What hurts this combo most?

G

gt-351

New Member

Oct 25, 2004

136

0

0

va

Sep 14, 2005

#1

• Sep 14, 2005

• #1

95 gt 351w, 9.1 comp dish pistions, GT-40 x303 heads 64cc, heads too small for trick flow 351w intake intake ports, crane h-286 cam,I want to make some changes. I have stock bottom end truck rods with good bolts.
I feel the heads are the a bigger prob than the comp ratio. Should I just leave it alone and get another tune for a 125 shot of gas? I have forged pistions. Thanks I just dont want to waste money in the wrong spots.

 

nmcgrawj

Advanced Member

Sep 28, 2003

3,651

4

68

Indianapolis, IN

Sep 14, 2005

#2

• Sep 14, 2005

• #2

gt-351 said:

95 gt 351w, 9.1 comp dish pistions, GT-40 x303 heads 64cc, heads too small for trick flow 351w intake intake ports, crane h-286 cam,I want to make some changes. I have stock bottom end truck rods with good bolts.
I feel the heads are the a bigger prob than the comp ratio. Should I just leave it alone and get another tune for a 125 shot of gas? I have forged pistions. Thanks I just dont want to waste money in the wrong spots.

Click to expand...

I would say that heads will defiantely wake that motor up...but i think 125 shot of gas would give you more power. Although it wouldnt be "power on tap" like heads are.

 

bjl95mustang

Founding Member

Jan 18, 2000

1,495

0

36

Austin,TX

Sep 14, 2005

#3

• Sep 14, 2005

• #3

get some heads with a 56cc chamber.

 

G

gt-351

New Member

Oct 25, 2004

136

0

0

va

Sep 14, 2005

#4

• Sep 14, 2005

• #4

Should I mill mi vic jr's? I bought them used but in current form they flow
200 300 400 500 600 700
int 130 188 237 264 273 267
exh 102 140 162 178 184 190
Will this be fine for a 5 spd car I mostly only to the track? I knew I can get more comp from the smaller chambers. Just wanted to add the flow # for your opinion.

 

Grn92LX

Fidanza Man!

Founding Member

Jan 14, 2001

6,819

64

129

New York

Sep 14, 2005

#5

• Sep 14, 2005

• #5

Victor jr heads are a very smart move. I would highly suggest a cam swap too. Go with a good custom cam. Are you using link bar lifters for a roller cam or are you using a flat tappet cam? The dish pistons are hurting you as well. The heads will need to be milled for optimum n/a performance. Don't forget valve springs!

The 125 shot of gas will really help out

 

bjl95mustang

Founding Member

Jan 18, 2000

1,495

0

36

Austin,TX

Sep 14, 2005

#6

• Sep 14, 2005

• #6

Are your vic jr's the 60 or 70cc heads?

 

G

gt-351

New Member

Oct 25, 2004

136

0

0

va

Sep 14, 2005

#7

• Sep 14, 2005

• #7

I still havent cc'ed them they have been shaved.How much I dont know. They were bought bare when they were new. Yeah , I need springs the heads were set up for a solid roller that had over .700 lift.

 

bjl95mustang

Founding Member

Jan 18, 2000

1,495

0

36

Austin,TX

Sep 14, 2005

#8

• Sep 14, 2005

• #8

If they are the 70 cc heads i would sell them and get something else.

I have vic jr heads and the 60 cc head with stock hardware came up 63cc and my machine shop said thats norman becuase of the valves they use. I had mine milled and cc'ed to 57.5 and that got be to about 10.5:1 with mu setup.

 

H

Hotrodsun

Member

Jun 1, 2004

58

0

7

Salem, OR

Sep 14, 2005

#9

• Sep 14, 2005

• #9

I would get the victor jr's and maybe some 1.7 RR to help the cam out a bit.

 

G

gt-351

New Member

Oct 25, 2004

136

0

0

va

Sep 28, 2005

#10

• Sep 28, 2005

• #10

Cced the heads to night and they havent been shaved they were 60 cc's. What kind of hp increase do you think I'll see? Should this hepl tq too?