[chevymastermind]

I have a set of Chevy heads with a casting number of 333882, with 1.94 Heads, i am hoping to make 350-375HP with them. the engine is a 350 Steel crank, 4 bolt main, 9.5:1 compression ratio with these heads, comp cams .480/.480 lift with 230/230 Duration at 0.50, 600cfm edelbrock carb, Performer RPM intake, headers with Flowmaster 40 series mufflers dumped befor rear end, and 1.5 ratio roller rockers. i just want to know if these heads will be good for my engine before i pay to have P.E.D. Rebuild the for $450?

also give me your general opinion of these heads.

thank you.

[327NUT]

Before I spent $450 to have a set of stock heads rebuilt I would spend a few extra bucks and buy a set of vortecs. I also think you are under carb'd, I would run at least a 650 Holley to keep up with that cam and the vortec heads (if you choose to run them). No opinion on the 882's, never owned a set.

[CNC BLOCKS NE]

As 327NUT said the Vortecs are the way to go but to run that cam with a new set of Vortecs re quire then to be reworked as I believe there is a max lift of .460

Those 882 heads are just a 76CC stock truck head that were never built to use in performance applications ands they have no harden seats either.

[BOBCRMAN@aol.com]

882's do have hardened seats!. That is one reason they are so crack prone. They were one of the first of the factory hardened seats and before GM induction seat hardening was perfected.

882's are the "Best" of the worst heads. They are the heavy weight casting. As noted, they are crack prone thru the center exhaust seats. They will flow fairly well if the intake side is port matched and the upper part of the exhaust port is blended. Bowl work is also needed, as is the case with most Chevy production heads.

There are actually three series of these castings. One has large clean intake runners and excellent bowl cutting from the factory and 1.94 intakes. Another has terrible intake runners, bowls. seat area. The third is a 1.72 intake, 3/8" stem exhaust valve head that was used on 2bbl. truck/pass car applications. I actually prefer these castings. As, they are seldom cracked and I have to cut them for guides and big intake valves anyway.

[underdog305]

Its easy to increase the lift potential with the Vortecs. Install the comp cams beehive springs p/n CCA-26918-16. There a lil pricy @ $180.00, but you can get .600 lift without a problem. You'll need to install threaded studs though to handle the spring loads though.

[CNC BLOCKS NE]

Originally Posted by BOBCRMAN@aol.com

882's do have hardened seats!. That is one reason they are so crack prone.

I willl argue with that one as those OLD heads were produced from 1970 to 1980 and DID NOT HAVE INDUCTION HARDEN SEATS. As most of the 624 castings that are the light weight casting which are prone to crack and have harden seats. And over the years we have put enough seats in those 882 heads do to the unleaded fuel.

An easy way to tell if those heads have indution harden seat is to look where the exhaust manifolds bolt on and if they have 7 bolt holes or the pad for the extra bolt hole they will have the factory harden seats which I believe came out in 83 or 85. And as far as I know there were no 882 with that bolt pattern that I have seen. HMMMMMMMMMMM


Carl

[CNC BLOCKS NE]

Originally Posted by underdog305

Its easy to increase the lift potential with the Vortecs. Install the comp cams beehive springs p/n CCA-26918-16. There a lil pricy @ $180.00, but you can get .600 lift without a problem. You'll need to install threaded studs though to handle the spring loads though.

Becareful using a spring that is rated at .650 lift as @ 1.800 it has 130 seat pressure and at open load @ 1.150 is only 333 pressure over the nose which .650 lift and using a cam that only has 480 lift your over the nose pressure would be very weak and would cause valve float. Here is the link for those springs.http://www.compperformancegroupstore...egory_Code=BEE

We have used the Isky 235-D spring which has 135 at the seat @1.750 and is good for 550 lift and we have had very good luck with these springs as you can use the stock Vortec retainer and you don't have to cut the spring pockets either. Carl

[Jmark]

I'm currently running a set of 882 heads on my 350. I pulled some 993's off and one was cracked! Go figure. Had a spare set of good 882's and port matched them and did some short leg work and opened up the intake valves too. Personally, I doubt you'll get close to 350 horse but maybe. 300 might be a fair guess.

Here is some good info on GM head flow numbers.

[BT74]

Originally Posted by CNC BLOCKS N/E

I willl argue with that one as those OLD heads were produced from 1970 to 1980 and DID NOT HAVE INDUCTION HARDEN SEATS. As most of the 624 castings that are the light weight casting which are prone to crack and have harden seats. And over the years we have put enough seats in those 882 heads do to the unleaded fuel.

