K I have a Few ?s
1. You have the Choice of Angled or Straight plug, Im gonna be running Long Tubes, what do I need?
2. 64cc or 72cc, they say this is the port size, If Im gonna be using a LT1 intake, do I have a choice with either one?
3. Choice size of 200cc, 215cc and 230cc, wouldnt I want the biggest one for better flow?

Sorry but I know jack shiznit about heads!!

 

you should tell us a little bit about your setup.... such as motor, if your going to be using it on the street/strip... any and all info you have about your setup will only help make things easier for everyone.

 

im retarded, your a senior member so i am sure that SOMEONE knows your setup. pay no attention to the weirdo in the red 82.

 

its a done up 350 on alot of spray Thats all I really want to say, just so I can keep my setup on the DL.

 

1. Straight or angled has little or nothing to do with headers, although some headers will fit better with one style than the other. THe reason for the angled plugs is to position the plug electrodes in a better place for igniting the charge.

2. Those 2 numbers refer to the combustion chamber size. You should use whichever one makes your calculated compression ratio come out to about 9½-10:1 for iron heads, and around 10½:1 for aluminum heads.

3. Port size indicates flow capacity. Big ports are good for high-RPM horsepower, bad for low-RPM torque. You should consider the rest of the motor and its RPM potential when selecting this. If you're running a street 350 with a dual-plane intake or TPI or TBI or any other induction system that limits RPMs to below 6000, anything past 200 cc intake ports is overkill and probably will actually slow the car down.

 

RB8 thanks for the Reply, I will have a LT1 intake and will be Sprayin around 200, what do you recommend? I would like to jack my compression up, so I assume I should go with a 72cc?

 

in my experience, angled plugs are the way to go if you have headers. the headers can be a pain in the **** because sometimes they hide your spark plugs underneath them and it makes it tricky to get them out. i think that 200cc heads are the largest you would want to go with a 350 because the the higher cc (200cc, 215cc, etc) you go, the less velocit the air/fuel mixture will have in the lower rpms (therefore, you will have less low rpm torque). most people would tell you that 200cc is probably too big also, and they are probably right. im not sure what your compression ratio is but the chamber size can raise it, lower it, or not change it depending on what heads used to be on the motor. if your running lots of juice, i would suggest trying to keep the compression ratio kinda low. its kind of hard for me to say what chamber size you need without knowing the compression ratio that the motor has now. but maybe i can explain this decently

if you have 10:1 compression and have 64cc heads, and you want to lower the compression roughly to ~9:1 go with the 72cc heads. and the opposite if you want higher compression (in your case i dont think so)....but if you have 8.5:1 compression w/72 cc heads and want to raise it to ~9.3:1 go with the 64cc heads. If you dont want to change the compression ratio and have 72cc heads, go with the 72cc heads, etc...... I hope i havent confused you. If i have, be patient and someone else will answer your questions.

 

yeah what he said, im slow today. :lala:

 

Thanks you guys!!:hail: :hail: :hail: :hail: :hail: :hail: