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Old 02-12-2003, 11:16 AM
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Post 350 question?

I'm building a 350 to go in my 83 CJ-5. The block is a 4 bolt main bored .30 over. I using a set of 58cc 305 heads,holley 670 truck avenger,weiand stealth intake,hypereutetic pistons(9.6:1 compression),Comp cam 280/480 and Flowtech block hugger headers. What do you guys think about this set-up? I know the heads are 58cc but I had them already reworked for another 305 project that ended up being scrapped. Also what HP and tourque can I expect from this set-up?

[ February 12, 2003: Message edited by: CR SETH ]</p>

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Old 02-12-2003, 12:31 PM
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if you don;t port them you will be into the 10-10.5 :1 compression,

or even higher, id have them ported, but the rest sounds good

you whould be around 300hp
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Old 02-12-2003, 12:45 PM
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The pistons are dish top and the book said 9.6:1 compression. I wan't to be able to rum pump gas.
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Old 02-12-2003, 01:58 PM
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Sounds pretty good to me. It should run well in the cj5. Id guess around 325-340 horses. HG
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Old 02-12-2003, 02:07 PM
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With those heads and cam etc.. you'll prolly be at like 290-310hp.I have a 350 with 305 heads with undecked block and 039 gasket you'll have 9.53:1
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Old 02-12-2003, 03:49 PM
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Loud malibu...im not trying to be a d!ck here but what does porting have to do with your compression ratio???
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Old 02-12-2003, 05:04 PM
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[quote]Originally posted by nickel333:
<strong>Loud malibu...im not trying to be a d!ck here but what does porting have to do with your compression ratio???</strong><hr></blockquote>
Oh please, be a d!ck. I too would like to know how removing material that's not in the combustion chamber is going to affect compression.
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Old 02-12-2003, 05:15 PM
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You damn fools!!! Don't you know that if you port the heads the air falls in and out quicker and so there isn't none of that damn compression?

What kind of mechanics are you anyway? Geeeeeeeeeeez.

Everyone knows THAT!!!!!!!!

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Old 02-13-2003, 04:08 AM
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Thanks for the replies! I've been reading this board for about 2 weeks and I really like all the information here.
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Old 02-13-2003, 01:27 PM
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Always somethin funny to read too!
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Old 02-13-2003, 01:40 PM
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If you wanna be able to run pump gas you should keep your compression under 10.0:1 or less. the 9.6 or what you have now is pretty good but if you wanna do higher you might need to get higher octane gas. i'd say you would make between 300-325 hp
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Old 02-14-2003, 04:19 AM
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I was shooting for around 9.5:1 compression so I could run pump gas with the timing set perfect. The 305 heads shouldn't hinder this motor since it won't see over 5000 RPM in the CJ-5. I guess my next project will be installing a new tranny when this one grenades.
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Old 02-20-2003, 12:05 PM
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porting & polishing the heads will drop the comp. if you do a full porting job on them.
the final stage of porting & polishing is porting the chambers to advoid shrouding of the exhaust valves (3/16" from valve to wall is needed)which most production heads pre 71 chevy's don't have, and then polishing also removes metal as well....and Nickel he's right & you are a dick
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Old 02-20-2003, 03:08 PM
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I would like to here from some of our machinists here, I know we have a few. Each set of 302 Ford heads that I've had done both times the machinist said that my flow would improve along with the added strength of switching to threaded rocker studs,pushrod guideplates, crane springs, etc., but never any mention of compression loss. My understanding was that he wasn't removing material from the combustion chamber. Can we get a general consensus from some of our machinists here? Is it standard practice to remove material from the combustion chamber during a port/polish job and how much of a change are we really looking at if such material is removed.
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Old 02-20-2003, 03:46 PM
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dmorris- look up Standard Abrasives . com, Motor Sports Div.
step 5, paragraph 3
and besides he just wants to get down to pump gas,without spending a fortune.
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