"A" vs "C" cylinder head

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Re: "A" vs "C" cylinder head

Post  Curt on March 29th 2015, 6:39 pm

Lem Evans wrote:
Curt wrote:At one time, there was a huge difference in the performance abilities between the A & C heads. With all the advancements of the A head, that margin has closed up quite a bit.

You are assuming that advancements have not been made to the C heads too. I don't know that I'd call the difference HUGE for current A & C heads but, the difference is very measureable.  

There are A heads out there reporting as much power as my well worked C heads are making. Where did I go wrong??
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Re: "A" vs "C" cylinder head

Post  schmitty on March 29th 2015, 7:11 pm

Curt wrote:
Lem Evans wrote:
Curt wrote:At one time, there was a huge difference in the performance abilities between the A & C heads. With all the advancements of the A head, that margin has closed up quite a bit.

You are assuming that advancements have not been made to the C heads too. I don't know that I'd call the difference HUGE for current A & C heads but, the difference is very measureable.  

There are A heads out there reporting as much power as my well worked C heads are making. Where did I go wrong??
Time to step it up then Laughing There are A's out there making over 1200hp now, that was strictly C and better territory not that long ago. I will bet that there will be a set of C's going over 1300hp on a single carb before long. Twisted Evil
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Re: "A" vs "C" cylinder head

Post  Lem Evans on March 29th 2015, 7:34 pm

Curt, I'd be the last guy to say that you did anything "wrong" but, please notice what I said in my 1st post "as things evolve". Both style cylinder head packages have evolved.

Some of the chief suspects in this evolution are; valve shape, valve job, the ports, 1450 or bigger carbs, ring package, piston coatings, camshaft, etc. It's like the rest of the world....not much is standing still.

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Re: "A" vs "C" cylinder head

Post  466cj on March 29th 2015, 9:33 pm

I'd say the A head is where the take it out of the box and bolt it on head options end. C heads and the other exotics all are intended to be a place to start for the professional head guys. I'd doubt you are going to order a set of A heads from TFS, bolt them on and make 1,200+ hp NA. At some point cost to get those big numbers can make moving to a C head or better a better choice. All depends on what you want to achieve.

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Re: "A" vs "C" cylinder head

Post  DanH on March 30th 2015, 6:21 am

garys gt wrote:How much does a C head cost ready to run with similar valvetrain as the A head would come with ?

differeance in cost including intake was $68 . That starting with bare A or C. heads.

that was several years ago price. The C head can hit 490+ cfm with most port work done in the bowl area and the right valve job.

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Re: "A" vs "C" cylinder head

Post  bruno on March 30th 2015, 9:11 pm

DanH wrote:
garys gt wrote:How much does a C head cost ready to run with similar valvetrain as the A head would come with ?

differeance in cost including intake was $68 . That starting with bare A or C. heads.

that was several years ago price.  The C head can hit 490+ cfm with most port work done in the bowl area and the right valve job.

your telling me the only difference between the 2 heads is $68 starting from a clean build scratch
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Re: "A" vs "C" cylinder head

Post  schmitty on March 30th 2015, 9:52 pm

bruno wrote:
DanH wrote:
garys gt wrote:How much does a C head cost ready to run with similar valvetrain as the A head would come with ?

differeance in cost including intake was $68 . That starting with bare A or C. heads.

that was several years ago price.  The C head can hit 490+ cfm with most port work done in the bowl area and the right valve job.

your telling me the only difference between the 2 heads is $68 starting from a clean build scratch
I think Dan is saying that at one time the price difference between the bare castings was only $68.
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Re: "A" vs "C" cylinder head

Post  bbf-falcon on March 31st 2015, 12:50 pm

DanH wrote:
garys gt wrote:How much does a C head cost ready to run with similar valvetrain as the A head would come with ?

differeance in cost including intake was $68 . That starting with bare A or C. heads.

that was several years ago price.  The C head can hit 490+ cfm with most port work done in the bowl area and the right valve job.
True,BUT that is where the real expence between the 2 really starts to separate with the BIG BIG jump in price going with the C's and the Shaft rockers.

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Re: "A" vs "C" cylinder head

Post  Lem Evans on March 31st 2015, 1:36 pm

Bruno's O.P. said "all out". So, if a guy were to get it all out, the wallet would be included in "all". Smile

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Re: "A" vs "C" cylinder head

Post  richter69 on March 31st 2015, 5:43 pm

Baller.....
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Re: "A" vs "C" cylinder head

Post  68formalGT on March 31st 2015, 7:09 pm

Wouldn't all out be A441's? (Like Frank Merkl's)
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Re: "A" vs "C" cylinder head

Post  maverick on March 31st 2015, 7:19 pm

"All out" is a perpetually moving target. That's the evolution Lem's talking about.
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Re: "A" vs "C" cylinder head

Post  Lem Evans on March 31st 2015, 7:44 pm

68formalGT wrote:Wouldn't all out be A441's? (Like Frank Merkl's)

Maybe but, O.P. was "A vs C"

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Re: "A" vs "C" cylinder head

Post  Lem Evans on March 31st 2015, 7:48 pm

maverick wrote:"All out" is a perpetually moving target.  That's the evolution Lem's talking about.

Yep, a decade old 'all out' don't work any more Laughing

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Re: "A" vs "C" cylinder head

Post  bbf-falcon on March 31st 2015, 9:13 pm

My definition of ALL OUT, usually pertains to cash or funds. Rolling Eyes

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Re: "A" vs "C" cylinder head

Post  DanH on April 1st 2015, 10:31 am

bbf-falcon wrote:
DanH wrote:
garys gt wrote:How much does a C head cost ready to run with similar valvetrain as the A head would come with ?

differeance in cost including intake was $68 . That starting with bare A or C. heads.

that was several years ago price.  The C head can hit 490+ cfm with most port work done in the bowl area and the right valve job.
True,BUT that is where the real expence between the 2 really starts to separate with the BIG BIG jump in price going with the C's and the Shaft rockers.
It was $68 including the shaft rockers for the C head. Remenber the valve train is the same, the A also has shaft rocker. head studs not included in the price, intake manifolds are.

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