Cam decision*

C-Bo · 07-02-2009, 01:56 AM

Currently I have a sbc 350, bored .040, 4 valve relief hypereutectic pistons, stock rods, stock crank, 441 oe heads (surface milled, 2.02/1.60 valves), cam is unknown(hydrolic flat tappet), edelbrock rpm air-gap intake, holley #4777 650dp.

I know the cam is way too big for this combo (around 8.3:1 compression).. I believe the cam is something like a comp 292h, just not sure.

The engine was recently installed in my 92 2dr 4wd tahoe and is gutless! The tahoe has a th-350, 3.73 gear, around 1500 foot brake stall and 275/55r20 tire (tire size will be changed soon, 30-32in tall).

My Question is what would be the best performing cam shaft for my application? I tried to give all info.. Please only refer cam choice if you have had experience with similar build..

PrettyRicky · 07-02-2009, 03:57 AM

as far as h.f.t. cams are concerned a comp xe250h(12-230-2) would serve you jus fine, w/ ur set up and full exhaust u'd see mid 300hp around 5k and low 400tq around the 2500-3000 rpm range so that'd be great w/ ur stall etc. tho if u were to up the stall and keep the gears u could run w/ a little more cam and get better performance and have more pwr to play w/.

if u were to spend the extra money one a h.r.(hydro-roller) cam u could go w/ a 252xfi(12-464-8) and see high 300hp around the 5k range and mid-high 400ft lbs around teh 3.5k range all day long, keep the stall that u currently have and have a blast

Paint Guy · 07-02-2009, 09:27 AM

Quote: Originally Posted by PrettyRicky

as far as h.f.t. cams are concerned a comp xe250h(12-230-2) would serve you jus fine, w/ ur set up and full exhaust u'd see mid 300hp around 5k and low 400tq around the 2500-3000 rpm range so that'd be great w/ ur stall etc. tho if u were to up the stall and keep the gears u could run w/ a little more cam and get better performance and have more pwr to play w/.

if u were to spend the extra money one a h.r.(hydro-roller) cam u could go w/ a 252xfi(12-464-8) and see high 300hp around the 5k range and mid-high 400ft lbs around teh 3.5k range all day long, keep the stall that u currently have and have a blast

+1. agreed

PrettyRicky · 07-02-2009, 01:36 PM

and w/ both of those cams, h.r. preffered, and a good tune(carb or f.i.) you'd see very decent daily drivable gas mileage as well.

solenoid · 07-03-2009, 03:31 PM

Over camming is easy to do ,and usually brings undesirable results espeacially on low comp motors .Ive had really good luck with the comp cams 268 on torque based low compression motors.Nice idle and good low end torque.If your running a flat tappet cam i would try that.

PrettyRicky · 07-03-2009, 06:25 PM

running a 268 cam would require him to upgrade to a 2k-2.5k stall converter. that'll be too much cam for the small stall that he has

Paint Guy · 07-03-2009, 09:20 PM

Quote: Originally Posted by PrettyRicky

running a 268 cam would require him to upgrade to a 2k-2.5k stall converter. that'll be too much cam for the small stall that he has

I have used 268 series RV cams on stock vehicles for several years and never once had to use a higher stall convertor for it to perform. I have even run 270 series with stock convertor with success (but with at least 3:55 butt gears). What is your basis for saying that a 268 needs a 2-2.5k stall convertor?

solenoid · 07-03-2009, 11:51 PM

To the best of my knowledge the comp cams 268 is 218 degrees duration at .050 lift and .454 lift which would not require a higher than stock stall speed. The 268 duration is the advertised duration of the cam.True duration is measured from .050 lift on one side of the lobe to .050 lift on the other side.

Paint Guy · 07-03-2009, 11:59 PM

I believe you are correct, Solenoid, and they are a great cam for stock drivetrain, lower compression engines, IMO.

