NOS cam questions

while i have motor out to fix the oil pan leak i may want to go with a different cam for moor nos.i have been told as the motor sets now with a different cam that has moor duration on the exaust the car should go 5.20's fairly easy.im not a cam guy so i dont know if this true or not.the word is moor duration will not hold as mutch heat in the motor and will help elemonate top ring land failure with the bigger nos setup.what i do know is if the nos setup is too rich on the fuel and it gets under the ring lands it will cause a failure,this happned in my buddys small block.

the current cam i am useing now:

pt# 34-000-9

lift .787in .769ex

duration @.050 280in 292ex

lobe seperation 112

The answer is....do you a cam that is a slug w/o spray and how much spray are you using?

at this time i am on a 200 shot and want to go up to 400shot gradually.i am not in to bracket racing all motor these days im done with it,it's too slow for me.

i am aware that the cams are or seem to be a slug all motor but when the nos is turned loose those mothers get er done!

Larry T wrote:at this time i am on a 200 shot and want to go up to 400shot gradually.i am not in to bracket racing all motor these days im done with it,it's too slow for me.

i am aware that the cams are or seem to be a slug all motor but when the nos is turned loose those mothers get er done!

In that case....A little more on the intake dur. and more so on the exh. dur + a wider LSA...i.mo.

ok next question:the rings are set up for 250 shot i probably should put a new set of rings filed for the 400 shot?

what bore and what are the gaps now, also coated pistons or standard gas ports?

no gas ports and no coating.their was a paper that came with the rings but i cant remember the formula,im thinking .025/.028 not sure.


hell i dont know if i should change the cam or not maybe im over thinking things.the motor likes the 200 just fine and i havent hurt anything so far so maybe a 300-350 max wont be a bad thing.

Lem gave you his imo

Larry T wrote:no gas ports and no coating.their was a paper that came with the rings but i cant remember the formula,im thinking .025/.028 not sure.


hell i dont know if i should change the cam or not maybe im over thinking things.the motor likes the 200 just fine and i havent hurt anything so far so maybe a 300-350 max wont be a bad thing.

id say (but im no expert) watch the plugs and put it to her , i believe that is going to be the next big wall that i hit is " the cam " ....i was going to go back out this weekend but rain is on the forecast .


good luck larry , you are making great progress

those rings are tight IMO, watch the fuel and the timing good luck

i found the info on were we set the rings .036 top ring and .024 on the 2nd ring.