head swap on a 60 over 350 chevy! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-09-2010, 05:07 PM
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head swap on a 60 over 350 chevy!

guys its me again lol, ok my engine was added up on the desktop dyno @ 357hp, 406tq given the binnifit of dout here ok, kb flat tops, with 280h comp cam,1.5 harlland sharp roller rockers, with a 1850 600 carb, a eldebrock performer eps, with 882's milled 125 thousands to get the 10.1cr 1.94/1.50 valves, iv added a 3310 750 sence then, now i want more hp like dart plat alm 215cc heads and a rpm air-gap and go up to a comp 305h, would someone like to make hp&tq guess???? thanx guys the info is greatly app!!

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Old 07-09-2010, 05:45 PM
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The most you will make with the 882's is around 335hp.
They are a huge horsepower bottle neck.

One of the major keys to engine power is cylinder head air flow.
You cannot make power without it.

You will waste more money max milling 882's than starting with a small chamber head for cr.
Once you get up in cam duration of the 305H go with a solid lifter cam as the motor will be rpming pretty high. You will make more power and go faster with a solid cam.

www.iskycams.com
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Old 07-09-2010, 05:57 PM
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ok what about the 215cc darts??
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Old 07-09-2010, 05:59 PM
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im wanting to go from the 882's to the dart 215's, and the rpm air-gap, and yes the 305 comp
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Old 07-10-2010, 05:25 PM
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anymore info guys??
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Old 07-10-2010, 06:54 PM
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Call DART!!!!!!!!!!!!!!
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Old 07-11-2010, 05:08 AM
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I would move up to better heads as you`ve mentioned, but I wouldn`t want to go up that high. You didn`t mention if this is a street machine, what transmission or what rear gear, or the bottom end of your 400.
If you plan to street drive it or track side, I would go up to 195cc runner heads. I would go up a step on the cam to the 292H. If your car has power brakes this cam will be borderline without a vacuum reserve. If you use the 305H you will need a vacuum reserve. If your using a automatic you`ll need at least a 3500 stall converter.
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Old 07-11-2010, 01:37 PM
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id like to be able to take it to the dragstrip, and take it out for a day drive, i bulit the rear 8.5 a year ago with a posi 3.73 gear, the tranny (th350) has ben bulit with a B&M shift kit, with a 2200 stall converter, i need a bigger stall as it is now, as for the engine the for the bottom end, i'll be getting ether a scat 9000 or a egale cast steel crank good to 500hp, i have a set of those "x" rods or "pink" rods as the older guys called them, they say they are good, they are pushing kb flattop pistons with 4v, the block is a 4 bolt main.... my buddy recomends the 215 head with a 2.05 valve size he said bc that will give good flow and give room to move up on the camshaft like the 305h, and run 93 octane with octane booster, 110 race gas here is almost 8 bucks a gallon, so the 93 with the booster is cheaper and it would do good on it....
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Old 07-11-2010, 01:43 PM
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And how much is octane booster per Gallon?

With the money you would waste on octane booster, invest that into cylinder heads that make much more HP and set the engine compression ratio so it will run without octane booster on pump gas.

You will go faster , farther, longer for less.

AFR 195cc eliminators. 10.5:1 cr Max Isky Z-27 cam 201027 1.6 rockers.
RPM air gap 750cfm DP carb.

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Old 07-11-2010, 02:31 PM
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As these guy's are recommending, and the regular run of the mill octane booster is a absolute waste of money. You run 93 oct and add a can +6 octane booster, what do get? 99 oct....nope, you get 93.6. Each advertised point is only 1/10 of a point, just google "octane booster myths" lots of stuff to read from very knowledgeable folks.
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Old 07-11-2010, 04:01 PM
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so why not the dart 215's?? i want the most out of my 350,its not going to be driven every day... the 195's prb support up to 450hp?? the 215's prb do more??
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Old 07-11-2010, 04:21 PM
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the 215's and the 305h or solid cam combo is not worth messing with?? may i ask why? keep in mind guys, i would like to get the "most" out of my 350...sorry im a comp cam man, im sure everyone has there own likeings of cam brands, i so happen to like the compcams, no offence to anyone.. and thanx again guys, keep feeding me with info, i love reading about this..
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Old 07-11-2010, 07:10 PM
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You keep asking for info and opinions but then you don't want to take the good advice several have given. I doubt you will get many more replies.
Terry
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Old 07-12-2010, 08:33 AM
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You have a 350. You want to stick heads on it with massive runners, the bigger the runner the more loss of velocity and the more loss of low end power. The 305H cam says "for use on large cubic inch small blocks" if you plan to street drive it, you won`t like it. If you couple the cam and 215 heads you`ll have to install a 4500 stall and 4.88 gears which pretty much takes out streetability. If you had a 400 it wouldn`t be so bad, as there would be cubes to make up for it, but a 350 is a bit too risky. With 215 heads and that cam you`ll have to rev the stink out of it to make any power.
Do as you wish, I`m only trying to tell you if you take the route your planning, your not going to like it. The next hassle will be setting up a vacuum reserve so the power brakes still work. You`ll also have to add a open plane intake which will kill more bottom end power. The performer eps is pretty much over at 5500 and if your power band starts at 4000 you`ll have 1500 rpm of rev before the power drops off, not quite worth it.
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Old 07-12-2010, 05:06 PM
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thanx guys, im not a expert on everything, and there for im going to ask questions, not meaning to be a pain in the rump, only way to learn is to ask rite? ok what about the comp292h, with the sportsmen 2's with the 200cc intake runners, would that be better on my 350?? yals help and info is great..
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