Factory heads and intake

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Factory heads and intake

Post  hpwdboss1 on September 17th 2014, 9:22 pm

I  pull in a tractor class that requires we use factory iron heads, block and intake manifold. We must use a 650 Holley and a MSD box with a 6k chip. A wide torque curve is best. Is there any benefit to cylinder head modifications (i.e. porting etc.)? Perry
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Re: Factory heads and intake

Post  maverick on September 17th 2014, 9:52 pm

Cubic inch limit?
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Re: Factory heads and intake

Post  FalconEh on September 17th 2014, 10:28 pm

Stroke allowed?
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Factory Iron

Post  hpwdboss1 on September 17th 2014, 11:17 pm

We run 500 c.i. or less, running 3.85 stroke and flat tappet. Pretty open other than that. We are at 14.8 to 1 comp ratio. Racing gas, no alcohol. Tuning mods only on carb. Perry
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Re: Factory heads and intake

Post  samiam on September 18th 2014, 1:12 am

hpwdboss1 wrote:I  pull in a tractor class that requires we use factory iron heads, block and intake manifold. We must use a 650 Holley and a MSD box with a 6k chip. A wide torque curve is best. Is there any benefit to cylinder head modifications (i.e. porting etc.)? Perry

My class is limited to 472,,, Iam running Iron heads,,, the last mods to them were strictly on the ex. side, if you want more in you have to get more out
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Re: Factory heads and intake

Post  IDT-572 on September 18th 2014, 10:16 am

samiam wrote:
hpwdboss1 wrote:I  pull in a tractor class that requires we use factory iron heads, block and intake manifold. We must use a 650 Holley and a MSD box with a 6k chip. A wide torque curve is best. Is there any benefit to cylinder head modifications (i.e. porting etc.)? Perry

My class is limited to 472,,, Iam  running Iron heads,,, the last mods  to them were strictly on the ex. side,  if you want more in you have to get more out

Port both you need to get all you can in with good air speed and use the cam to get it out.
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Re: Factory heads and intake

Post  Paul Kane on September 19th 2014, 11:36 am

hpwdboss1 wrote:I  pull in a tractor class that requires we use factory iron heads, block and intake manifold. We must use a 650 Holley and a MSD box with a 6k chip. A wide torque curve is best. Is there any benefit to cylinder head modifications (i.e. porting etc.)? We run 500 c.i. or less... We are at 14.8 to 1 comp ratio. Racing gas, no alcohol. Tuning mods only on carb. Perry
Max effort port the factory iron heads, iron CJ intake, and offset stroke an OEM crankshaft to 4.125", 6.7" rod, 4.39" bore 1.54"-ish c/h piston, and you'll have a really good 499 CI platform to start with.

Or you could stroke to 4.05", 6.7 rod, and a KB IC855 for a 490 (+0.030") to 497 (+0.060").....
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Re; Factory heads and intake

Post  hpwdboss1 on September 25th 2014, 11:25 pm

Thanks for helping again, guys. Have spoken to Mr. C.  Evans and going to work on a fresh pair of heads.
Perry
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