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 Post subject: SCM 4v Port Volumes
PostPosted: Wed Oct 10, 2018 1:02 pm 
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Joined: Tue Jan 30, 2018 12:09 pm
Posts: 8
Does anyone have port volume specs on the SCM 4v stand port vs large raised port? Scott's website is in bad need of an update and searching around the web gave tons of flow data, but no volumes that I saw.

Looking at head options for a street/strip bruiser 408. Engine would be pump gas 93 octance, solid roller, with a fair bit of street miles. Goal is low 10's in a 3000 pound car+driver.


Thanks!


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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Wed Oct 10, 2018 1:29 pm 
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Joined: Mon Oct 29, 2012 9:05 am
Posts: 2454
Have you looked at CHI?

One of my customers could run 10.50's with a 408 on pump gas, with some 208cc CHI heads. Your goal is not out of line for pretty much any aftermarket Cleveland head, but I'm just really fond of the CHI pieces. Top notch stuff.

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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Wed Oct 10, 2018 6:56 pm 
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Joined: Fri Mar 01, 2013 9:58 pm
Posts: 200
I've used both sets of heads, one on a 393 build (small port street head,small solid roller under 250@50) which made a documented 450 odd HP at the rear and another build which used the large port ,large chamber deal at 440 cubes that went north of 750 flywheel HP for a street strip deal.
Great heads, IMHO, comparable in terms of quality with the CHI offerings.
The small port head would more than likely get you there to be honest.
Might be worth having a look at AFD heads as well. I'm just about to start doing a 427 clevor using the AFD 4v head. Very good value for money.


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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Fri Oct 12, 2018 10:20 am 
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Joined: Tue Jan 30, 2018 12:09 pm
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The CHI 208's with CNC porting look pretty solid, very impressive numbers for a 208cc runner! Would really like to see an in depth comparison of CSA, flow velocities, and turbulence between them and Scott's heads. I see the SCM numbers are a bit better, especially in the critical low lift regions, but without knowing port size of the SCM's it's hard to know if it's really a fair comparison to the CHI's. Hence my asking if anyone knew the dimensions :)

Thanks!


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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Fri Oct 12, 2018 4:22 pm 
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Wish I could be more more help, but I've never used a set of his heads.

Those 208cc heads were later hand ported to 240cc and flowed 380 cfm. The heads went on a 434 inch Clevor and the Mustang runs a 9.60 at 141 mph.

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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Sun Dec 02, 2018 4:55 pm 
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Joined: Tue Oct 30, 2012 4:50 am
Posts: 50
Did you digitize those ported 208cc heads?


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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Sun Dec 02, 2018 5:36 pm 
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Sure did.

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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Mon Dec 03, 2018 1:15 pm 
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blykins wrote:
Sure did.

Brent, do you have any pictures of the CHI 208 that were opened up to 240, I just finished hand porting my 208's out to 248. They will be going on a 427 trackboss (cast iron). I talked to Mark at CHI and he said they take that head out as far as 258.


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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Mon Dec 03, 2018 1:29 pm 
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You wouldn't be able to discern between a 208 and 240 by looking at pictures. The port dimensions at the intake flange don't change at all. All of the volume changes are down in the throat/bowl area.

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brent@lykinsmotorsports.com


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 Post subject: Re: SCM 4v Port Volumes
PostPosted: Mon Dec 03, 2018 1:58 pm 
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Joined: Wed Dec 14, 2016 6:41 pm
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blykins wrote:
You wouldn't be able to discern between a 208 and 240 by looking at pictures. The port dimensions at the intake flange don't change at all. All of the volume changes are down in the throat/bowl area.

Using this drawing is what I used as a guide from CHI, they move the port .100 up and .100 away from the pushrod.


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