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 Post subject: Re: New Engine Build
PostPosted: Fri Jan 26, 2018 5:01 pm 
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Joined: Mon Oct 29, 2012 9:05 am
Posts: 2417
I would need to know if you intend to use OEM style lifters or link bars. The base circle is different on the OEM style.

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 Post subject: Re: New Engine Build
PostPosted: Sat Jan 27, 2018 6:30 am 
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Joined: Wed Jan 24, 2018 1:46 pm
Posts: 15
link bar only.


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 Post subject: Re: New Engine Build
PostPosted: Sat Jan 27, 2018 6:34 am 
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Posts: 2417
Typical standard base circle stuff then.

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 Post subject: Re: New Engine Build
PostPosted: Sat Jan 27, 2018 6:48 am 
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Joined: Wed Jan 24, 2018 1:46 pm
Posts: 15
sounds boring ;)
lets call it high sopisticated, extraordinary high performance rocket technologie cam or evil grind cam. This would be sound even better! :twisted:


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 Post subject: Re: New Engine Build
PostPosted: Sat Jan 27, 2018 7:10 am 
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I prefer to call them "non-universal" camshafts that are engineered to optimize individual engine characteristics. :D

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 Post subject: Re: New Engine Build
PostPosted: Tue Jan 30, 2018 12:21 pm 
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Joined: Mon Oct 23, 2017 9:53 am
Posts: 177
I just dynoed a engine with similar flat tappet cam. Only differences were 9.3 comp, cast iron oc 4v heads and torker intake. 470hp@6000 and 421ftlb at 5000. Power curve was still headed up but owner wouldnt rev past 6000. I would think you combo be close to that. Id say your a smidge light on cfm but thats me. The chi seem to work fine if you light on carb cfm. I think your cam for your purpose not far off.


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 Post subject: Re: New Engine Build
PostPosted: Tue Jan 30, 2018 12:54 pm 
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The CHI heads all have very high velocity. I'd say the 2V heads are probably 20-30 cfm over the 4V heads, which should require less camshaft duration to get to the same spot.

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 Post subject: Re: New Engine Build
PostPosted: Tue Jan 30, 2018 1:57 pm 
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Joined: Mon Oct 23, 2017 9:53 am
Posts: 177
So you are saying the 2v head flows 325+ cfm?Im saying hes light on carb cfm.I would like him around that 750-780cfm. I see the 215cc ported chi around that 318-320 cfm range.


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 Post subject: Re: New Engine Build
PostPosted: Tue Jan 30, 2018 2:29 pm 
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They will go a solid 300-315 easily, with the way they are set up....2.100" valve. Most of the unported factory heads with a factory valve job that I see here will roll around 270-280.

The larger 3V and 4V CHI heads will hit the 320-330 mark here. A ported 3V head opened up to about 240cc (mainly bowl work, no port opening change) will go about 380 cfm. All excellent pieces, they are my go-to aftermarket head.

A 750-780 would be where I would put him too, even with the CHI's.

Factory 4V heads on a 355-357 inch bottom end and a 230-ish @ .050" hydraulic roller will generally get me a 6200 rpm peak. He needs to go quite a bit smaller than that to get the peak down and go for the low/mid range power that he's looking for with the CHI heads.

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 Post subject: Re: New Engine Build
PostPosted: Tue Jan 30, 2018 3:12 pm 
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Joined: Mon Oct 23, 2017 9:53 am
Posts: 177
With those small port heads and that intake and small carb if he uses them im not sure he would crack to far over 6000 for peak hp. Would have to throw it on dyno sim.If he has cam already id say he's ok. If he doesn't he could go your way. My therory is after a year he will be used to car and want the extra cam and carb we all seem to change up. Your guys call. I think hes close. If were my personal car i would have even more duration.


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