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

CustomMike · 12-28-2002, 07:03 PM

I have a set of heads off of a 350 with 333882 stamped on them. I would appreciate any information on them. I know they have 1.94 intake and1.5 exhaust valvesbut I don't know the cc chamber. Are they good or bad and what horsepower motor would they be bolted on to.

**1970 CST Short Wide** · 12-28-2002, 07:10 PM

Those are what some call " light weight heads" Beware of cracks in the center exhaust seats, VERY common

Longhorn Man · 12-28-2002, 07:47 PM

There were some light, and some heavy.
As far as smogger heads go, these are some of the better flowing ones. Even the light ones will hold up OK...I had my light 882's (on my GMC with some porting done to them) up to 260 degrees once if memory serves. I lost a fan belt out on the freeway and I was doing about 80 - 85 MPH.
They held up just fine. Not that I would recomend yankin off your belt to test them...

mikep · 12-28-2002, 08:02 PM

flow figures for those heads

.100" lift intake ... 70 CFM
.100" lift exhaust... 59 cfm

.200" intake... 125 cfm
.200" exhaust... 109 cfm

.300" intake... 178 cfm
.300" exhaust... 136 cfm

.400" intake... 204 cfm
.400" exhaust... 143 cfm

.500" intake... 205 cfm
.500" exhaust ... 144 cfm

Ideally you want your flow numbers to be in the 75 % exhaust to intake. Those heads are pretty close although your ports start restricting flow around .400" of valve lift. Your best best wold be a fairly sraight pattern cam with somewhat equal duration and lift in the mid .400" lift range and around 215-225 degrees at .050" duration. With a performer intake or something similar and a 600 cfm carb you'd be looking at around 325 HP or so. Running it through the desktop dyno I picked up 332 HP with a comp cams XE 268 and 378 ft lbs of torque at 3500 RPM using small tube headers and duals

flyin99 · 12-28-2002, 08:03 PM

A majority of the small blocks I have rebuilt for people, seemed to have 882's on them. They must have been very common. I also read somewhere, that they were considered "the best of the worst"...........

*67/72junkie* · 12-28-2002, 10:29 PM

They are 76cc and are good heads for street usage on pump gas .Make sure you have a set with a 1976 or later casting date so they will have hardened seats for unleaded gas.If not you will have burnt valves before long.

jmanz69 · 12-28-2002, 10:37 PM

I have a set of these in my garage right now that I have been trying to get rid of for a while. I thought the were decent heads but I kept hearing that they were awful. I bought them cuz they were better than the 305 heads I had on. They are just empty castings right now waiting for new parts. Should I keep them and have them worked on or sell them cheap?

bigjimzlll · 12-28-2002, 11:02 PM

if you have them worked...valve job..tanked..new seats..valves ..retainers..springs ..seals..locks..you will be looking at over 300.00 and all you will have is a set of mediocre stock heads..if you do a bowl port job..thats 200.00 more..for a couple of hundred more you can get some nice aftermarket heads...

12-28-2002, 07:03 PM	#1
CustomMike Registered User Join Date: Oct 2002 Location: Harrisonburg Va Posts: 12	heads I have a set of heads off of a 350 with 333882 stamped on them. I would appreciate any information on them. I know they have 1.94 intake and1.5 exhaust valvesbut I don't know the cc chamber. Are they good or bad and what horsepower motor would they be bolted on to.

12-28-2002, 07:10 PM	#2
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,111	Those are what some call " light weight heads" Beware of cracks in the center exhaust seats, VERY common __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

12-28-2002, 08:02 PM	#4
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	flow figures for those heads .100" lift intake ... 70 CFM .100" lift exhaust... 59 cfm .200" intake... 125 cfm .200" exhaust... 109 cfm .300" intake... 178 cfm .300" exhaust... 136 cfm .400" intake... 204 cfm .400" exhaust... 143 cfm .500" intake... 205 cfm .500" exhaust ... 144 cfm Ideally you want your flow numbers to be in the 75 % exhaust to intake. Those heads are pretty close although your ports start restricting flow around .400" of valve lift. Your best best wold be a fairly sraight pattern cam with somewhat equal duration and lift in the mid .400" lift range and around 215-225 degrees at .050" duration. With a performer intake or something similar and a 600 cfm carb you'd be looking at around 325 HP or so. Running it through the desktop dyno I picked up 332 HP with a comp cams XE 268 and 378 ft lbs of torque at 3500 RPM using small tube headers and duals __________________ No truck :-(

12-28-2002, 10:29 PM	#6
67/72junkie Account Suspended Join Date: Oct 2002 Location: NC Posts: 1,129	heads They are 76cc and are good heads for street usage on pump gas .Make sure you have a set with a 1976 or later casting date so they will have hardened seats for unleaded gas.If not you will have burnt valves before long.

12-28-2002, 11:02 PM	#8
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	if you have them worked...valve job..tanked..new seats..valves ..retainers..springs ..seals..locks..you will be looking at over 300.00 and all you will have is a set of mediocre stock heads..if you do a bowl port job..thats 200.00 more..for a couple of hundred more you can get some nice aftermarket heads... __________________ 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

12-28-2002, 07:47 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	There were some light, and some heavy. As far as smogger heads go, these are some of the better flowing ones. Even the light ones will hold up OK...I had my light 882's (on my GMC with some porting done to them) up to 260 degrees once if memory serves. I lost a fan belt out on the freeway and I was doing about 80 - 85 MPH. They held up just fine. Not that I would recomend yankin off your belt to test them...

12-28-2002, 08:03 PM	#5
flyin99 creator of kong Join Date: Mar 2001 Location: Kentucky Posts: 538	A majority of the small blocks I have rebuilt for people, seemed to have 882's on them. They must have been very common. I also read somewhere, that they were considered "the best of the worst"...........

12-28-2002, 10:37 PM	#7
jmanz69 Careful, they attack... Join Date: Aug 2001 Location: Waterford, MI, USA Posts: 1,107	I have a set of these in my garage right now that I have been trying to get rid of for a while. I thought the were decent heads but I kept hearing that they were awful. I bought them cuz they were better than the 305 heads I had on. They are just empty castings right now waiting for new parts. Should I keep them and have them worked on or sell them cheap?



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