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Old 06-17-2008, 02:11 PM
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alright, Im gonna leave you guys alone after this. I have one more question. Like I said, im putting the kb-120 pistons in it now. This should put me back to where i need to be as far as the quench height. I have pretty much decided on the comp xr276hr cam, it was between that or the xr282hr. I think the 276 will do better for my street duties. Now the last question, I am trying to decide on heads. I am leaning toward the aluminum fast burns from gm. They are a little more than the cast vortecs, but not quite as much as some of the higher end brands such as the afr's. Do you guys think it would be worth it to upgrade to the fast burns or not?

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Old 06-17-2008, 02:22 PM
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Red the Vortecs will be better for street duty, the FastBurns have a much larger intake runner. It just depends what you intend to use the car for.
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Old 06-17-2008, 02:25 PM
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its just gonna be a street car, i tore up too many parts and spent too much money when i was going to the track. I guess ill just go with the vortecs. I just hope im ok with the iron heads and the pump gas.
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Old 06-17-2008, 05:55 PM
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You should be in good shape with the Vortecs. They have a very efficient & detonation resistant design. Keep the compression around 9.5to1 and you could run 87 octane with timming set right. Bump the timing up and run 92-93 when you want to play.
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Old 06-17-2008, 07:17 PM
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well the chart says 10.2 with 64cc heads?

http://kb-silvolite.com/performance....tails&P_id=157

Last edited by redbandit98; 06-18-2008 at 10:26 AM.
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Old 06-19-2008, 11:34 PM
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Be sure you follow KB's instructions on the top ring gap, which needs to be 50% larger than what most other pistons require.

I suspect you'll be OK with 10.2:1. Somebody on this board mentioned that he had no detonation problems with an engine basically the same as what you're building, except for a Comp 268 cam.

I checked Comp's site just now and couldn't find a CR recommendation, but I found Crane's recommended range for their 276* hydraulic roller, which is 8.75 to 10.75:1.

Last edited by jimfulco; 06-20-2008 at 12:36 AM.
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Old 06-20-2008, 07:40 AM
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well, its getting down to the nitty gritty. I did some number crunching, i think im pretty close on it. With the standard size deck, pistons (7cc flat tops), and .035 gasket the calulators i used came up with a 9.74 cr with 64cc heads. With 72cc heads, it put me at 8.98. I dont know if im comfortable running that high compression with the 64cc iron head vortecs. I mean I hear oh yea thats fine , then I read in some magazine article that your crazy to run anything over 9.2. on iron heads. I dont know. . As far as the 10.2 that is thrown out the window. I emailed keith black and they told me their figures are all based on a zero deck block.

Last edited by redbandit98; 06-20-2008 at 04:31 PM.
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Old 06-21-2008, 10:39 AM
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ok, the numbers are in. I picked up my shortblock today and got it home and measured it. The piston to deck height was .024 I emailed keith black and they told me their pistons were designed to be ran from .040 to .055 quench. With the gm .028 gasket i would be in their recommended quench. The only thing is Im worried about the compression with the 64cc heads. Ive convinced myself to go ahead and get some 76cc heads. This would put me right at about 9.1. I have been searching for some good iron 76cc heads. I saw where rhs makes some vortec heads that actually have the 76cc chambers. The only thing is I cant seem to find any with a straight plug that are already assembled. No huge deal but i would like to find a set that are ready to go. The thought of buying some in a 64cc in aluminum has crossed my mine, but they are some serious coin.
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