The 214/224 cam is extremely mild. Will idle at 750rpm at ~18in of vacuum on a 383. The 224/236 is also very streetable, but not quite as torquey down low. ~13in of vacuum at idle. The 214/224 will peak at ~5,700rpm the 224/236 at 6,200 or a bit more.

Rich Krause

 

ok rich thanks.....i guess basically here is the plan for the motor then.... pontiac formula 1995 355ci 6 speed 3.73 gears, 1.6 roller rockers,comp cams pushrods,keyed crankshaft hub,3angle valve job on stock lt1 heads,52mm tb,random technologies dual cat y pipe,flowmaster cat back,24lb bosch injectors,eagle connecting rods,srp pistons and rings..aprox 10.4 to 1 compression ratio, ati p600b 8 psi with front mount intercooler,msd 6al,msd power coil,ls1 driveshaft, and one of the comp cams you suggested...just wondering with my mods....if it be wise to goto 6200 rpms or not..if not.....the compression ratio is around 10.4 to 1..basically what it was before the rebuild...thanks a ton for the help





Steve

 

FYI, you will gain ~.15 points in CR with the ovebore. With the 1.6 rockers the larger cam is going to be pretty high lift for a street HR cam (over 0.600"). You might be better off with the lower lift versions of the same lobes. #3314/3316 gives the same duration but .544/.555" lift vs. .605/.624".

With your CR, as opposed to the 116LSA/112ICL I usually recommend with this cam, you may want to use a 116ICL to bleed off a little dynamic compression and help avoid detonation.

As far as which cam, the smaller cam is great and may be all you need/want. But with 3.73's I think you will like the bigger of the two.

Rich Krause

 

Rich forgive me..but i got a bit lost lol im not a mechanic nor do i claim to know much about cams..and their profiles etc.. are you basically saying either cam will do...and basically where can i find the cams your describing....just call comp cams again? is it a custom grind your saying i should get....im sorry if im not fully understanding this...tryin my best.. take care and thanks for your time






Steve

 

They are "custom" cams, but anyone can get them for the same price as an "off the shelf" cam. Usually takes Comp 3 days from order to shipping. You need to specify the core (just the year and model will do), the lobes to be used, the lobe separation angle and the intake center line.

Yes, either will work. The smaller cam may not actually give up much hp with a blower, but the rev range will be lower. You will thus loose torque multiplication from staying longer in the lower gears and it will not be as fast. The smaller cam will accelerate harder in the mid-range (typical street use). OTOH, with a stock bottom end, you may prefer to keep the revs below 6K, in which case the smaller cam is a better choice.

Cams illustrate TINSTAAFL (There Is No Such Thing As A Free Lunch) as well as anything in life

Rich Krause

 

ok so rich if i go with the smaller cam, what are the cam specs you recommend...ie.... im gonna be like a parrot and just regurgitate the specs to comp cams for them to make the cam.....if your in rochester sometime let me know....i at least owe ya a lunch or somethin heh take care and thanks for tolerating all my questions






Steve

 

Your compression ratio of 10.4:1 is too high. Try to get it down to around 9:1.
Ed

 

eds thanks but how can i lower compression? im tryin to keep this ...as cheap a upgrade as possible.....are you saying i cant run that motor at 8 psi... at 10.4 to 1 compression? this stuff..i wish i knew more about motors heh.....thanks for the help..

 

SteveLT1, If you want to lower compression which would be smart, you can get dished pistons or if porting the heads you can open up the combustion chambers. FWIW lowering compression on a blown motor won't lower your HP much at all but will keep your motor from going Kaboom and easier to tune.

 

rcf925 i hear ya but already bought the pistions..i couldnt find pistions at 9.5 to 1 compression for my size chamber heads etc...could i reduce the compression with a thicker headgasket..or...something...this the whole engine rebuild went father than my dollar can stretch already...so im sorta in a pickle...im really concerned about gettin the right cam at the moment...go figure i call comp cams..tell them what i have in mind..and suggested a lame *** cam...i should of done better research not blaming them but...such is life..ive learned alot for better or worse lol




Steve

 

8psi may not be too much at 10.4:1, but it certainly will be without hella strong pistons!

But back to cams, tell them that you are ordering an hydraulic roller cam and what year/motor the cam is for to get the right core. Then, specify the lobes (#3190/3192), the LSA and the intake center line. Until you decide on CR, I can't recommend a specific LSA and ICL.

Rich Krause

 

You don't really want a thicker head gasket with a blown motor. Since you are allready doing some headwork check into some porting , specifically opening up the combustion chamber.

 

ok rich... well id like the compression ratio to be around 9.5 to 1...the srp pistions..with the stock 58cc combustion chamber is 10.4 to 1...i'll have to look into some porting i guess...i was tryin to find pistons...that would be around 9.5 to 1 compression..but couldnt with the stock heads. i found 9.0 to 1 .or 10.4 to 1...i opted 10.4 to 1 perhaps i shouldnt have...i was running 10.3 to 1 compression before i did the rebuild...with stock internals..would running 10.4 to 1 on 8psi really be that much of a problem? if so i guess i'll do more headwork then








Steve

 

The srp pistons i got...are 10.4 to 1 compression with a 58cc head 9.8 to 1 with a 64cc head and 9.2 to 1 with a72cc head i just had a 3 angle valve job done on the heads...will that have to be redone now if i had the combustion chamber opened up? i should of planned this better...








Steve

 

I havent read all the posts to this, but... isnt it a bit mis-leading to rate con.rods by horsepower? Dosent engine RPM have a huge factor in this? Piston weight? Usually rods break in tension...correct?

-Rich: How come no mention of CC-218-230? This is the cam I run and works excellent for me. Nice sound but more imporantantly...great driveability....I drive this car everywhere.

-take care all.