thoughts on my engine combo

thexrcist68

New Member

Apr 22, 2006

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Spotsy County, VA

Sep 24, 2006

#1

• Sep 24, 2006

• #1

heres what i have planned for my new engine for my cougar
stock rebuilt bottom end 302
aluminum gt-40 heads 1.94/1.54
lunati voodoo cam 256/ 262, Lift .483/ .499
proform hei distributor
(performer rpm intake
holley 600 cfm vac. secondary carb and headers off my old engine)


what kind of hp numbers do you think ill see from this setup,
and also do you think ill see any piston to valve clearance problems with my stock pistons and those heads/cam
also any other comments/suggestions would be great
thanks in advance

 

5

57fairlane

New Member

Apr 2, 2005

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Oakwood, GA

Sep 25, 2006

#2

• Sep 25, 2006

• #2

What gears are in the car and what converter is in it/or are planning to run?

Either way, its a pretty small cam . . . probably better suited for a generic Performer. If you don't already have #61001, I would step up to the #61002 219/227 @.050 .499"/.522". The heads will static at around .530 if they are untouched and the intake will be better suited.

3.55s and 3000 stall converter would probably round it out.

 

LMan

Founding Member

Aug 10, 2002

1,246

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Mom's basement

Sep 25, 2006

#3

• Sep 25, 2006

• #3

agree, need at least a little more cam to get more from those heads.

 

Vinyl66

Member

Mar 21, 2004

398

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16

Sep 25, 2006

#4

• Sep 25, 2006

• #4

I'd go with a larger cam like the others have stated. Those heads will breathe much better than stockers so get a cam that will help get the most out of them.
Gears and converter will make a huge difference in performance. Even if you don't plan on racing it, those 2 items will give you great seat of the pants and tire burning performance (if that's what you are after ).

 

thexrcist68

New Member

Apr 22, 2006

63

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Spotsy County, VA

Sep 25, 2006

#5

• Sep 25, 2006

• #5

alright i guess ill step up to the next size cam seeing as i havent ordered it yet , its got a 2500 rpm hughes convertor and 3.55s already so that parts taken care of,

so will my stock pistons work ok with the 1.94 intake valves in those heads

 

SoCalCruising

Founding Member

Jul 25, 2000

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SoCal

Sep 25, 2006

#6

• Sep 25, 2006

• #6

Yeah, that's the wild card. If the pistons are cut for stock valves, you could run into trouble, esp. with a bigger cam. If you haven't purchased the pistons yet, you might opt for some with more valve relief. I'd feel more confident with 1.90I valves, but maybe someone here knows more about whether 1.94s will work.

 

5

57fairlane

New Member

Apr 2, 2005

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Oakwood, GA

Sep 25, 2006

#7

• Sep 25, 2006

• #7

There are too many variables, you will have to measure.

The clay method and the weak spring method are easy and well worth the time.

 

thexrcist68

New Member

Apr 22, 2006

63

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Spotsy County, VA

Sep 25, 2006

#8

• Sep 25, 2006

• #8

57fairlane said:

There are too many variables, you will have to measure.

The clay method and the weak spring method are easy and well worth the time.

Click to expand...

can someone point me to a site that explains this in detail
and my only reason for trying to use the stock pistons is cuz theyre already in the engine and theyre in good shape so i figured id try to reuse them

 

D

D.Hearne

New Member

Sep 29, 2000

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south louisiana

Sep 26, 2006

#9

• Sep 26, 2006

• #9

Which GT40 heads? X, Y or Z ?

 

B

bnickel

Founding Member

Aug 21, 2002

5,640

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lubbock, texas

Sep 26, 2006

#10

• Sep 26, 2006

• #10

you'll probably be ok up to about .525 lift with the stock pistons and 1.94 valves but i'd still clay them just to make sure. if you do end up needing a little more valve relief in the pistons you can buy a tool (probably from comp cams) that you just use in place of an intake valve and chock up in a drill to cut a little more relief in the stock pistons. if you use a drill stop on the tool you can do all the pistons and not have to worry about having them rebalanced so long as you don't have to do a large cut.

 

thexrcist68

New Member

Apr 22, 2006

63

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Spotsy County, VA

Sep 26, 2006

#11

• Sep 26, 2006

• #11

D.Hearne said:

Which GT40 heads? X, Y or Z ?

Click to expand...

Y303 from ford racing i found a good deal on a used set

 

thexrcist68

New Member

Apr 22, 2006

63

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Spotsy County, VA

Sep 26, 2006

#12

• Sep 26, 2006

• #12

so basically this claying is puttin some clay on the top of the piston in the valve releif and installing the heads and baring the engine over then take the heads off and see where the valve contacts the clay?

 

LMan

Founding Member

Aug 10, 2002

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Mom's basement

Sep 27, 2006

#13

• Sep 27, 2006

• #13

Here you go (found this in 5 seconds with Google, btw)

http://www.fordmuscle.com/fundamentals/pistontovalve/index.shtml

 

allcarfan

The Answer Man

Founding Member

Apr 8, 2001

2,458

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56

North Atlanta

Sep 27, 2006

#14

• Sep 27, 2006

• #14

Id say you would probably make 250-275 at the wheels with that engine combo