An easy way to tell if those heads have indution harden seat is to look where the exhaust manifolds bolt on and if they have 7 bolt holes or the pad for the extra bolt hole they will have the factory harden seats which I believe came out in 83 or 85. And as far as I know there were no 882 with that bolt pattern that I have seen. HMMMMMMMMMMM


Carl

I have a 74 L82 that came from the factory with 882's, and the owners manual states that the engine is designed for leaded AND unleaded gas. As for hardened seats coming out in 83 or 85.....catylic convertors were required equipment in Ca. since 1975, (therefore unleaded gasoline) so what kind of seats were used with the unlead for the 8-10 year in the mean time????(my 74 still has the original 882's and have never had a valve problem in the last 32 years).

[Rhansen]

My last small chevy had 882 heads and while I didn't go to any great lengths to make that engine a performer, according to my timeslips (14.05 at 98 mph in a 3165# vehicle) it made 285 hp at the crank. Could prolly make over 300 horse with those heads but for the $450 you say they need in work I would recommend getting a different set of heads.

[CNC BLOCKS NE]

Originally Posted by BT74

I have a 74 L82 that came from the factory with 882's, and the owners manual states that the engine is designed for leaded AND unleaded gas. As for hardened seats coming out in 83 or 85.....catylic convertors were required equipment in Ca. since 1975, (therefore unleaded gasoline) so what kind of seats were used with the unlead for the 8-10 year in the mean time????(my 74 still has the original 882's and have never had a valve problem in the last 32 years).

You must really have a rare set of 882 heads as we have been in this bussiness for 32 years have not seen a set yet with induction harden seats as we don't see many of those heads but one of the local jobber shops does a ton of those and I know he is always putting seats in those heads.

[topfuel]

I'm afraid I'm going to have to agree with everyone else on this CNC. I have been an automotive machinist and engine builder for the last 21 years and every 882 I've ever seen has hardened exhaust seats. GM began changing engines over to be compatible with unleaded fuel in 1974.

I have fixed more 882 heads than I care to remember. The center two exhaust seats are the most prone to cracking. Personally, I believe this is due to both center exhaust bowls being open to the exhaust crossover. This seems to put a lot more heat in the center of the head.
Also, the 882's were installed on Chevrolet engines from 1974-1980. Before that Chevrolet used the 993, 487, 336 and 997 castings used from 72 to 84 on the lower compression engines.

I agree with the "best of the worst" comment. If a larger combustion chamber is wanted or needed, consider the World S/R series which are available with a 76cc chamber.

Barry

[steve t]

i read that 882 heads are not that good for hp cars, infact the book say throw them in the dump,that being said i did run a set for years on a mild street car with no problem

[CNC BLOCKS NE]

Originally Posted by topfuel

I'm afraid I'm going to have to agree with everyone else on this CNC. I have been an automotive machinist and engine builder for the last 21 years and every 882 I've ever seen has hardened exhaust seats. GM began changing engines over to be compatible with unleaded fuel in 1974.

I have fixed more 882 heads than I care to remember. The center two exhaust seats are the most prone to cracking. Personally, I believe this is due to both center exhaust bowls being open to the exhaust crossover. This seems to put a lot more heat in the center of the head.
Also, the 882's were installed on Chevrolet engines from 1974-1980. Before that Chevrolet used the 993, 487, 336 and 997 castings used from 72 to 84 on the lower compression engines.

I agree with the "best of the worst" comment. If a larger combustion chamber is wanted or needed, consider the World S/R series which are available with a 76cc chamber.

Barry

Barry

So far the ones we have seen we have had to put seats in and maybe they were the earlier ones. Most of our work is performance related and a 882 is not a common head at our shop.

[gofastz]

Originally Posted by chevymastermind

I have a set of Chevy heads with a casting number of 333882, with 1.94 Heads, i am hoping to make 350-375HP with them. the engine is a 350 Steel crank, 4 bolt main, 9.5:1 compression ratio with these heads, comp cams .480/.480 lift with 230/230 Duration at 0.50, 600cfm edelbrock carb, Performer RPM intake, headers with Flowmaster 40 series mufflers dumped befor rear end, and 1.5 ratio roller rockers. i just want to know if these heads will be good for my engine before i pay to have P.E.D. Rebuild the for $450?

also give me your general opinion of these heads.

thank you.

I currently have a 350 sporting some 882's i had layn around, my 350 is 60 over with flat top pistons, with a 280/280 480''/480'' lift @ 230 comp mag bumpstick, with a cast crank and X rods and the 882's milled down to have 64cc combustion chamber and springs and valves to push my motor to 10.0:1. Yeah i have $480 bucks in them, and yeah i couldv bought some vortec heads, but if you think about it the vortec has 170cc intake runners and the 882's has 160cc intakes, if you do the work on them they would be so close you wouldnt feel the differents! i can say you can get 400hp with this set up with vortec heads, so my 882's are close so i'm not scared to say that i'm not to far away from 400hp with my $480 882's!