I have a 74 350 in a 83 camaro, the motor has the stock 882 heads with 76cc chambers. I have a pair of 64cc l98 heads laying around. If I put those heads on it what will the new compression ratio be. Stock I think it is like 8.5.
Thank you

 

low 9s

 

Yeah I would say about 9:1 or so with those dished pistons. But youll get a pretty nice performence gain from the swap those 882 heads suck. Good Luck.

 

Ya i hope i can get better performance, im only looking for about 250hp. I seen one flow test that said tha the 882 out flowed the l98. Is that true?

 

Ive seen tests that say that also, but I dont see how. Either way the small amount of flow they supposedly have over the L98's isnt worth a crap because of the crappy compression those 76cc chambers give you. If they really flowed that well I think they would be a little more in demand. I saw them collecting dust at most of the machine shops I went to when I was looking for my heads.

 

Well, if you gave us more info we could tell you exactly what the C/R is.

Auggie

 

Flow numbers only tell one little piece about how well heads will make a motor run. In all honesty, if head choice was that one-dimensional, there'd be a hell of alot fewer kinds of heads in the performance world than there actually are.

Every motor I've ever taken a set of those off of - every single one, no exceptions - and put a set of 64cc heads on, ran better. Usually ALOT better. Sometimes so much better that I was accused of making other changes at the same time. One of my favorites was my wife's car that she had up until a few months ago (maybe 200 months or so); it was a 74 Monte Carlo, with a 400 (2-barrel of course). It was a pig. It developed some sort of a malfunction in about 79, that indicated a need to pull the heads, besides just their casting number; at the time I had, as I always did and still do to this day, a set of 186s in stock ready to run, so I just stuck those on there instead. No other changes whatsoever - same cam, intake, carb, exh manifolds, emissions was all still there, etc. She couldn't believe the difference. The car didn't even sound the same sitting there idling. And it felt like it had about 25% more horsepower. From a set of heads that some people say doesn't flow as well. Go figure.

GO ahead and make the change, you'll be glad you did, I can guarantee it with absolute iron-clad certainty.

 

Ok cool, When I change the heads im also putting in a edelbrock performer cam and performer intake with a holley 650.

How do you think that will do.

 

Avoid the edelbrock cam. It is old technology. The ramp rates are painfully slow as opposed to the newer designs that can be found in the Xtreme Energy grinds from Comp Cams or the Crane Powermax grinds.

On top of that, IIRC, the edelbrock cams are single pattern designs. You have factory heads, and like all heads, they have a poor I/E ratio and benefit from the split duration design, again, the Xtreme Energy or Powermax cams. Both carry a larger exhaust duration to keep the exhaust valve open longer to help compensate.

 

Yeah go with the comp XE256 or XE262 cam they are both very streetable and make great torque. They will work great with the L98's. You may have to get better springs for them though. Also if you dont have emissions(I doubt you would use a holley 650 if you did) use the Performer RPM intake its way better than the performer. Add all these parts together with a high flow exhaust and you have a pretty stout street car. Good Luck.