I would expect one of you classic guys may have an answer for me. I am doing up the top end on my 350 for my 85 1/2 ton.

Has anyone got any pics of the generation one small block Chevy 202 heads.

I have a 350 small block that I am rebuilding for my truck and I was talking to a guy who says I may have 202 heads which are good for a bit more power and better gas economy. I have no idea and I can't see any casting numbers on them.

The heads look like basic chevy heads with what is like a double valve spring. The outer spring is normal but the internal spring is a flat spring, the valve seals are the o ring type on the shaft of the valve.

The engine came out of a 3/4 ton 78/79 Chevy truck and it has a two bolt main crank.

If anyone has any pics of what 202 heads or a link that specifically shows what they look like I would appreciate knowing.

Thanks for any help.

 

I finally found through the search function a very good link.

My heads are not 202's.

http://www.angelfire.com/tx5/randysr...Headguide.html

which indicates to me that they are:

Large chamber (76cc), hardened exhaust valve seats, compromised intake port(‘71-’76 350/400cid), best of lightweight heads casting number 882.

I measured the intake valve at 1.94" and the exhaust valve at 1.5"

Since I have identified them can some one with good head knowledge put this into perspective for me, are these good heads, what kind of HP (potential) can I expect (ballpark) ??

76 c.c. is that good??

Any help form those with more knowledge than me is most appreciated.

 

I had a pair of "882" casting heads on the 383 that was in my '81 Z28, and my dad currently has them on the 350 in his '73 Camaro. While they aren't the best heads out there, they work just fine and IMO have a lot of potential for a street/strip machine.

Based on all the facts and figures I have to work with (comparing different cars and time slips, reading many mag articles on different build ups, etc.), and a little "educated guessing", I'd say that my 383 was making about ~350 HP and probably ~425 lb*ft TQ, while the 350 of my dad's is probably making ~375 HP at least, but maybe only ~400 lb*ft TQ.

We ran my '81 at the track but because of a fuel delivery problem, only ran 14.2. My dad's '73 has run a best of 13.6 to date, but we're having MAJOR traction problems with his car, so I know with a set of good tires and suspension work his car will be into the 12's easily.

I think with the right intake and cam, you can make 350 - 400 HP no problem using 882 heads on a 350. The larger 76cc chambers will limit how much compression the engine can make though, unless you run with pop-up pistons, so that's where most guys prefer running with smaller 64cc heads to get the compression. The higher the compression you run, the more power you can make (although the higher octane gas you'll require too ).

 

thnx, I am just looking for about 250 hp for my old Chevy 1/2 ton

 

You'll have no problem making 250 HP using the 882 heads you've got. Like I said about my old 383, it felt like it had enough torque to move a mountain, yet it was simply running with flat-top pistons and the 882 heads.

 

the pistons I have are flat top but they have the four half circle notches out of them two on each side across from each other.

What's with that are these good or just standard?

again thnx for the replies

 

those four little half circles are valve reliefs. They're probably good

 

I've got 882 heads on my car. Are you planning to use the stock intake and cam? Like Capn Pete said, they will work just fine, but of course there are plenty of other heads that are better. Mostly aftermarket, of course. I'm hoping to replace mine within the year.

 

Just building a 350 for a 1085 Chev 1/2 ton 2WD.

I want something to run good and a little hard but be good for winter.

Questions I do have are:

1) The two center exhaust ports are both supposed to be connected to the cross over passage head to head via the intake manifold?? Someone told me that only one of the center exhaust ports should connect and the other should not but that doesn't make sense to me because both of my heads are identical and I took a flashlight and can see plenty of light through the cross over port to both center exhaust ports.

The other question is do I need to use the restrictor pieces in my gasket set for the same exhaust cross over passage. My truck is for winter and it gets down to 40 below here in January.

 

I think my crossover passage went to both center ports as well, but don't quote me on that. As far as I know you shouldn't need to use the restrictors. Make sure your intake gaskets have an opening for it, though.

 

i will make sure thnx