X303, 1.6 roller rockers, and protopline 180 58cc heads?

IndyBlk5.0

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Jun 17, 2004

#1

• Jun 17, 2004

• #1

If in fact my valvetrain is shot, I am thinking about going with the protopline 180 58cc heads.
(shown here are the 64cc flow numbers, and have been verified by an outside source) http://www.procylinderheads.com/f2204000180.htm
X303 camshaft with stock ratio roller rockers would be somewhere around this.
Advertised duration: 299 intake/309 exhaust
Duration at .050 in. cam lift: 222 intake/232 exhaust
Gross valve lift: .510 in. intake/.534 exhaust
Lobe separation: 112 degrees
Peak horsepower rpm: 6,000
Peak torque rpm: 2,750
Power range 2500-6000 - Fair to slightly rough idle
P/V clearance will be fully addressed by a machine shop. Stock pushrods and lifters will be okay?????
With my gt40 lower ported by Tom (tmoss), and a 70mm tbody, I hope to exceed 300rwhp, maybe 330 range.... possible?

 

IndyBlk5.0

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#2

• Jun 18, 2004

• #2

no comments huh?

 

N8Miller

I need NOS....make it 2 of the big ones

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Jun 18, 2004

#3

• Jun 18, 2004

• #3

you say that you want the 58cc heads, but list the flows for the 64.... which one are you getting? go with the 64 to lessen the compression ratio.

 

IndyBlk5.0

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#4

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why would i want to lower compression when a blower or any power adder is not in the plan for this motor? It has hyper pistons

 

N8Miller

I need NOS....make it 2 of the big ones

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#5

• Jun 18, 2004

• #5

IndyBlk5.0 said:

why would i want to lower compression when a blower or any power adder is not in the plan for this motor? It has hyper pistons

Click to expand...

my bad. i thought that for some reason you said something about a blower.

 

IndyBlk5.0

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#6

• Jun 18, 2004

• #6

scratch that cam, it is the wrong specs. need cam advise. Something that will fit =)

 

WantaGT

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Jun 18, 2004

#7

• Jun 18, 2004

• #7

hey, indy. i hope that someone will answer your questions because i have no idea. i think you should be 300+. as soon as you know you need to let me know first! i love the idea of an affordable head that can, from initial reviews, have great power potential.

 

IndyBlk5.0

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• Jun 18, 2004

• #8

thanks wantagt...

Will my B303 with 1.7 roller rockers only hurt my performace? Or will it work well?

 

WantaGT

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#9

• Jun 18, 2004

• #9

if it was me i would run a bigger cam with 1.6, maybe a custom cam but i think the x would do fine. but i'm not an engine guru by any stretch so maybe someone will confirm for me

 

IndyBlk5.0

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#10

• Jun 18, 2004

• #10

pretty sure there is no way the X cam would clear. (p/v clearance wise)
michael yount? thumper? tmoss?

 

WantaGT

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#11

• Jun 18, 2004

• #11

you maybe need to cut your pistons

 

SLiM JiM 156

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#12

• Jun 18, 2004

• #12

WantaGT said:

if it was me i would run a bigger cam with 1.6, maybe a custom cam but i think the x would do fine. but i'm not an engine guru by any stretch so maybe someone will confirm for me

Click to expand...

A bigger cam with 1.6? That cam is already pretty damn big I doubt he needs anything bigger. If I were you and I was already tearing everything down to do it right, I would call someone up and get a custom ground cam to maximize your performance.

 

WantaGT

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#13

• Jun 18, 2004

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SLiM JiM 156 said:

A bigger cam with 1.6? That cam is already pretty damn big I doubt he needs anything bigger. If I were you and I was already tearing everything down to do it right, I would call someone up and get a custom ground cam to maximize your performance.

Click to expand...

it's definately not huge though

 

SLiM JiM 156

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#14

• Jun 18, 2004

• #14

WantaGT said:

it's definately not huge though

Click to expand...

True, I got away with running the x-303 with GT-40x aluminum heads with stock rockers/pushrods..

My opinion though would be to get a custom ground cam

 

WantaGT

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#15

• Jun 18, 2004

• #15

same here i'm just sayin i would rather have the x than teh b

 

Mike86Stang

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Jun 18, 2004

#16

• Jun 18, 2004

• #16

Valve events determine P/V/C not peak lift... IM me later I have a suggestion for you.