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Old 04-07-2005, 10:12 PM
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Buying new heads - need general info

I broke one of the studs on my current GM 462624 heads and now I'm trying to figure out if I should have these redone with a 5 angle valve job or switch to a different head. However, I'm not sure what to look for when shopping for heads.
Valve size, chamber size, intake/exhaust runners ?
I had one guy tell me I should use 441 heads.
Summit recommended their brand SUM-152123 heads.

What should I take into consideration when looking at heads ?

It is a 010 Chevy 350 block, Edelbrock Performer Intake, Edelbrock 750cfm carb
Camshaft - 465 lift with 1.5 rockers (I have 1.6 ratio rockers) advertised Duration:282 - Duration At .050:224

I am not trying to build anything super just would like to have a good quick engine for a street car that is not an everyday driver.

Thanks, for any info you can provide.

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Old 04-08-2005, 11:42 AM
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Your best performance bet without going aluminum would a set of Vortecs, but you would have to buy a new intake manifold, and rockers, so I dont know if you would want to go that route. Other than finding a set of ported double humps, you could look into a set of dart iron eagle 180's.


Adam
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Old 04-08-2005, 12:17 PM
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I was advised to try the Edelbrock performe rpm heads.
Great all round rpm heads and there alluminum and you cant go wrong with the brand name on em. Plus have you ever noticed the resale value on em on Ebay?
Chk em out. Bout perfect for your cam and setup. HG
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Old 04-08-2005, 12:36 PM
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Dart offers a great line of heads in the 700-900 range. Much less expensive than aluminum heads.

I'd be looking at a head in the size of 170-190 intake runner CC. Go with whatever size combustion chamber you already have (unless you want to run higher compression). Valve size on after market heads is normally 2.02/1.64. Not realy much choice there but those valve sizes are plenty for what you need.
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Old 04-08-2005, 03:04 PM
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heads

Buy aluminum heads. They weigh less. All machining is already done. Everything is brand new. Edelbrock perf/rpm is the overnight delivery of aluminum heads and they are reasonably priced. AFR puts out a better head, more money, and a waiting list.
Quote:
I am not trying to build anything super just would like to have a good quick engine for a street car that is not an everyday driver.
You have a great package for hauling gravel.

Your cam and rocker package is giving you about .498 lift. Get a Holley 650 DP with a Perf/RPM intake. If you want quick.
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Old 04-08-2005, 03:38 PM
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While I agree that aluminum heads in most cases are superior, dont dismiss Dart's cast heads especially if your budget is limited. If you are running stock compression (assumed in the 9-9.5 range) you might actually benefit from having cast over aluminum heads. Expect to pay at least 200-300 more for an acceptable aluminum head (meaning one equal to the performance of a Dart head).
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Old 04-08-2005, 03:51 PM
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Although I agree that the Dart 180s would probably be your best bet, if you wanted to spend a few hundred fewer dollars, some heads like the ones below may be an idea. You would have to check out if the springs are right for your cam, and it is always a risk buying used stuff, but these seem like a pretty good deal if they would work for you.

http://www.racingjunk.com/exec/ca/vi...ads-50000.html

Adam
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Old 04-08-2005, 03:59 PM
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Whatever you do, DO NOT spend any money on the 624s.
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Old 04-08-2005, 04:00 PM
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Old 04-08-2005, 06:15 PM
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Hey Guys thanks for the info. I found that the 624 heads are 76cc and came with either 1.72/1.5, 1.94/1.5 or 2.02/1.6 valves (not sure what mine are)
I would like to keep all the other components I currently have because they are not all that old.
One problem I've had in the past is it's run rich, I'm thinking the 750 Edelbrock carb is a bit on the big size and was thinking I could remedy that with new heads. Not sure I want to spend the money on aluminum and will be running basically stock compression.

What valve size should I be shopping for ? the 2.02/1.6 ? and basically same chamber as what I have now ?

Why is it not wise to rebuild my 624 heads ? Is new just better
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Old 04-08-2005, 09:57 PM
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The cost difference is minimal.

For the little extra cash you get

1.) Much better flowing ports outta the box( Smething in the 180cc area would be perfect.)

2.) A better designed combustion chamber that burns fuel better and increases power.

3.) Bigger valves already installed (I would recommend 2.02/1.60).

4.) Your choice of combustion chamber size (I would recommend something in the 64 cc variety.)

5.) The heads and all the components are Brand spankin new.

Just to name a few.

Just call a few shops and get quotes for rebuilding your heads with the installation of 2.02/1.60 valves if they dont have them already. Then compare the cost of reworking your heads to buying the NEW aftermarket pre-assembled heads like the DARTS someone mentioned. I think you'll agree the added cost if any would be worth it.

As for the carb I would also recommmend somethin in the 650 cfm range.

Doc
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Old 04-09-2005, 03:16 PM
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your motor carb. and cam are all good but i would not spend a dime on those 624 heads.those and the 882 casting's are with out a doubt the two lightest castings chevy ever made.if you don't have to spend that much money to get the 441's in shape they are good heads.if you have the money to spend the dart iron eagle 180 cc are good heads to have but not everyone has that much money to spend.the 624's came on vette's but if you ever get them hot they'll crack as will the 882's.i have a chevy parts interchange book that in describing the different heads goes out of its way to say if you have a set of those heads get rid of them.i bought two motors with those heads on them and both times they were trash.
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