throttle body boring benefit when doing headwork
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Elite HDF Member
Joined: Aug 2013
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From: Hawkeye state
throttle body boring benefit when doing headwork
This winter I plan to pull my heads and get some port/polish done, 1.9 intake valve, etc. While its off will boring the throttle body a few mm be any benefit? Just a 103 with Andrews 57 cams, 2-1 pro pipe, air cleaner and tune it with tts. Going 107 is out of budget and figure headwork best route to add with cams.
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Elite HDF Member
Joined: Aug 2013
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From: Hawkeye state
I planned on taking them to axtell to get done unless hillside or someone can justify me shipping them vs dropping them off somewhere. I assume that would be part of them boring it is reassembly. I could tear it down but rather let machinist do it. I know a local Indy who could do the heads but know they need done particular to my camshaft
Seasoned HDF Member
Joined: Dec 2009
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From: Doghouse... mostly
Not enough of a HP gain unless you're going to go BIG STROKER motor and I mean BIG. You may be able to pick up a total of 1-3 HP and maybe 5 TQ overall. A 50 mm TB will handle anything you can throw at it on a 103. Not very cost effective for what it's going to run you.
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Joined: Sep 2009
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From: deland,florida
it really depends on what work your doing with the heads.even on a 103",if its going to be a fairly aggressive build,its a very good idea to do the t. body also.one thing overlooked is the runners & port opening.just boring the t. body leaves a lot on the table.stock HD t. bodies can have the runners opened to 1.700.
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Elite HDF Member
Joined: Aug 2013
Posts: 3,789
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From: Hawkeye state
it really depends on what work your doing with the heads.even on a 103",if its going to be a fairly aggressive build,its a very good idea to do the t. body also.one thing overlooked is the runners & port opening.just boring the t. body leaves a lot on the table.stock HD t. bodies can have the runners opened to 1.700.
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Road Captain
Joined: Aug 2014
Posts: 624
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From: Central Arkansas
I don't know that I would do a throttle body right off the bat. I would do my heads and my dyno then decide. When Mike did my tune he didn't mention any need for more flow. The 57's work best with a mild head so I don't know that you would use the extra flow.