340cc or 360cc A460 head?

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340cc or 360cc A460 head?

Post  Rich Osmond on May 4th 2013, 9:53 am

All - I am seeking input on the best A460 cylinder head choice for a NA 547 engine (the A460 head is the best head allowed by rule...). The engine is a 4.500" bore (Will go larger later as I can go up to a 588) and a 4.300" stoke. Pistons give me 14.2:1 with an 87cc chamber and Lem has already provided a camshaft for the engine. The question is which A460 head am I better off starting with (will have either ported to maximize power)? Note - I won't be using nitrous or other power adder and the engine will be in a 3200# car with a Powerglide and 10.5" tire.

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Re: 340cc or 360cc A460 head?

Post  Barney on May 4th 2013, 10:12 am

You already have a custom cam but don't have cylinder heads?
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Re: 340cc or 360cc A460 head?

Post  bruno on May 4th 2013, 10:38 am

i would discuss that with Lem , if he already provided info for the cam design im sure yall have discussed the cylinder heads already ....

cast or sheetmetal ????
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Re: 340cc or 360cc A460 head?

Post  Rich Osmond on May 4th 2013, 11:45 am

I have a good set of ported 340cc heads which Lem used as a basis for the cam, but interested to know if there is any gain to be had with my combination and the larger heads.

I have to run a cast intake.

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Re: 340cc or 360cc A460 head?

Post  dfree383 on May 4th 2013, 11:49 am

How are they flowing?
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Re: 340cc or 360cc A460 head?

Post  Lem Evans on May 4th 2013, 11:54 am

A ported set of 340s are nolonger 340s. They could be 355cc, 362cc, etc. Have you cc'ed them?

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Re: 340cc or 360cc A460 head?

Post  bruno on May 4th 2013, 11:59 am

Rich Osmond wrote:I have a good set of ported 340cc heads which Lem used as a basis for the cam, but interested to know if there is any gain to be had with my combination and the larger heads.

I have to run a cast intake.


max hp build ???? max rpm ????
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Re: 340cc or 360cc A460 head?

Post  Rich Osmond on May 4th 2013, 12:11 pm

Working on gathering the additional info now. I have flow numbers but confidence in them is not high. I will get back to you on flow numbers and port volume.

Lem - I will call you when I have the data. Thanks!

Max HP build.

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