heads swap?
Senior User
Joined: Feb 2002
Posts: 183
Likes: 0
From: bangor maine
heads swap?
I got a 400 with 351c 4v heads on it im thinking should i do some head work on that deck the block and port and polish the heads to make more umph or should i save my cash and buy a set of aussie heads off ebay and do the head work on those. I want some higher comp ratios and obviously more horse because i race the truck in mud races but im fairly new to motors i know enough to get me into trouble but im just learnin thats theres a whole different world when it comes to squeezing as much power as what you have.
thanks for your info beacuse iv been asking a lot of questions l8ly
thanks for your info beacuse iv been asking a lot of questions l8ly
Tuned
Joined: Jun 2001
Posts: 266
Likes: 0
heads swap?
>I got a 400 with 351c 4v heads on it im thinking should i do
>some head work on that deck the block and port and polish
>the heads to make more umph or should i save my cash and buy
>a set of aussie heads off ebay and do the head work on
>those. I want some higher comp ratios and obviously more
>horse because i race the truck in mud races but im fairly
>new to motors i know enough to get me into trouble but im
>just learnin thats theres a whole different world when it
>comes to squeezing as much power as what you have.
>
>thanks for your info beacuse iv been asking a lot of
>questions l8ly
If you intend to operate above 5000 RPM, then stay with 4V heads, otherwise go with the Aussies. If your current 4V heads are open chamber, and you want to stick with 4V, find some closed chamber 4V heads...
>some head work on that deck the block and port and polish
>the heads to make more umph or should i save my cash and buy
>a set of aussie heads off ebay and do the head work on
>those. I want some higher comp ratios and obviously more
>horse because i race the truck in mud races but im fairly
>new to motors i know enough to get me into trouble but im
>just learnin thats theres a whole different world when it
>comes to squeezing as much power as what you have.
>
>thanks for your info beacuse iv been asking a lot of
>questions l8ly
If you intend to operate above 5000 RPM, then stay with 4V heads, otherwise go with the Aussies. If your current 4V heads are open chamber, and you want to stick with 4V, find some closed chamber 4V heads...
Senior User
Joined: Feb 2002
Posts: 183
Likes: 0
From: bangor maine
heads swap?
Yeah the heads i got are open chamber 4v heads. the guy that built my motor said it will turn up to 7000 rpm iv gotten a lot of "yeah right" looks and people actully saying it that they wont bealve it till they see it so yeah i guess im going to be running over 5000rpm Im just trying to squeeze the most power out of my motor. maybe i will polish and port the open chamber heads that i got? i donno we shall see thanks for the post man
nate
nate
Tuned
Joined: Jun 2001
Posts: 266
Likes: 0
heads swap?
>Yeah the heads i got are open chamber 4v heads. the guy
>that built my motor said it will turn up to 7000 rpm iv
>gotten a lot of "yeah right" looks and people actully
>saying it that they wont bealve it till they see it so yeah
>i guess im going to be running over 5000rpm Im just trying
>to squeeze the most power out of my motor. maybe i will
>polish and port the open chamber heads that i got? i donno
>we shall see thanks for the post man
>
>nate
If you polish the open chambers you may be able to run 9.5:1 pistons on pump gas. With polised quench heads you could run pistons up to 11:1 on pump gas. So - if you are going to stick with the 4V heads for high RPM's and you want 'high' compression, your only option is 4V quench heads.
>that built my motor said it will turn up to 7000 rpm iv
>gotten a lot of "yeah right" looks and people actully
>saying it that they wont bealve it till they see it so yeah
>i guess im going to be running over 5000rpm Im just trying
>to squeeze the most power out of my motor. maybe i will
>polish and port the open chamber heads that i got? i donno
>we shall see thanks for the post man
>
>nate
If you polish the open chambers you may be able to run 9.5:1 pistons on pump gas. With polised quench heads you could run pistons up to 11:1 on pump gas. So - if you are going to stick with the 4V heads for high RPM's and you want 'high' compression, your only option is 4V quench heads.
