Which heads to use - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CustomMike · 01-14-2003, 03:23 PM

I am building a stock 350 with a mild cam and headers. I have two sets of heads. One set is 3998920 the other is 333882 in the heavywieght casting. Which ones will be better? They both appear to have the same size valves.

BobS · 01-14-2003, 09:16 PM

I'm not familiar with the 920s but based on past experiences with 882s, I'd go with the 920s, they can't be any worse.

neonlarry · 01-14-2003, 09:34 PM

I would use the 882s, or try to find some better heads. The 882s are supposed to be the best of the common smog heads, but they still aren't great. There are good heads around if you are lucky. I have found a set of ready to use 487x heads, and a set of 291 camel humps that might need some work, both for really cheap. Since you are just building a stock engine though, the 882s would be fine.

ChevLoRay · 01-14-2003, 10:57 PM

Vortec.

bigjimzlll · 01-14-2003, 11:03 PM

the 882s,if they are the heavy castings are a good head. I dont believe all the flow numbers Ive read on them though..they say they flow as well as vortecs and good fuellies. for a mild build they would be fine.
Jim

01-14-2003, 03:23 PM	#1
CustomMike Registered User Join Date: Oct 2002 Location: Harrisonburg Va Posts: 12	Which heads to use I am building a stock 350 with a mild cam and headers. I have two sets of heads. One set is 3998920 the other is 333882 in the heavywieght casting. Which ones will be better? They both appear to have the same size valves.

01-14-2003, 09:16 PM	#2
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	I'm not familiar with the 920s but based on past experiences with 882s, I'd go with the 920s, they can't be any worse. __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel

01-14-2003, 09:34 PM	#3
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	I would use the 882s, or try to find some better heads. The 882s are supposed to be the best of the common smog heads, but they still aren't great. There are good heads around if you are lucky. I have found a set of ready to use 487x heads, and a set of 291 camel humps that might need some work, both for really cheap. Since you are just building a stock engine though, the 882s would be fine. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

01-14-2003, 10:57 PM	#4
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Vortec. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

01-14-2003, 11:03 PM	#5
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	the 882s,if they are the heavy castings are a good head. I dont believe all the flow numbers Ive read on them though..they say they flow as well as vortecs and good fuellies. for a mild build they would be fine. Jim __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA



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