PrettyRicky · 07-04-2009, 01:27 AM

yea my mistake i wasn't thinking advertised

Chevhead89 · 07-04-2009, 01:31 PM

u pretty much just wana stay below the 220* mark at .050. and youll be fine. i like the comp cams 270. straight pattern cam. Am runnin one in 82 dually van with a 9:1 350 and is more then enough to move the 6500+ pounds around.

C-Bo · 07-04-2009, 05:16 PM

Thanks for the info guys.. I'm pretty sure i'll end up using a comp with around 220 degrees at .050. Now i just need to find a non roller cam with the most lift..

Chevhead89 · 07-05-2009, 02:27 PM

u dont necesarilly want alot of lift. u go over the .480 mark are are gonna need to make sure your springs will hold it. and also retainer to seal clearnace. and while your at it have the shop set the proper spring pressure for ya. 110-125 would work fine for your application.

C-Bo · 07-05-2009, 03:33 PM

the spring pressure is around 110 now. the heads were on a 406 using a lunati 00012 cam

07-02-2009, 01:56 AM	#1
C-Bo RecklessPerformance Age: 22 Join Date: Jun 2009 Posts: 178 Location: The Fort, Ar User is: OffLine	Cam decision* Currently I have a sbc 350, bored .040, 4 valve relief hypereutectic pistons, stock rods, stock crank, 441 oe heads (surface milled, 2.02/1.60 valves), cam is unknown(hydrolic flat tappet), edelbrock rpm air-gap intake, holley #4777 650dp. I know the cam is way too big for this combo (around 8.3:1 compression).. I believe the cam is something like a comp 292h, just not sure. The engine was recently installed in my 92 2dr 4wd tahoe and is gutless! The tahoe has a th-350, 3.73 gear, around 1500 foot brake stall and 275/55r20 tire (tire size will be changed soon, 30-32in tall). My Question is what would be the best performing cam shaft for my application? I tried to give all info.. Please only refer cam choice if you have had experience with similar build..
	[Reply w/Quote]

07-02-2009, 03:57 AM	#2
PrettyRicky Registered User Age: 20 Join Date: Jun 2008 Posts: 29 Location: User is: OffLine	Re: Cam decision* as far as h.f.t. cams are concerned a comp xe250h(12-230-2) would serve you jus fine, w/ ur set up and full exhaust u'd see mid 300hp around 5k and low 400tq around the 2500-3000 rpm range so that'd be great w/ ur stall etc. tho if u were to up the stall and keep the gears u could run w/ a little more cam and get better performance and have more pwr to play w/. if u were to spend the extra money one a h.r.(hydro-roller) cam u could go w/ a 252xfi(12-464-8) and see high 300hp around the 5k range and mid-high 400ft lbs around teh 3.5k range all day long, keep the stall that u currently have and have a blast
	[Reply w/Quote]

07-02-2009, 09:27 AM	#3
Paint Guy Registered User Join Date: Jun 2009 Posts: 28 Location: OKC User is: OffLine	Re: Cam decision* Quote: Originally Posted by PrettyRicky as far as h.f.t. cams are concerned a comp xe250h(12-230-2) would serve you jus fine, w/ ur set up and full exhaust u'd see mid 300hp around 5k and low 400tq around the 2500-3000 rpm range so that'd be great w/ ur stall etc. tho if u were to up the stall and keep the gears u could run w/ a little more cam and get better performance and have more pwr to play w/. if u were to spend the extra money one a h.r.(hydro-roller) cam u could go w/ a 252xfi(12-464-8) and see high 300hp around the 5k range and mid-high 400ft lbs around teh 3.5k range all day long, keep the stall that u currently have and have a blast +1. agreed
	[Reply w/Quote]

07-02-2009, 01:36 PM	#4
PrettyRicky Registered User Age: 20 Join Date: Jun 2008 Posts: 29 Location: User is: OffLine	Re: Cam decision* and w/ both of those cams, h.r. preffered, and a good tune(carb or f.i.) you'd see very decent daily drivable gas mileage as well.
	[Reply w/Quote]

