size matters

suicide67 · October 9th, 2011, 04:57 PM

Im having a set of FPA headers made, What size collectors do you think I should get? 2.5 or 3" ball? I guess a better question is what size exhaust should I be running? I have a 351, all forged, CHI heads and a Vortech Ysi blower. so will 2.5" be big enough or do I need 3"?

frdnut · October 11th, 2011, 11:43 AM

Go with the 3 inch..Even if you decide to go with a smaller exhaust it gives you the option to go bigger in the future.Most performance headers come with a 3 inch collector..

69fastback · October 11th, 2011, 09:55 PM

3" all the way back. That YSI is going to feed a lot of air to your air pump, and you need to get it out.

Gregski · October 26th, 2011, 01:56 AM

depends, is it a single or a dual, if dual than 3" is too big for a small block

69fastback · October 29th, 2011, 11:38 AM

Originally Posted by Gregski

depends, is it a single or a dual, if dual than 3" is too big for a small block

No sir. My small block has dual 3". Maybe if it were stock, but he is talking about a force fed engine. With proper scavenging, 3" will always be better.

suicide67 · October 29th, 2011, 07:34 PM

yes it will be dual exhaust, but I'm hoping not to have dumps. Cant decide on rear end setup

B's04gt · October 29th, 2011, 08:02 PM

Originally Posted by 69fastback

No sir. My small block has dual 3". Maybe if it were stock, but he is talking about a force fed engine. With proper scavenging, 3" will always be better.

He knows his shit, Dont question it

October 9th, 2011, 04:57 PM	#1
suicide67 Newbie Join Date: Feb 2010 Posts: 28 iTrader: 0 reviews	size matters Im having a set of FPA headers made, What size collectors do you think I should get? 2.5 or 3" ball? I guess a better question is what size exhaust should I be running? I have a 351, all forged, CHI heads and a Vortech Ysi blower. so will 2.5" be big enough or do I need 3"?

October 11th, 2011, 09:55 PM	#3
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,572 iTrader: 0 reviews	3" all the way back. That YSI is going to feed a lot of air to your air pump, and you need to get it out. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

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October 11th, 2011, 11:43 AM	#2
frdnut Newbie 1968 sprint 11.82@120.85 Join Date: Aug 2011 Location: Canada Posts: 43 iTrader: 0 reviews	Go with the 3 inch..Even if you decide to go with a smaller exhaust it gives you the option to go bigger in the future.Most performance headers come with a 3 inch collector..

October 26th, 2011, 01:56 AM	#4
Gregski Enthusiast Join Date: Mar 2010 Posts: 718 iTrader: 0 reviews	depends, is it a single or a dual, if dual than 3" is too big for a small block

October 29th, 2011, 07:34 PM	#6
suicide67 Newbie Join Date: Feb 2010 Posts: 28 iTrader: 0 reviews	yes it will be dual exhaust, but I'm hoping not to have dumps. Cant decide on rear end setup

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