[DeTomaso] Port matching heads to headers?

[Daniel C Jones]

> What sort of heads to headers port matching should be done?

No need to gasket match.  It's best to use high temperature RTV around the
ports, without a gasket.  Be aware that the ANSA mufflers will cost you 50
HP and upset the idle.  What cam are you going to run?

> The intake did receive extensive work though

That was based upon our flow bench testing of the Blue Thunder dual plane
intake which showed 4 good runners and 4 bad runners.  Out-of-the-box, the
Blue Thunder made 31 HP less than a Ford dual plane (Holley carb pattern of
the Boss 351 aluminum intake) that had it's runners equalized and 46 HP
less than an unported Holley Strip Dominator single plane.  With the
runners equalized, the Blue Thunder and Strip Dominator were very close
with the Blue Thunder making a bit more power.

Dan Jones

On Thu, Mar 22, 2018 at 3:08 PM, Larry Finch via DeTomaso <
detomaso at server.detomasolist.com> wrote:

> All,
>
> Slowly, much like the repairs to 2511, my engine is being assembled, and
> my engine builder posed a question I do not know how to answer.
>
> I am using the 4-barrel CHI heads and blue thunder intake, 404 stroker,
> GTS tri-y headers.
>
> Exhaust ports on my heads are not CNC machined but remain as cast.
>
> Question:
>
> What sort of heads to headers port matching should be done?
>
> None? Match to gasket? Or???
>
> Any wisdom you can provide is appreciated.
>
> Thanks,
>
> Larry
>
> Sent from me using a magic, handheld electronic gizmo.
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-------------- next part --------------
   > What sort of heads to headers port matching should be done?
   No need to gasket match.A  It's best to use high temperature RTV around
   the ports, without a gasket.A  Be aware that the ANSA mufflers will
   cost you 50 HP and upset the idle.A  What cam are you going to run?
   > The intake did receive extensive work though
   That was based upon our flow bench testing of the Blue Thunder dual
   plane intake which showed 4 good runners and 4 bad runners.A
   Out-of-the-box, the Blue Thunder made 31 HP less than a Ford dual plane
   (Holley carb pattern of the Boss 351 aluminum intake) that had it's
   runners equalized and 46 HP less than an unported Holley Strip
   Dominator single plane.A  With the runners equalized, the Blue Thunder
   and Strip Dominator were very close with the Blue Thunder making a bit
   more power.
   Dan Jones

   On Thu, Mar 22, 2018 at 3:08 PM, Larry Finch via DeTomaso
   <[1]detomaso at server.detomasolist.com> wrote:

     All,
     Slowly, much like the repairs to 2511, my engine is being assembled,
     and my engine builder posed a question I do not know how to answer.
     I am using the 4-barrel CHI heads and blue thunder intake, 404
     stroker, GTS tri-y headers.
     Exhaust ports on my heads are not CNC machined but remain as cast.
     Question:
     What sort of heads to headers port matching should be done?
     None? Match to gasket? Or???
     Any wisdom you can provide is appreciated.
     Thanks,
     Larry
     Sent from me using a magic, handheld electronic gizmo.
     _______________________________________________
     Detomaso Email List is not managed by POCA
     Posted emails must not exceed 1.5 Megabytes
     DeTomaso mailing list
     [2]DeTomaso at server.detomasolist.com
     [3]http://server.detomasolist.com/mailman/listinfo/detomaso
     To manage your subscription (change email address, unsubscribe,
     etc.) use the links above.
     Members who post to this list grant license to the list to forward
     any message posted here to all past, current, or future members of
     the list. They also grant the list owner permission to maintain an
     archive or approve the archiving of list messages.

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