[jlighthart]

I would like to increase compression in a recently purchased SBC 350, block#3970010, VO511CKW, with Head# 333882, 1.94/1.5--76cc, 4" plus Flat top pistons w/4ea valve reliefs on each piston, 8" balancer balancer (internal balanced).

What 58-64cc GM part# head would you recommend and what head gasket thickness should I use? I will be street using this engine and want it stronger, but don't want to over stress the bottom end of motor.

Advance thanks for all information!

John

 

[novaderrik]

if it's just a street engine, get either a set of vortecs or some of the cheaper cast iron street heads out there.
the vortecs will need the matching intake, slotted rocker arms, and center bolt valve covers or adapters to use your stock valve covers. but they are good heads.

 

[wiskeesour]

You could use your heads and just mill them down to around 62-68cc's but at least port the exhaust to around 75-80cc's helps scavenging of the exhaust on small valved heads...go to your local machine shop and ask them if they have any 462 heads laying around. Most do. bowl blend and pocket porting with a stock cam and .035 head gasket it would run very nicely. If you get a larger cam, stay around .470-.480 lift and stay under 230* duration. Car should run pretty hard for a street car. This is close to what I just worked on for a friends 4X4 CJ. REALLY TORQUEY....

 

[Dave Burlingham]

John:

I concur with Nova and Harley, I am also in the process of rebuilding my 350. I have 462 heads (64cc) on mine and will keep these. They are upgrading the valve seals to handle the unleaded gas of today. I am also changing the cam to give the engine a little more "attitude" at the lights. I am putting in a 350/350hp OEM cam and staying with the Q-jet carb just having it set-up a little differently. The car is built as a cruiser for the highway , powerglide and 2:73 rear end and that is how I want to keep it. Based on what I am being told by the machine shop doing the rebuild, I show see somwhere around 320 to 335hp with just the change in the cam. Good luck and have fun!

Dave

 

[jlighthart]

I have found both 462 and 461 heads w/64 cc chambers. I know you have recommended 462's, but if I could pickup 461 heads instead would they work?
Thanks;
John

 

[Dave Burlingham]

John:

If you are referring to part numbers 3782461 and 3890462 than yes either set should be fine. If you can find them from 66 -70 they will all have 64cc chambers, 66-67 had no accessory holes and the 68-70 did.

Dave

 

[jlighthart]

Thanks;

Once again great information.

 

[67 Plum]

Might want to check out a little more the 882s flow as good as the 462s and 461s in stock form with the 1.94 and 1.5 valves.All you are gaining is comp.Depending on the rest of the engine combo you may gain very little in the seat of the pants dyno.

 

[pdq67]

W/ 64 chamber heads, he's going from somewhere around 8.75 to 1 up to about 10 to 1 if he use's Mr. gasket .020" shim headgaskets!

So the old -882 heads and I figure along with .039" thick composite headgaskets won't help at all here b/c he's gaining at least 1.25 points of compression!

Add one CC 268HE or 270 Magnum hy-cam and go!!

pdq67

 

[Camaro67_rcl]

Are all 462's 64CC ?

 

[Dave Burlingham]

Unless someone has reworked them, all 462's are 64cc.

 

[pdq67]

Suppose to be, that's why I always say to cc all stock heads so you will know for sure.

pdq67