Stage 3 heads/blower cams?

jivepepper · April 29th, 2008, 09:11 AM

I hope to purchase MMR stage 3 heads in the next week or two, and was considering upgrading my cams too.

So far the two I have considered, are Cushman stage 3 blower cams, or a stage 3 custom grinds from comp and MMR.

I have been running Houston Performance S292 cams on the stock heads and have been very happy with them. I picked up about 80 hp with them and just a retune.

The specs for the HP s292 are:
.531/.531 lift, 242/242 .050 duration, 114 LSA.

The Cushman stage 3 blower cams are:
.545/.545 lift, 238/242 .050 duration, 115 LSA.

Besides .014 of lift and 1 degree of lobe separation both cams are very similar, and I was wondering if they would really help much. I actually paid more the for the HP's compared to the price of the Cushman's

The Cushman grinds are the same as the VT stage 3 cams for those who might not know that Jim started his own company after VT engines.

So my options are (Unless some thinks of something better) are:

Keep the HP s292 cams

MMR/Comp custom grind. But MMR is better known for turbo set ups

Cushman stage 3 blower cams.

I appreciate and suggestions and info. Thanks!

lilmarc1988 · April 29th, 2008, 09:59 AM

+1 i would like to know as well

acmillr · April 29th, 2008, 10:07 AM

I would suggest keeping the cams you have. I think you will see some serious gains with a good pair of ported heads underneath your current grind. Taking the intake duration down is not going to make a huge difference (it could actually hurt you). Do you have the ramp rates for either of the cams? The ramp rates and duration can affect power dramatically more than the total lift. That is the great thing about Comp cams. They will make great power with less lift than other cams due to an aggressive ramp rate. Also, keep in mind that lower lift will increase valve spring life.
As far as the duration and lobe seperation go, I think you are already close to the point of having some overlap issues that could destroy some of your power, so I wouldn't stretch the duration out.

limited · April 29th, 2008, 02:14 PM

I would have to agree to just keep the ones you have,don't see gaining much(if any) for the cost. ported heads is were your going to find the power improvement

jivepepper · April 29th, 2008, 03:25 PM

Thanks guys, I would like to keep what I have. It would save me a crap load of money. I will have to see if I can get the info on ramp rates.

April 29th, 2008, 09:11 AM	#1
jivepepper MM Fanatic Join Date: Mar 2006 Location: Under a sombrero Posts: 4,558 iTrader: 1 reviews	Stage 3 heads/blower cams? I hope to purchase MMR stage 3 heads in the next week or two, and was considering upgrading my cams too. So far the two I have considered, are Cushman stage 3 blower cams, or a stage 3 custom grinds from comp and MMR. I have been running Houston Performance S292 cams on the stock heads and have been very happy with them. I picked up about 80 hp with them and just a retune. The specs for the HP s292 are: .531/.531 lift, 242/242 .050 duration, 114 LSA. The Cushman stage 3 blower cams are: .545/.545 lift, 238/242 .050 duration, 115 LSA. Besides .014 of lift and 1 degree of lobe separation both cams are very similar, and I was wondering if they would really help much. I actually paid more the for the HP's compared to the price of the Cushman's The Cushman grinds are the same as the VT stage 3 cams for those who might not know that Jim started his own company after VT engines. So my options are (Unless some thinks of something better) are: Keep the HP s292 cams MMR/Comp custom grind. But MMR is better known for turbo set ups Cushman stage 3 blower cams. I appreciate and suggestions and info. Thanks! __________________ 2000 GT 665/540rwhp/rwtq On pump gas Best 1/4 638hp street tune 11.01, best trap 134MPH, 80*+day, 10.5" DD Cobra R's & 315/35/17 DR'S DYNO VID ---> http://www.youtube.com/watch?v=K9uOS732mdA

April 29th, 2008, 09:59 AM	#2
lilmarc1988 Hardcore Enthusiast 2001 mustang gt Join Date: Sep 2007 Location: lehigh acres, fl Posts: 1,454 iTrader: 0 reviews	+1 i would like to know as well __________________ http://www.cardomain.com/ride/3112249

April 29th, 2008, 10:07 AM	#3
acmillr MM's Mad Scientist Slow Fella Join Date: Jul 2006 Location: Tupelo, MS Posts: 5,120 iTrader: 2 reviews	I would suggest keeping the cams you have. I think you will see some serious gains with a good pair of ported heads underneath your current grind. Taking the intake duration down is not going to make a huge difference (it could actually hurt you). Do you have the ramp rates for either of the cams? The ramp rates and duration can affect power dramatically more than the total lift. That is the great thing about Comp cams. They will make great power with less lift than other cams due to an aggressive ramp rate. Also, keep in mind that lower lift will increase valve spring life. As far as the duration and lobe seperation go, I think you are already close to the point of having some overlap issues that could destroy some of your power, so I wouldn't stretch the duration out. __________________

April 29th, 2008, 02:14 PM	#4
limited Premium Member 99 limited edition vert Join Date: Mar 2007 Location: Tacoma,Washington Posts: 3,067 iTrader: 0 reviews	I would have to agree to just keep the ones you have,don't see gaining much(if any) for the cost. ported heads is were your going to find the power improvement __________________ KB'd 446rwhp/451rwtq, Mustang Dyno http://www.youtube.com/watch?v=3ZDpQ0EEm1M Tuned by Joe at http://www.tricktuners.com

April 29th, 2008, 03:25 PM	#5
jivepepper MM Fanatic Join Date: Mar 2006 Location: Under a sombrero Posts: 4,558 iTrader: 1 reviews	Thanks guys, I would like to keep what I have. It would save me a crap load of money. I will have to see if I can get the info on ramp rates. __________________ 2000 GT 665/540rwhp/rwtq On pump gas Best 1/4 638hp street tune 11.01, best trap 134MPH, 80*+day, 10.5" DD Cobra R's & 315/35/17 DR'S DYNO VID ---> http://www.youtube.com/watch?v=K9uOS732mdA

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