882's

[smoked68]

I bought some 882 heads the other day from a guy that said they came off of a running truck and took it to the machine shop to have bigger springs and bigger valves put in. My engine is a 4 bolt 350 Crate engine that has a mild cam and the stock heads with a 600 edelbrock carb. My questions is how well will this combo (below) waken up the engine when I get it put on? Already have everything just need free time. The engine is fairly stout now but it obviously needs more power so Im hoping this will be very noticeable...what do yall think? Thanks
none of the items below are on the truck yet
-Engle Cam 494 232/284
-Edelbrock thunder series 650 w/ electric choke
-882 heads with bigger valves
-Edelbrock Performer RPM Intake

[lilpup69chevy]

882 heads are decent you're not gonna notice much of a gain with them though they aren't performance heads you need some more flow like a double hump or a vortec head or something similar 882's should have 75-76 cc's and 194, 150 valves

[smoked68]

There are alot of heads that I would rather have had than the 882's but I picked them up for $50 bucks so I was happy. Still going to be better than the stock heads. Btw putting 202 valves in...

[VetteVet]

I have a set on my 74 vette and it runs pretty decent. Gm used them on most of the 72 through 80 vettes. They are prone to cracking between the valve seats if the engine ever overheats. I would never put larger valves in these heads for that reason. they are referred to as smog heads and probably are the best for that era. In my opinion they would work great in a stock or mild performance engine, but with 76cc chambers it'd be hard to get higher compression. My vette is rated at 8 to 1 with dished pistons. I've got flattops in it now and I think they will help a lot.

[Billla]

Originally Posted by smoked68

I bought some 882 heads the other day from a guy that said they came off of a running truck and took it to the machine shop to have bigger springs and bigger valves put in. My engine is a 4 bolt 350 Crate engine that has a mild cam and the stock heads with a 600 edelbrock carb. My questions is how well will this combo (below) waken up the engine when I get it put on? Already have everything just need free time. The engine is fairly stout now but it obviously needs more power so Im hoping this will be very noticeable...what do yall think? Thanks
none of the items below are on the truck yet
-Engle Cam 494 232/284
-Edelbrock thunder series 650 w/ electric choke
-882 heads with bigger valves
-Edelbrock Performer RPM Intake

Here's a link to the stock flow numbers for the head from the Car Craft database; all this stuff is true in my experience. Moving up to 2.02/1.6 valves helps...but without knowing what heads you're swapping FROM it's kinda hard to say what type of power increase you'd see. Bigger valves really only help if you hog the chamber to make sure they're not shrouded, and Car Craft noted that you also need to do the work on the short radius (path from the bottom of the port to the inside of the bowl underneath the valve) to help with the flow...just like every other stock Chevy head on the planet

http://www.carcraft.com/techarticles..._882_head.html

The 1025-H cam w/.494 lift is a pretty hefty lift cam - for any cam over ~.450 lift you need to check for coil bind, retainer clearance, rocker/stud clearance and finally valve/piston clearance pretty carefully. Are your springs rated for that much lift?

The 650 carb and RPM intake won't buy much with the flow you'll get from the 882s...but they're pretty Even at 90% VE a 350 won't use 650 CFM until 7100 RPM.

Note that the cam and the RPM intake are made to make power at the higher end of the RPM range...so you'll give up low-end torque for high-end HP...be sure this is what you want.

I would expect to see ~20 HP with this upgrade, but that's just a guess without knowing your current cam and intake.

[smoked68]

The 1025-H cam w/.494 lift is a pretty hefty lift cam - for any cam over ~.450 lift you need to check for coil bind, retainer clearance, rocker/stud clearance and finally valve/piston clearance pretty carefully. Are your springs rated for that much lift?

The springs that I am putting are good for up to 550 lift and our engine guy said that we would be good on everything with this cam because he knows our engine setup. Hopefully he was right and I wont have a problem.

[Billla]

Originally Posted by smoked68

The 1025-H cam w/.494 lift is a pretty hefty lift cam - for any cam over ~.450 lift you need to check for coil bind, retainer clearance, rocker/stud clearance and finally valve/piston clearance pretty carefully. Are your springs rated for that much lift?

The springs that I am putting are good for up to 550 lift and our engine guy said that we would be good on everything with this cam because he knows our engine setup. Hopefully he was right and I wont have a problem.

Cool :-D I would still definitely check this if you're doing the swap/final ass'y - doesn't take very long and definitely peace of mind

[cooters]

way to much cam for the combonation. Unfortunately that motor will not make any torque.

[smoked68]

I dont need an engine that makes alot of power. just decent power and I want it to sound like it makes alot of power. I wanted a cam that hit a really hard lick and this is what the guy recommended. I don't plan on drag racing and I barely have any traction as it is so alot of power wouldn't do much good anway.

[Billla]

I'd have to say if that's your intended usage then you're not spending money in the right place. The heads really aren't a signficant upgrade from your stock heads given the usage, and that cam is wrong for what you want although it will be lumpy. What you're getting with these swaps is worse driveability, far worse milage and likely less power under 5000 RPM.

I would upgrade your cam in place with one of the CompCams milder 4x4 cams (< .450 lift), a good set of headers, do some tuning work on the ignition and carburation and let it go at that. You'll have something that sounds GREAT and runs great...and has a genuine increase in power.

IMHO, a rumpty cam that can't back it up when the long pedal on the right is pushed can be downright embarassing on the street.