07-03-2009, 03:31 PM	#5
solenoid bad s-10's brewing Age: 35 Join Date: Mar 2008 Posts: 86 Location: User is: OffLine	Re: Cam decision* Over camming is easy to do ,and usually brings undesirable results espeacially on low comp motors .Ive had really good luck with the comp cams 268 on torque based low compression motors.Nice idle and good low end torque.If your running a flat tappet cam i would try that.
	[Reply w/Quote]

07-03-2009, 06:25 PM	#6
PrettyRicky Registered User Age: 20 Join Date: Jun 2008 Posts: 29 Location: User is: OffLine	Re: Cam decision* running a 268 cam would require him to upgrade to a 2k-2.5k stall converter. that'll be too much cam for the small stall that he has
	[Reply w/Quote]

07-03-2009, 09:20 PM	#7
Paint Guy Registered User Join Date: Jun 2009 Posts: 28 Location: OKC User is: OffLine	Re: Cam decision* Quote: Originally Posted by PrettyRicky running a 268 cam would require him to upgrade to a 2k-2.5k stall converter. that'll be too much cam for the small stall that he has I have used 268 series RV cams on stock vehicles for several years and never once had to use a higher stall convertor for it to perform. I have even run 270 series with stock convertor with success (but with at least 3:55 butt gears). What is your basis for saying that a 268 needs a 2-2.5k stall convertor? Last edited by Paint Guy : 07-03-2009 at 09:23 PM.
	[Reply w/Quote]

07-03-2009, 11:51 PM	#8
solenoid bad s-10's brewing Age: 35 Join Date: Mar 2008 Posts: 86 Location: User is: OffLine	Re: Cam decision* To the best of my knowledge the comp cams 268 is 218 degrees duration at .050 lift and .454 lift which would not require a higher than stock stall speed. The 268 duration is the advertised duration of the cam.True duration is measured from .050 lift on one side of the lobe to .050 lift on the other side.
	[Reply w/Quote]

07-03-2009, 11:59 PM	#9
Paint Guy Registered User Join Date: Jun 2009 Posts: 28 Location: OKC User is: OffLine	Re: Cam decision* I believe you are correct, Solenoid, and they are a great cam for stock drivetrain, lower compression engines, IMO.
	[Reply w/Quote]

07-04-2009, 01:27 AM	#10
PrettyRicky Registered User Age: 20 Join Date: Jun 2008 Posts: 29 Location: User is: OffLine	Re: Cam decision* yea my mistake i wasn't thinking advertised
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07-04-2009, 01:31 PM	#11
Chevhead89 Registered User Join Date: Aug 2008 Posts: 486 Location: Cocoa, Fl User is: OffLine	Re: Cam decision* u pretty much just wana stay below the 220* mark at .050. and youll be fine. i like the comp cams 270. straight pattern cam. Am runnin one in 82 dually van with a 9:1 350 and is more then enough to move the 6500+ pounds around.
	[Reply w/Quote]

07-04-2009, 05:16 PM	#12
C-Bo RecklessPerformance Age: 22 Join Date: Jun 2009 Posts: 178 Location: The Fort, Ar User is: OffLine	Re: Cam decision* Thanks for the info guys.. I'm pretty sure i'll end up using a comp with around 220 degrees at .050. Now i just need to find a non roller cam with the most lift..
	[Reply w/Quote]

07-05-2009, 02:27 PM	#13
Chevhead89 Registered User Join Date: Aug 2008 Posts: 486 Location: Cocoa, Fl User is: OffLine	Re: Cam decision* u dont necesarilly want alot of lift. u go over the .480 mark are are gonna need to make sure your springs will hold it. and also retainer to seal clearnace. and while your at it have the shop set the proper spring pressure for ya. 110-125 would work fine for your application.
	[Reply w/Quote]

07-05-2009, 03:33 PM	#14
C-Bo RecklessPerformance Age: 22 Join Date: Jun 2009 Posts: 178 Location: The Fort, Ar User is: OffLine	Re: Cam decision* the spring pressure is around 110 now. the heads were on a 406 using a lunati 00012 cam
	[Reply w/Quote]