Rectangle port T/R to oval port heads
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Rectangle port T/R to oval port heads

  1. #1
    Bass Lake Dream'n "Flat" foot'n's Avatar
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    Default Rectangle port T/R to oval port heads

    I have a tunnel ram and carbs I want to use boat am short of cash for new heads right now. The heads are iron 049's on a 468bbc, 9:1 comp w/ a solid lift cam (i'll dig up the specs later if needed).
    What if any problems can arise if I make this swap? I have read on other hot rod forums that this is not a problem, guys even said they saw better et's. That's cars, what about a v-drive?
    Thanks.

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    Senior Member creepingcharlie's Avatar
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    Im running rect port t ram on oval port heads and see no problems. It turns 5k with a single 650 in my v-drive with 15% gears. If you want you can port match the heads to the t ram ports and get better flow.

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    Senior Member Bubbletop409's Avatar
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    I would think you would be better off if the heads were rec. and the manifold oval, I can see that working much better. Picture this, you are driving at 65 mph on a four lane highway, which suddenly with out warning necks down to three lanes. The flow and direction will be severly inhibited at the transition point. Oval port TR's are available cheaply on e bay or racingjunk.com all the time, I would be looking for the proper fitment.
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    Its doable for short term . I have read about "puddling" problems" ( fuel )
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    just make sure u use the rite gaskets!

    FWIW...u can NOT use a oval port manif on rect port heads!!! ...it will not work, period

    FastRat

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    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by FastRat View Post
    just make sure u use the rite gaskets!

    FWIW...u can NOT use a oval port manif on rect port heads!!! ...it will not work, period

    FastRat
    It depends on the intake as long as it has enough flange to use the rectangle port gaskets it will bolt up and seal. No promises on performance but after owning both I know the Weiand Team G oval port will bolt up and seal to a set of rectangle port heads.

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    Senior Member Bruise Brothers Dad's Avatar
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    Quote Originally Posted by Bubbletop409 View Post
    I would think you would be better off if the heads were rec. and the manifold oval, I can see that working much better. Picture this, you are driving at 65 mph on a four lane highway, which suddenly with out warning necks down to three lanes. The flow and direction will be severly inhibited at the transition point. Oval port TR's are available cheaply on e bay or racingjunk.com all the time, I would be looking for the proper fitment.
    You are killing your flow. Small oval port 049 heads when massaged with a manifold that matches will surprise many people with the flow numbers. Might not make major cfm #'s but the velocity #'s will help put more charge in the chamber. A larger intake helps too. My son has gone as large as a 2.300 intake in the 049 head. But no mater what you do it all comes down to your total combination and what rpm range you expect to run. Bottom end to mid range dual plain manifolds for up to 6000 rpm. 6000 and up single plain manifolds . Tunnel rams look cool but are for rpm application up to the moon and beyond . The secret to making anything work good is the proper combination. But a tunnel ram with oval port runners on a 049 head will surprise the hell out of you
    Last edited by Bruise Brothers Dad; 11-25-2009 at 01:41 PM.
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    Bass Lake Dream'n "Flat" foot'n's Avatar
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    right now I'm running a single plane Dart with a 800cfm holley. turns 6500rpm w/ 15% gears. An honest 80-85mph on gps. I have 2 750's that will sit on top the t/r.
    What work should/could i do to the valves on these old 049's?

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    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by BASS LAKE BARRON SPRINT View Post
    right now I'm running a single plane Dart with a 800cfm holley. turns 6500rpm w/ 15% gears. An honest 80-85mph on gps. I have 2 750's that will sit on top the t/r.
    What work should/could i do to the valves on these old 049's?

    If mph is what your after you maybe be disappointed, not sure if my results are typical but when I switched from a Weiand Team G with a flowed 850 (990cfm) to an Edelbrock Victor 2R with dual 750s I only gained 1-2mph but th boat was quicker. Personally I expected more mph and not much on ET.

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    Quote Originally Posted by BASS LAKE BARRON SPRINT View Post
    right now I'm running a single plane Dart with a 800cfm holley. turns 6500rpm w/ 15% gears. An honest 80-85mph on gps. I have 2 750's that will sit on top the t/r.
    What work should/could i do to the valves on these old 049's?
    Have the factory large size valves installed, and some mild porting work, bowl cleanup, redius blending (espcially the short side), a bit of relieving on the chamber side close to the side of the new bigger intakes.

    The above work, plus reduced valve stem size to 11/32 (then the undercut Manley Pro Flow valves also) made a huge difernce on my fairly modestly modded 454, single carb on a Perf. RPM Air Gap.
    The head work alone picked me up 400RPM against an Aggressor B in a tight pump, and even better throttle response than it had before..
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    Bass Lake Dream'n "Flat" foot'n's Avatar
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    Quote Originally Posted by Carnivalride View Post
    If mph is what your after you maybe be disappointed, not sure if my results are typical but when I switched from a Weiand Team G with a flowed 850 (990cfm) to an Edelbrock Victor 2R with dual 750s I only gained 1-2mph but th boat was quicker. Personally I expected more mph and not much on ET.
    I'm more interested in the "quickness", not too concerned with top end.

    Also like the look

  14. #12
    steelcomp was here
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    The mismatch issues for the most part are a misnomer. Air will pack against the face if the head where the mismatch is and creat a boundry layer, while the sharp edges of the port will "shear" the air that's entering the port. The transition is actually relatively smooth. It's not an ideal scenario, but just blending the opening of the port to match the intake will gain very little, if anything and if done poorly will cause more turbulence than if left alone.
    The 049's are a great cantidate for larger valves, a good quality valve job and a bowl blend. On anything under 500" you can make excellent power up to about 6500rpm.
    Last edited by scott foxwell; 11-25-2009 at 06:17 PM.
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    gn7
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    No matter what, make no attempt to do this. This is just a waste of time and does absolutely nothing. Could possibly even hurt the flow. Steelcomp, do you remember seeing these in a post a while back on this same subject.



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  16. #14
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    Quote Originally Posted by gn7 View Post
    No matter what, make no attempt to do this. This is just a waste of time and does absolutely nothing. Could possibly even hurt the flow. Steelcomp, do you remember seeing these in a post a while back on this same subject.
    Yes, this is precisely what I'm talking about.
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