C5R heads
TECH Enthusiast
Joined: Sep 2002
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From: Clinton Twp. Michigan
Re: C5R heads There is a difference in the shape of the intake ports, as the C-5R heads are shaped more like the conventional BBC rectangle ports, the Valve degree is different than that of an LS1 head, they use different size valves in both stem diameter, and length, they are pretty much a custom made valve, different valve seats. But they will bolt right up to any Gen 3 block, as long as the bore is large enough to not shroud the valves, but you will need either a custom made intake, or a Kinsler Fuel injection set-up.
TECH Enthusiast
Joined: Sep 2002
Posts: 658
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From: Clinton Twp. Michigan
Re: C5R heads If you are looking to purchase a set, my roomate has an actual set of C5-R heads off a real race car, they are complete with valves, and jesel rocker set-up. Email me if you are interested, as he is no longer doing the project, the car is gone now, he also has a C5-R block still in the GM crate, never used, just removed to be drooled on <img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" /> he is selling these goodies now to free up money to purchase a new project.
Thread Starter
Staging Lane
Joined: Sep 2002
Posts: 72
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From: Georgia
Re: C5R heads Can Crane 1.8 roller rockers be used or would I have to use the Jesel rockers? If I can't use the Cranes, how much are the Jesels and from where?
38cc is pretty small, what dish piston would I need to bring the compression to a streetable 10.8-11.0? Do cube matter on how much dish I would need?
Do these heads change the rules for pushrod length?
38cc is pretty small, what dish piston would I need to bring the compression to a streetable 10.8-11.0? Do cube matter on how much dish I would need?
Do these heads change the rules for pushrod length?
Re: C5R heads </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NeeleymanZ28:
<strong>38cc is pretty small, what dish piston would I need to bring the compression to a streetable 10.8-11.0? Do cube matter on how much dish I would need?
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">To run the right valves, you need a bore of at least 4.125".
- 3.662" crank + 0.074" gasket + -24cc dish pistons = 11.3:1 compression ( 391 CID )
- 4.000" crank + 0.074" gasket + -24cc dish pistons = 12.2:1 compression ( 427 CID )
I have not heard of a dish piston being larger than -24cc.
<strong>38cc is pretty small, what dish piston would I need to bring the compression to a streetable 10.8-11.0? Do cube matter on how much dish I would need?
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">To run the right valves, you need a bore of at least 4.125".
- 3.662" crank + 0.074" gasket + -24cc dish pistons = 11.3:1 compression ( 391 CID )
- 4.000" crank + 0.074" gasket + -24cc dish pistons = 12.2:1 compression ( 427 CID )
I have not heard of a dish piston being larger than -24cc.
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Thread Starter
Staging Lane
Joined: Sep 2002
Posts: 72
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From: Georgia
Re: C5R heads So this is not possible on a lq4 with 4.06 bore and 4.125 stroke? If not that's fine, this is why I post here, great info. I guess I should have posted my application, oops. Is this setup doable?
Do these heads come finished up or will I need a vendor to take care of that?
Do these heads come finished up or will I need a vendor to take care of that?
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Verdad Gallardo Re: C5R heads </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NeeleymanZ28:
<strong>So this is not possible on a lq4 with 4.06 bore and 4.125 stroke?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">With a 4.06 x 4.125 setup, you could do 2.1 intake and 1.6 exhaust values, but the heads will not flow to their full potential. With this bore and stroke combo with a 0.074" gasket and -24cc pistons, the compression level will still be around 12.3:1. A thicker gasket could be used to drop the compression level down more, but I do not think it would be a good idea. Going with a 4.125" stroke, you would need to use 6.2" rods, which I do not think they could support a -24cc piston. I would check with Diamond Pistons, on the right, to make sure. With a -28cc piston, the compression level would still be 11.5:1.
<strong>So this is not possible on a lq4 with 4.06 bore and 4.125 stroke?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">With a 4.06 x 4.125 setup, you could do 2.1 intake and 1.6 exhaust values, but the heads will not flow to their full potential. With this bore and stroke combo with a 0.074" gasket and -24cc pistons, the compression level will still be around 12.3:1. A thicker gasket could be used to drop the compression level down more, but I do not think it would be a good idea. Going with a 4.125" stroke, you would need to use 6.2" rods, which I do not think they could support a -24cc piston. I would check with Diamond Pistons, on the right, to make sure. With a -28cc piston, the compression level would still be 11.5:1.
Thread Starter
Staging Lane
Joined: Sep 2002
Posts: 72
Likes: 0
From: Georgia
Re: C5R heads ls1290, I appreciate your timely responses. Looks like I will just buy a set of SPDC 2002 LS6 bare heads and have them stage III'd by a vendor. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
ZYA_LTR, sent you a pm
ZYA_LTR, sent you a pm
Re: C5R heads </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NeeleymanZ28:
<strong>ls1290, I appreciate your timely responses. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No problem. The C5R heads flow like a SOB, but they are design to be full out race heads. To get the compression level down to something streetable, a fair amount of effort needs to be done.
<strong>ls1290, I appreciate your timely responses. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No problem. The C5R heads flow like a SOB, but they are design to be full out race heads. To get the compression level down to something streetable, a fair amount of effort needs to be done.
Re: C5R heads </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NeeleymanZ28:
<strong>Does anyone have flow numbers from these heads?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I have a set of C5R heads that are almost done. They are flowing 377/250 in/ex on our Superflow 600 bench. With an exhaust pipe, it is 20-25cfm more. This is a drag race port job.
We are also designing another port for C5R heads and will have them available as a CNC port job. We are looking for 400cfm on the intake side. These are in the works and will be available early in the new year.
Please give us a call for details toll free at 866-539-5605 and ask for Wade.
Thanks,
Dave DiLuca
www.agostino-racing.com
<small>[ December 11, 2002, 02:11 PM: Message edited by: SLED28 ]</small>
<strong>Does anyone have flow numbers from these heads?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I have a set of C5R heads that are almost done. They are flowing 377/250 in/ex on our Superflow 600 bench. With an exhaust pipe, it is 20-25cfm more. This is a drag race port job.
We are also designing another port for C5R heads and will have them available as a CNC port job. We are looking for 400cfm on the intake side. These are in the works and will be available early in the new year.
Please give us a call for details toll free at 866-539-5605 and ask for Wade.
Thanks,
Dave DiLuca
www.agostino-racing.com
<small>[ December 11, 2002, 02:11 PM: Message edited by: SLED28 ]</small>
Re: C5R heads </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Pro Stock John:
<strong>Do the C5R's have different exhaust ports and thus require different (custom) headers?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">They will work, but you won't get the full benefit out of the port location.
<strong>Do the C5R's have different exhaust ports and thus require different (custom) headers?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">They will work, but you won't get the full benefit out of the port location.
Re: C5R heads The heads do have the same shape exhaust ports, so the headers will bolt on the heads fine. Since the heads have been angled milled, the headers will not hook up with the rest of a stock exhaust system.
