	Re: 350 heads Bore 30 over flat top pistons 4 bolt block.earsons roller rockers,long tube headers,wieand stealth intake, q junk carb..I dont think ill do any porting of sorts to heads,i hear and read can to intake side but bad idea to exhaust

07-20-2019, 09:23 PM	#10
aerotest Registered User Join Date: Jan 2018 Location: TN Posts: 104	Re: 350 heads Get a push rod checker from summit and measure the required pushrod. The wrong length can cause a lot of issues. That will be a hot little motor with that much compression. __________________ 1969 C10 Suburban Custom (Factory 396/TH400, survivor with no rust)

07-20-2019, 10:48 PM	#11
KMAT Registered User Join Date: Oct 2018 Location: Sioux center, IA Posts: 81	Re: 350 heads The rollers are 1.60.1 intake and 1.50.1 exhuast. And sugestions for a better carb that this q junk. I am thinking of changing out my trans, have a 700r4 now, an dont think it will handle the horsepower

07-21-2019, 02:33 PM	#12
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,804	Re: 350 heads [QUOTE= HO, are you a member on performance years??[/QUOTE] Yes, I do troll over there from time to time. I don't think I've posted anything in quite a few years. You must have been pretty deep in the archives to make this connection. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

07-21-2019, 03:09 PM	#13
KMAT Registered User Join Date: Oct 2018 Location: Sioux center, IA Posts: 81	Re: 350 heads Once again THANK YOU for the info to those whom replied to my posts@!



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