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Old 06-14-2007, 06:16 AM
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What heads would i have

On a csb 350 -87,original pistons,lt1 Cam,headders,edelbrock rpm performance intake,650 holly.What heads do i have to get 300-350 horsepower?Can get these for a small price:3973493 and 458642.Is their any good?

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Old 06-14-2007, 12:37 PM
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neither of these are a high performance head. Keep looking....
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Old 06-14-2007, 12:50 PM
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Quote:
Originally Posted by jolle55
On a csb 350 -87,original pistons,lt1 Cam,headders,edelbrock rpm performance intake,650 holly.What heads do i have to get 300-350 horsepower?Can get these for a small price:3973493 and 458642.Is their any good?
The 493 is a 400 large chamber SMOG head, running with a flat top piston will yield about 9.5:1 compression but isn't very efficient and is crack prone.

The 642 is a Smogger 350 large chamber head, running it with a flat top would net about the same compression as the 493 head. Like the 493 it isn't very efficient and is very crack prone.

If either of these are in good shape, IE no cracks, and are rebuild-able with a flat top piston with an .020 thick gasket and .025 deck clearance, this would result in a compression ratio of about 9.4:1.

As I stated in another response to your blog, I think a Vortec head would be a better choice, but if you have these heads and they're rebuild-able, combined with an LT1 cam, I'm presuming you mean the 1992-1995 roller version of the LT1 and a flat top piston 250 hp or close to it is possible. The LT1 roller cam has a large LSA so it has good cylinder trap pressure which makes the mid range RPM dynamic compression ratio larger than the computed CR, since it was used in an aluminum headed reverse cooled engine this was OK; in a conventionally cooled cast iron headed engine, you've got to be a little careful to stay under the detonation limit. The Volvo being a relatively light car and if the rear gears are say 3.08 or more the engine should be fine.

Bogie
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Old 06-14-2007, 03:35 PM
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I meant the older LT1 cam,but i have also a 300hp 327 cam,is that good ?Can i take that cam to 3795896 (60cc) ,3973493,or 458642 and i can get from a freind these heads:333882 (76cc)
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Old 06-14-2007, 03:51 PM
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Quote:
Originally Posted by jolle55
I meant the older LT1 cam,but i have also a 300hp 327 cam,is that good ?Can i take that cam to 3795896 (60cc) ,3973493,or 458642 and i can get from a freind these heads:333882 (76cc)
The old so called 929 cam from the 300 horse 327 produces about the same power in a 350, it just peaks a couple hundred RPM sooner in the 350. You can push that a little more with a pocket porting in the smogger heads you have. You just want to clean up the casting below the valve seat. On the intakes you want to streamline the guide boss and enlarge the width between the boss and the wall on the side of the port that is adjacent to the cylinder wall. This will not only increase flow, but will increase swirl which is something these heads need. Not to much metal removal, the port walls are thin. On the exhaust side, you want to streamline the guide boss, smooth shapes together. Again you want to emphasis the area between the boss and the port wall adjacent to the cylinder wall, centrifugal force of the exiting gases naturally throw the flow to this outside wall so giving it a little extra space in that area is beneficial. Stay off the port floors for both intake and exhaust, enlarging this area encourages reversion flow which you don't want. An as ground finish whether done with a stone or carbide cutter is plenty good, no polishing. Why? put a drop of water on a piece of glass and try to blow it off, put a drop on a piece of 400 grit wer/dry sand paper. The answer will become self evident.

Bogie
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Old 06-14-2007, 04:03 PM
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Okey get bad in the head soon.Is very much reading for a beginner,but thats good.So if i say this ,327 cam and my 3795896 60cc heads or a pair of 3973493 (cleand up)76cc,what is the best?
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Old 06-14-2007, 05:50 PM
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Quote:
Originally Posted by jolle55
Okey get bad in the head soon.Is very much reading for a beginner,but thats good.So if i say this ,327 cam and my 3795896 60cc heads or a pair of 3973493 (cleand up)76cc,what is the best?
The 60 cc heads while attractive from a compression point of view have ports and valves that are way too small for a 350.

The 493 76 cc heads have the right size ports and valves for a 350, but their valves won't fit the bore diameter of a 262 and if they did the combustion chambers are way to big for a 262.

It strikes me that you're between the rock and a hard place in that you need the 262 in the car to satisfy the legal/license requirement. Then you want to convert to the 350 afterwords. The heads from the 262 can't really be used on a 350. While the 350 heads won't work on the 262 because the valve sizes won't fit into the small 3.67 inch/93.218mm bore and without running a domed piston there wouldn't be much compression even if you could get them on. Even my suggested Vortecs won't cover both, even though they have small combustion chambers which would solve the compression problem, the valves at 1.94 and 1.55 inch are way to big for the bore. So it looks like you're going to have to build both a set of heads for 262 and another set for 350.

I'm guessing the displacement police will look for block casting or part numbers, if they don't, one small block looks pretty much like another from the outside. Unfortunately a 262 or a 305 block can't be bored to 4 inches, if they could with a 350 crank, you'd have a 350 and could squeak by them with the right numbers for a tiny block. Unless they require you pull a head and let them measure the bore and stroke.

I'm telling you Texas! Actually I live in Seattle which was mostly settled by Scandinavians, your accent would be right at home in the Ballard section of the city. We have California SMOG laws which while not anything like what you've got, raise the technology bar pretty high for hot rodders. If you don't work in digital engine controls/electronic fuel injection, you're pretty limited in what you can put on the street here. I work for Boeing by day and build street rods by night so I'm familar with getting all this modern stuff into older or custom built cars. Plus my own ride is an 89 GMC S-15 pickup with a highly modified 95 LT1, Camaro power train, engine, suspension, brakes, tires and all 95 emissions welded into it. It's legal and it screams, stops and corners!

Bogie
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Old 06-15-2007, 02:07 AM
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Sorry if a had confused you.I gonna go to car tester whit my 350 but whit 262 number.Many people (almost everybody) do so.So its the 350 engine i gonna drive approx 1-2 year,then ,a new bigger expensive engine to start racing on the track.is this gonna work:493 heads, much jobs done on this heads LT1 cam or 327 300hp cam,rpm intake,holly 650,headders,hei.Good unexpensive recept,or what?I have a guy in Sweden who wants to trade heads whit my 3795896 and he had 462624 whit 2,02/1,6 valves but whit 7 bolt exhaust bolt holes,what does it means?Is this heads better for my 350?
And the last questions:

Is there any chans to buy stuff from were you live,and sent it to me in Sweden?

Last edited by jolle55; 06-15-2007 at 02:13 AM.
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