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  #16 (permalink)  
Old 09-04-2013, 04:15 PM
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Originally Posted by jokerZ71 View Post
Vortecs flow approx 234 or so outta the box & are advertised to support 400HP as is,so'with your heads flowing 212,they will need some work.You do have slightly larger ports,so,IDK how much work we're talkin about.That being said,a set of aftermarket heads would definitely be a good investment,or,having someone rework yours.Get pricing for both & weigh the results.Keep in mind,that you having more flow & velocity is always a good thing.You may decide later to up your power requirements. If I had to guess & assuming you will have all the work hired out,I'd say you could buy a good set of heads for not much more than you'll have invested in yours.I would think that gaining another 22 cfm or so would take some substantial work.Not to mention new guides,seats,valves,springs,& machine work.You could probably sell yours to somebody.They're not bad heads.They just ain't gonna support 400 HP as is.
Joker, I appreciate all your assistance. Can you give me some guidance as to intake runner size, 185, 195, 210?? Chamber CC, 64 70??
I'm looking at these:
Brodix 1021007 Brodix IK180 / IK200 Small Block Chevy Cylinder Heads

or these:
http://www.summitracing.com/search/b...s?autoview=SKU

I understand that the Pro-Filer heads:
SBC 23 Degree Cylinder Heads
are very good but, according to another post on here, there is a substantial backlog on getting them.

Would any hyd. roller cam of between 220 and 250 deg. be enough to get me close to 400 HP with stock intake and injectors?

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  #17 (permalink)  
Old 09-04-2013, 04:35 PM
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Originally Posted by F-BIRD'88 View Post
I don;t know It depends on how much power you want to make. I don;t pay other people to port "re work" cylinder heads. I do it my self. Whether its best for you to port your LT1 heads or get and port a set of the LT4 heads or go aftermarket depends on what you are after and what you are willing to do.
Yea, I understand what your saying. I really don't think that I have the ability, tools and or time, to clean up and port my own heads. I really wish that I did, it would make life much easier. From what I've read, on this forum and publications, a stock lower end can support 400 HP and your money ahead investing in a good set of heads with a cam to match. Would cleaning up and some porting on my stock intake manifold yield any additional benefits?
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Old 09-04-2013, 05:22 PM
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You will need a Gen2 head for either LT1 or LT4.I would use the smallest chamber volume I could get as close to your stock size.Even a 64cc chamber is gonna give up some compression.Your stock heads were 58cc.Camshaft selection is gonna be critical to not lose even more compression due to larger cams with late IVC points bleeding cylinder psi off.As far as port size,IMO,the 195cc would be good.You currently have 185cc intake ports.I'd rather have a 2nd opinion on that that tho to confirm.I'm not completely up to par on benefits & effects of the different port sizes & how they apply.Choose your head 1st,so you know what your SCR will be,then choose a camshaft with specs that will provide you with the proper timing events,specs,to your particular combo that will provide you with an optimum DCR.
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Old 09-04-2013, 05:55 PM
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While shopping & comparing heads & flow rates each 1,don't get hung up on maximum advertised flow.Some heads advertise the max flow @ high lifts.Compare flow across the board @ low lift,mid lift.If a heads best flow is only achieved @ max lift,that's the only time you will see the benefits.Your cam spends most of it's time @ low to mid lifts.You want a head that has good flow across the entire lift.Not just @ max lift.
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Old 09-04-2013, 07:32 PM
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Your intake is a dry flow.it doesn't convey air & fuel as a carb setup.Even so,cleaning up any casting flash,mismatch,or,irregularites is always a good thing.
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Old 09-05-2013, 10:16 AM
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Quote:
Originally Posted by jokerZ71 View Post
While shopping & comparing heads & flow rates each 1,don't get hung up on maximum advertised flow.Some heads advertise the max flow @ high lifts.Compare flow across the board @ low lift,mid lift.If a heads best flow is only achieved @ max lift,that's the only time you will see the benefits.Your cam spends most of it's time @ low to mid lifts.You want a head that has good flow across the entire lift.Not just @ max lift.
For all intents and purposes, if I stick to Brodix, Edelbrock or Pro-Filer, shouldn't I be OK?

I'm looking at these heads from Pro-Filer:
SBC 23 Degree Cylinder Head, 11/32 Guides & Steel Seats
Intake Port Size: 195cc Intake Ports
Chamber Size: 70cc As Cast Chamber
Spark Plug Orientation: Angle Plug
Intake Valves: 2.02/1.600 Valves
Spring Package: Opt 92 .550 Lift,1.250 Single Springs, AL Retainers, Keepers Assembled ADD $50
Casting Style: Standard Cooling

Any thoughts?
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Old 09-05-2013, 10:34 AM
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You cannot use a standard GEN I style head on a Gen II motor (LT1, LT4)
and the chamber is too big unless you will be supercharging it.
AFR makes a good Gen II head for this motor. Hi port heads need the LT4 intake
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  #23 (permalink)  
Old 09-05-2013, 02:42 PM
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Originally Posted by F-BIRD'88 View Post
You cannot use a standard GEN I style head on a Gen II motor (LT1, LT4)
and the chamber is too big unless you will be supercharging it.
AFR makes a good Gen II head for this motor. Hi port heads need the LT4 intake
Yea, I undestand that 92-97 LT1 is different. What size chambers should I be looking for? Something close to to 56 CC?
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Old 09-05-2013, 04:44 PM
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You have 54cc on your stock head.You wanna stay close to that to keep from losing compression.The E'brock Performers have 54cc & 170cc intake port vs your stock 185cc.They flow 242 cfm @ .500 lift.Lower lift #'s are ok.You also have Dart Pro 1's, AFR's.IDK what your budget is for heads.The E'brocks will support your 400HP goal,but,that would be about all.Most aftermarket LT1/LT4 heads have 54 to 58 cc chambers.IDK how the 170cc intake ports vs your stock 185cc would effect things.F'bird can maybe explain that better than I can.

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  #25 (permalink)  
Old 09-05-2013, 08:45 PM
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This Trick Flow head looks like to me it would be a good candidate. #TFS30410008-M54. $1500. Not bad for a CNC chamber head. The TFS-30410010 is also good except it has 62cc chambers & since your already an extra .020 in the hole,you will lose some CR. $1460.
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  #26 (permalink)  
Old 09-05-2013, 09:01 PM
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For 400hp stock lt1 heads will work fine though a little port work can help.
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Old 09-05-2013, 09:11 PM
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I wasn't sure if they would or not.I was basing on the fact that Vortecs flow 230Ish & are spose to support 400.The stock LT1's flow around 212.I thought they may fall a little short.
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Old 09-05-2013, 09:15 PM
How fast is fast enough?
 
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With a good valve job and a little porting they will do quite well.
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Old 09-06-2013, 05:11 AM
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I wasn't sure if they would or not.I was basing on the fact that Vortecs flow 230Ish & are spose to support 400.The stock LT1's flow around 212.I thought they may fall a little short.
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With a good valve job and a little porting they will do quite well.
OK---you guys got me considering using my stock heads. SO..... the engine had 170,000 hard miles on it. The owner really didn't believe in preventive maintenance ie. oil changes etc. I don't have the skills, or equipment, to do my own head work. If my heads need EVERYTHING, plus the performance work, angle valve job, porting etc., is buying new heads a better option or just get the old heads done? Any limitations on my cam selection by using my old heads?
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  #30 (permalink)  
Old 09-06-2013, 05:49 AM
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No limits on the cam. I'd send them to headbytes to get them redone, best value for the money.

Headbytes.com

You can try local too but I don't know what the prices will be.
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