Custom comp cam

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Custom comp cam

Post  tconnection on August 23rd 2011, 10:13 pm

I have an aheaded 580ci that's gonna be about 14:1 and i wanted it to be an n/a motor. i have a ? about my cam.
L/S 114, 839/780. 3000lb car, c6, 3.73, 28's. Will this cam be lazy? about what size converter do i need?
Thanks Earl

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Re: Custom comp cam

Post  rmcomprandy on August 23rd 2011, 10:38 pm

tconnection wrote:I have an aheaded 580ci that's gonna be about 14:1 and i wanted it to be an n/a motor. i have a ? about my cam.
L/S 114, 839/780. 3000lb car, c6, 3.73, 28's. Will this cam be lazy? about what size converter do i need?
Thanks Earl


The durations @.050" and @"off the seat" will will have a fair amount to do with your answer.

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Re: Custom comp cam

Post  dfree383 on August 24th 2011, 12:40 pm

What Randy Said, Need the complete specs on the cam and the build.

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Re: Custom comp cam

Post  tconnection on August 24th 2011, 10:27 pm

I/C is also 114, @.050 is 283/306 and adv. is 316/348. 4.500 stroke 6.8 rod and 4.530 bore, diamond pistons gas ported.The new style aheads mainly just polished ports and chambers, new style intake with roughness lightly removed. And aiming for .0025 on the rods and .0030 on the mains. Im figuring a 1250 carb. A460 block, cam double pinned with 7/16 bolt.
Thanks again

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Re: Custom comp cam

Post  rmcomprandy on August 24th 2011, 10:47 pm

tconnection wrote:I/C is also 114, @.050 is 283/306 and adv. is 316/348. 4.500 stroke 6.8 rod and 4.530 bore, diamond pistons gas ported.The new style aheads mainly just polished ports and chambers, new style intake with roughness lightly removed. And aiming for .0025 on the rods and .0030 on the mains. Im figuring a 1250 carb. A460 block, cam double pinned with 7/16 bolt.
Thanks again


Simply an opinion:

Sounds like a decent cam for a high compression, big load of nitrous, engine or N/A with a tunnel ram and two 4's and maybe only some nitrous too.

To much stroke for a really high RPM engine.

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Re: Custom comp cam

Post  DanH on August 24th 2011, 11:17 pm

that cam will.. as you callit --Flat , flat till the rpm is up . will have other problems with it in a n/a engine

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Re: Custom comp cam

Post  tconnection on August 24th 2011, 11:40 pm

C6 trans gear ratio, 3.73 and 4500-5500 stall converter. Wouldnt that kick it up in the rpm's pretty quick?

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Re: Custom comp cam

Post  Lem Evans on August 25th 2011, 8:15 am

tconnection wrote:I have an aheaded 580ci that's gonna be about 14:1 and i wanted it to be an n/a motor. i have a ? about my cam.
L/S 114, 839/780. 3000lb car, c6, 3.73, 28's. Will this cam be lazy? about what size converter do i need?
Thanks Earl

It'll need about a 6,100-6,300 stall converter. The exhaust duration is too much for a N.A. engine i.m.o.

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Re: Custom comp cam

Post  tconnection on August 25th 2011, 9:49 pm

About how much nos is recommended to make this cam not be lazy?
How about a spec for a powerful n/a cam for this combo.

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Re: Custom comp cam

Post  rmcomprandy on August 25th 2011, 9:56 pm

tconnection wrote:About how much nos is recommended to make this cam not be lazy?
How about a spec for a powerful n/a cam for this combo.


Let's put it this way, that cam is about the same size as I.H.R.A Top Sportsman 632 Chevrolet engines were using about 15 years ago.
Nitrous wasn't as sophisticated back then and a 400 to 500 shot was not abnormal. AND, oh yea, they left at around 6,000 back then.

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