Thread: cam help/ideas/advice

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when we people around here talk cams, we mean advertised duration, and by the way you can make more power using open chamber heads (less valve shrouding) just have the heads milled to the desired compression ratio.

Originally Posted by steelsixpack101

when we people around here talk cams, we mean advertised duration, and by the way you can make more power using open chamber heads (less valve shrouding) just have the heads milled to the desired compression ratio.

no i do not who is WE? mill the heads down to what a small chamber then were will you be ? in take valves hanging down past the deck?? been there and done that . if this is a dish piston 454 it will have no CR .the heads he has will work ok with small valve the big block heads are canted so they move from the chamber walls when open yes you could run the 781/049 mill the heads . put the piston.010 in the hole to the deck run a steel shim head gasket run a bigger cam ??? you will have no pistons to valve why?? you just cut it all off the deck AND heads now the in take valves are haning down in the hole ??the bore size will help any head work better and if he works on the ex headers / X cross .and intake and cam with the heads he has with a re cam it should be it 370 hp +? so at this point i still do not know what he wants to do?? not do any thing to it is what i get. just a recam? if so. not rework the engine. then i would run the marine/ Rv cam in it call it good .or buy a 598/638 pump gas engine from me

when we people around here talk cams, we mean advertised duration, and by the way you can make more power using open chamber heads (less valve shrouding) just have the heads milled to the desired compression ratio.

We people?? HHmmm.. Thats the first I have heard that. And that's not true about open chambers, you can make tons of power with closed chamber heads, it depends on what else you do with the chamber as far as porting, unshrouding, etc...Milling the heads can only be done so much, then, as Pat said, you get into p/v clearance issues, intake not fitting, etc...a whole host of problems. Open chamber heads only came around because they supposedly run 'cleaner' on the smog engines of the early 70's...it was done for smog reasons, not power reasons.

Originally Posted by 1JohnnyO

We people?? HHmmm.. Thats the first I have heard that. And that's not true about open chambers, you can make tons of power with closed chamber heads, it depends on what else you do with the chamber as far as porting, unshrouding, etc...Milling the heads can only be done so much, then, as Pat said, you get into p/v clearance issues, intake not fitting, etc...a whole host of problems. Open chamber heads only came around because they supposedly run 'cleaner' on the smog engines of the early 70's...it was done for smog reasons, not power reasons.

oh yes i made good power with close chamber head s

you know when i meant "we people" i actually meant it as people from around where i live. i could care less how you guys go about figuring cam specs. as far as the heads go, depending on what year the 454 it is, it probably already has open chamber heads. there weren't too many 454's that had the closed chamber heads, but i sure you guys already knew that,right? as far open chamber versus closed chamber, i never said you couldn't make good power with closed chamber heads- you can. i just said the open chamber heads are better for making power than closed chambers heads. just look at every big block chevy aftermarket head-brodix-edelbrock-dart-AFR-canfield- world products. everyone of them has a open chamber design,i wonder why? also when it comes to milling, I have milled 781 cylinder heads .080 off the deck and ran a cam with close to .600in valve lift. I never had any problems. i'm sure this guy with his 454 can get way with milled cylinder heads, thin gaskets and a smaller duration cam! wow! as smart has you guys are about the chevy big block i thought you would of know more about the history and developement of this family engine. johhny0, your right on that,one reason why chevrolet went with open chamber heads is better emmisions, theres also another reason why, less valve shrouding. and actually chevrolet did dyno testing on the 454 , they used closed chamber head in one test and open chamber head in another test and despite the compression loss, the 454 with the open chambers made more horsepower. even if he did put a cam in he would probably would want to increase compression in the first place, just my thoughts on your little s***pile. and also when i did reply to the fellow with the 454, meant to reply to him, not you.
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Originally Posted by steelsixpack101

when we people around here talk cams, we mean advertised duration, and by the way you can make more power using open chamber heads (less valve shrouding) just have the heads milled to the desired compression ratio.

No one that builds engines talks about cam's in terms of advertised duration.
The reason is every cam company is different.
I do "roll" the heads meaning that I angle mill them.
Yes,in the small block Chevy after-market heads you can pick up hp doing this.
One because it will raise your compression and two because it will change the angle of the valve as it relates to the cylinder head.