gt40p heads and crower 15511 camshaft

andys89gt · November 29th, 2010, 12:34 PM

hey guys i need some crucial information. i have an 88 gt with speed density (do not plan on going maf anytime soon). im putting it all together with this combo:

crower 15511 camshaft
gt40p heads (planning on doing mild port)
gt40 upper intake (match-port with heads)
and bottle prob 150-175 shot

my question: will i have to change anything from the stock gt40p heads when i put in the crower cam? will i need to change valves, springs, rods anything? and also will stock gt40p roller rockers work?

any info is greatly appreciated! keep in mind im a 20 year old full time student and cash is not abundant right now just looking for the biggest bang for my hard worked buck.

93hatch · November 29th, 2010, 12:53 PM

the stock springs in the heads are junk and the rockers in the heads arent roller rockers, theyre the same as the mustang ones. So yes you can use them

Edit: meant to say arent roller rockers

andys89gt · November 29th, 2010, 12:59 PM

what springs would you suggest?

flattusmaximus78 · November 29th, 2010, 01:03 PM

I hope you don't plan to daily drive that car. Anything aside from the stock cam will ruin the idle quality as well as the drivability of any speed density car.

93hatch · November 29th, 2010, 01:24 PM

I thiiiiink that cams fine with sd

andys89gt · November 29th, 2010, 02:06 PM

Originally Posted by flattusmaximus78

I hope you don't plan to daily drive that car. Anything aside from the stock cam will ruin the idle quality as well as the drivability of any speed density car.

It is a custom grind cam from crower made specifically for speed density.

andys89gt · November 29th, 2010, 02:08 PM

Any take on what springs to use?? IF the stockers from the gt40p's are no good? I called crower and I was told that the cam is compatible with the gt40p's and should work fine.

93hatch · November 29th, 2010, 02:23 PM

ask flattus how he liked his valve float with his stock P springs

95StangMX · November 29th, 2010, 03:56 PM

Just a question, but why spend the dinero on a custom cam for SD instead of changing to MAF?

flattusmaximus78 · November 29th, 2010, 05:40 PM

Originally Posted by 93hatch

ask flattus how he liked his valve float with his stock P springs

I'd rather dock with you than do that again. If your not going to swap valve springs or get the correct springs just leave the e7's on. It'll make the same power.

holset35 · November 29th, 2010, 08:04 PM

Look man Ford Racing has springs for less than a $100 and it is piece of mind that you wont have float.

69fastback · November 29th, 2010, 09:14 PM

Must.....change.......springs

And you will need new pushrods too.

95StangMX · November 30th, 2010, 02:08 PM

CHANGE the springs!

69fastback · November 30th, 2010, 04:06 PM

Just in case you're unsure....

CHANGE THE SPRINGS

andys89gt · December 2nd, 2010, 12:55 PM

[B]UPDATE:[B] changing the springs and doing a valve job now to gt40p. no more port job nor roller rockers . just gonna wait till tax return season to buy some dart heads with full race port and complete valvetrain. what you guys think?

93hatch · December 2nd, 2010, 01:04 PM

lol at dart heads

95StangMX · December 2nd, 2010, 04:35 PM

Hell no, why dart heads? Don't tell me you are one of these "aluminum heads warp" guys are you?

November 29th, 2010, 12:34 PM	#1
andys89gt Newbie Join Date: Nov 2010 Posts: 15 iTrader: 0 reviews	gt40p heads and crower 15511 camshaft hey guys i need some crucial information. i have an 88 gt with speed density (do not plan on going maf anytime soon). im putting it all together with this combo: crower 15511 camshaft gt40p heads (planning on doing mild port) gt40 upper intake (match-port with heads) and bottle prob 150-175 shot my question: will i have to change anything from the stock gt40p heads when i put in the crower cam? will i need to change valves, springs, rods anything? and also will stock gt40p roller rockers work? any info is greatly appreciated! keep in mind im a 20 year old full time student and cash is not abundant right now just looking for the biggest bang for my hard worked buck.

November 29th, 2010, 12:53 PM	#2
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	the stock springs in the heads are junk and the rockers in the heads arent roller rockers, theyre the same as the mustang ones. So yes you can use them Edit: meant to say arent roller rockers __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE] Last edited by 93hatch; November 29th, 2010 at 01:06 PM.

November 29th, 2010, 01:03 PM	#4
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	I hope you don't plan to daily drive that car. Anything aside from the stock cam will ruin the idle quality as well as the drivability of any speed density car. __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

November 29th, 2010, 01:24 PM	#5
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	I thiiiiink that cams fine with sd __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

November 29th, 2010, 02:23 PM	#8
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	ask flattus how he liked his valve float with his stock P springs __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

November 29th, 2010, 12:59 PM	#3
andys89gt Newbie Join Date: Nov 2010 Posts: 15 iTrader: 0 reviews	what springs would you suggest?

November 29th, 2010, 02:08 PM	#7
andys89gt Newbie Join Date: Nov 2010 Posts: 15 iTrader: 0 reviews	Any take on what springs to use?? IF the stockers from the gt40p's are no good? I called crower and I was told that the cam is compatible with the gt40p's and should work fine.

November 29th, 2010, 03:56 PM	#9
95StangMX MM Fanatic 95 Mustang GT depends how many people are pushing Join Date: Oct 2007 Location: Playa del Carmen, Mexico Posts: 3,243 iTrader: 0 reviews	Just a question, but why spend the dinero on a custom cam for SD instead of changing to MAF? __________________ People should think about boarding up their glass house before starting a rock fight!

November 29th, 2010, 08:04 PM	#11
holset35 Regular 1986 LX NOTCH Join Date: May 2010 Location: MICHIGAN Posts: 140 iTrader: 0 reviews	Look man Ford Racing has springs for less than a $100 and it is piece of mind that you wont have float. __________________ 86 TRUNK 359w-SRP 8:1-GT40Ps-X303-MAC LONGTUBE'S-VICTOR JR INTAKE-850 HOLLEY-T-5-410's-150 shot

November 29th, 2010, 09:14 PM	#12
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	Must.....change.......springs And you will need new pushrods too. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

November 30th, 2010, 02:08 PM	#13
95StangMX MM Fanatic 95 Mustang GT depends how many people are pushing Join Date: Oct 2007 Location: Playa del Carmen, Mexico Posts: 3,243 iTrader: 0 reviews	CHANGE the springs! __________________ People should think about boarding up their glass house before starting a rock fight!

November 30th, 2010, 04:06 PM	#14
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	Just in case you're unsure.... CHANGE THE SPRINGS __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

December 2nd, 2010, 12:55 PM	#15
andys89gt Newbie Join Date: Nov 2010 Posts: 15 iTrader: 0 reviews	[B]UPDATE:[B] changing the springs and doing a valve job now to gt40p. no more port job nor roller rockers . just gonna wait till tax return season to buy some dart heads with full race port and complete valvetrain. what you guys think?

December 2nd, 2010, 01:04 PM	#16
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	lol at dart heads __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

December 2nd, 2010, 04:35 PM	#17
95StangMX MM Fanatic 95 Mustang GT depends how many people are pushing Join Date: Oct 2007 Location: Playa del Carmen, Mexico Posts: 3,243 iTrader: 0 reviews	Hell no, why dart heads? Don't tell me you are one of these "aluminum heads warp" guys are you? __________________ People should think about boarding up their glass house before starting a rock fight!

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