TFS 325 heads

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TFS 325 heads

Post  Emkin on June 11th 2018, 4:59 pm

Are the TFS 325 heads too much head for a 466 with a SFT 648 lift cam 13.1 compression?

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Re: TFS 325 heads

Post  rmcomprandy on June 11th 2018, 5:00 pm

Emkin wrote:Are the TFS 325 heads too much head for a 466 with a SFT 648 lift cam  13.1 compression?

NO ...

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Re: TFS 325 heads

Post  Colt Macara on June 15th 2018, 11:46 pm

Emkin wrote:Are the TFS 325 heads too much head for a 466 with a SFT 648 lift cam  13.1 compression?

The 325's that I'm familiar with are mostly (not all, but most) are set up from TFS for high lift roller cams. Just as a precaution make sure you check the valve/spring set-up and that it compliments your SFT camshaft. The TFS 325 CNC Comp port (TFS-5341T010-C01) heads come with 250 lbs. seat pressure, or there abouts. You don't say if you are buying new or used. I'm just trying to assist your awareness. They also have .250 raised exhaust port (SCJ). Still an exceptional head. I bought that head because I also wanted the Ti retainers, but changed springs to lessen the seat pressure a tad. The spring that comes on that head also has a 1.640 OD and my Crower roller rockers were only good for a 1.625 OD. Just some things you might need to check for.

Edit: I don't know if there has been a change in specifications or my loss of memory. I just checked to be sure on the CJ exhaust port raised at .250 and Summit has a spec of .270. Could have always been, but seems like a new spec to me.
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Re: TFS 325 heads

Post  rmcomprandy on June 16th 2018, 10:36 am

Colt Macara wrote:
Emkin wrote:Are the TFS 325 heads too much head for a 466 with a SFT 648 lift cam  13.1 compression?

The 325's that I'm familiar with are mostly (not all, but most) are set up from TFS for high lift roller cams. Just as a precaution make sure you check the valve/spring set-up and that it compliments your SFT camshaft. The TFS 325 CNC Comp port (TFS-5341T010-C01) heads come with 250 lbs. seat pressure, or there abouts. You don't say if you are buying new or used. I'm just trying to assist your awareness. They also have .250 raised exhaust port (SCJ). Still an exceptional head. I bought that head because I also wanted the Ti retainers, but changed springs to lessen the seat pressure a tad. The spring that comes on that head also has a 1.640 OD and my Crower roller rockers were only good for a 1.625 OD. Just some things you might need to check for.

Edit: I don't know if there has been a change in specifications or my loss of memory. I just checked to be sure on the CJ exhaust port raised at .250 and Summit has a spec of .270. Could have always been, but seems like a new spec to me.

The question was about THAT TFS-325 head, not any components.

THAT head is available from TFS in FIVE different configurations; NOT just one.
with a roller spring package and Ti retainers  = TFS-5341T010-C01
with a flat tappet spring package = TFS-53410008-C01
with a flat tappet spring package and Ti retainers = TFS-5341T008-C01
with a hydraulic spring package = TFS-53410008-C01
and completely BARE = TFS-5341B000-C01

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Re: TFS 325 heads

Post  Colt Macara on June 16th 2018, 8:44 pm

rmcomprandy wrote:
Colt Macara wrote:
Emkin wrote:Are the TFS 325 heads too much head for a 466 with a SFT 648 lift cam  13.1 compression?

The 325's that I'm familiar with are mostly (not all, but most) are set up from TFS for high lift roller cams. Just as a precaution make sure you check the valve/spring set-up and that it compliments your SFT camshaft. The TFS 325 CNC Comp port (TFS-5341T010-C01) heads come with 250 lbs. seat pressure, or there abouts. You don't say if you are buying new or used. I'm just trying to assist your awareness. They also have .250 raised exhaust port (SCJ). Still an exceptional head. I bought that head because I also wanted the Ti retainers, but changed springs to lessen the seat pressure a tad. The spring that comes on that head also has a 1.640 OD and my Crower roller rockers were only good for a 1.625 OD. Just some things you might need to check for.

Edit: I don't know if there has been a change in specifications or my loss of memory. I just checked to be sure on the CJ exhaust port raised at .250 and Summit has a spec of .270. Could have always been, but seems like a new spec to me.



The question was about THAT TFS-325 head, not any components.

THAT head is available from TFS in FIVE different configurations; NOT just one.
with a roller spring package and Ti retainers  = TFS-5341T010-C01
with a flat tappet spring package = TFS-53410008-C01
with a flat tappet spring package and Ti retainers = TFS-5341T008-C01
with a hydraulic spring package = TFS-53410008-C01
and completely BARE = TFS-5341B000-C01

You are absolutely right Randy.
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