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  #76 (permalink)  
Old 04-29-2014, 05:47 AM
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Originally Posted by ericnova72 View Post
If you were pulling away on a CTS-V, that would put you in the mid low 8's in the 1/8th, maybe able to crack into the high 7's.

I didn't realize you had a decent converter when I made my first high 8's estimate on 1/8 mile a page ago.
im hoping for mid to low 8 on muscle and then wack it with a 175 or 200 but i need my wide band and all them goodies before. also the comp springs! that way i know i wont valve float. but am happy. im looking for some one to lend me some slicks so i can try the truck out at the 1/8.. my ta went 7.20 on motor 3500 WITH ME IN IN 260LB 6.60 with a 150 was going to up jet it to a 225 but sold the car for this truck..

stall is a 3800 fti but its a dam tight converter feels tight around town so im good...

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  #77 (permalink)  
Old 04-29-2014, 05:50 AM
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ok guys some more questions! multiple people have told me the aluminum heads are not worth fixing NOW. the same guy is offering me a set of 990s over the 049s they are ready to bolt up what do you guys think??? 700 bucks for them.
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Old 04-29-2014, 02:14 PM
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Originally Posted by ss454lemy View Post
ok guys some more questions! multiple people have told me the aluminum heads are not worth fixing NOW. the same guy is offering me a set of 990s over the 049s they are ready to bolt up what do you guys think??? 700 bucks for them.
990's are the factory Rectangle port heads...which means you will need a different intake...and they aren't going to be a good match for you unless you set make a big change-up with 11-1 or more compression, and the crank, rods, pistons and cam/valvetrain to run a 4500-7500+ rpm range.

I would say pass on the heads, as they are factory and will need a good amount of porting just to run with aftermarket 290 cc or bigger ovals. The 990's are old stone age dinosaur design and tech from 1965 basically, that particular casting # was used on the 450 hp 454 LS-6 1970 Chevelle solid lifter cam engine, and as the over-the-counter performance replacement in the 1970's. Has 118cc or bigger combustion chambers.

454 with these heads can make good power, but you got to rev it WAY up to get it.
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  #79 (permalink)  
Old 04-30-2014, 04:46 AM
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990's are the factory Rectangle port heads...which means you will need a different intake...and they aren't going to be a good match for you unless you set make a big change-up with 11-1 or more compression, and the crank, rods, pistons and cam/valvetrain to run a 4500-7500+ rpm range.

I would say pass on the heads, as they are factory and will need a good amount of porting just to run with aftermarket 290 cc or bigger ovals. The 990's are old stone age dinosaur design and tech from 1965 basically, that particular casting # was used on the 450 hp 454 LS-6 1970 Chevelle solid lifter cam engine, and as the over-the-counter performance replacement in the 1970's. Has 118cc or bigger combustion chambers.

454 with these heads can make good power, but you got to rev it WAY up to get it.
i had only considered these cuz my buddy told me they where closed chambers @100cc or less but if there open chamber 119 cc for that i stay with mine.

to make my 049s descent i would need to do the bigger valves and bowl work correct?
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Old 04-30-2014, 12:08 PM
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Originally Posted by ss454lemy View Post
ok guys some more questions! multiple people have told me the aluminum heads are not worth fixing NOW. the same guy is offering me a set of 990s over the 049s they are ready to bolt up what do you guys think??? 700 bucks for them.
. Are these 'multiple people' local people who have actually seen/examined those heads... or just guessers on line?

. Yes, rectangle ports are a double whammy... ports too big for anything but an all out 9,000 RPMs race engine... but too poorly shaped to flow much...

. Your current heads just need more compression ratio (pistons) for naturally aspirated use... however, fine as is for if/when you get around to adding a power adder...
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  #81 (permalink)  
Old 04-30-2014, 04:51 PM
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Originally Posted by ss454lemy View Post

to make my 049s descent i would need to do the bigger valves and bowl work correct?
Yes, that's correct. You could use all the parts from the Aluminum 502 heads you bought what had no good castings if the parts are in good shape.
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Old 05-01-2014, 05:06 AM
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. Are these 'multiple people' local people who have actually seen/examined those heads... or just guessers on line?

. Yes, rectangle ports are a double whammy... ports too big for anything but an all out 9,000 RPMs race engine... but too poorly shaped to flow much...

. Your current heads just need more compression ratio (pistons) for naturally aspirated use... however, fine as is for if/when you get around to adding a power adder...
the power adder ill be using is nitrous witch loves compression, so that not a big deal. im going to have to put new pistons in this thing. something i been trying to avoid... what the highest compression i can run on pump gas? a buddy of mine was telling me i can run high compression on pump gas with the timing backed up and i can bum up the timing when i put race gas in it.

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Originally Posted by ericnova72 View Post
Yes, that's correct. You could use all the parts from the Aluminum 502 heads you bought what had no good castings if the parts are in good shape.
parts on the head look good i haven't taken the heads apart yet to see how the valves look on it. but on the combustion chamber side they look pretty clean. im going to try to fix my the aluminum ones with epoxi. either way it's on the exhaust port if anything happens it will just be water coming out of the exhaust no biggie. i really want to fix them aluminum heads every one keep telling there good but then again not worth fixing. so on a low budget back yard custom (me) is going to fix worst come to worst i build the 049...
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  #83 (permalink)  
Old 05-01-2014, 08:50 AM
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you can weld aluminum,,,
why not post pictures of all these parts you have so we can point at the good parts and see the damages?
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  #84 (permalink)  
Old 05-01-2014, 09:49 AM
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you can weld aluminum,,,
why not post pictures of all these parts you have so we can point at the good parts and see the damages?
will do i don't have any at the moment but i will get some tonight and post them up...
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Old 05-06-2014, 01:39 PM
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. Yes, find the right race shop and they should be able to weld up your aluminum heads at a decent price...
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  #86 (permalink)  
Old 05-08-2014, 04:59 AM
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well guys i haven't done much. im in the process of building an ls motor for a buddy. but i did find some one that is an experienced welder that told me he'd do the heads for me so we will see!!!
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  #87 (permalink)  
Old 05-09-2014, 10:25 AM
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. Yeah, hard to pass up some great heads when they fall in your lap...
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Old 05-09-2014, 10:27 AM
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well found some one that swilling to take the challenge and weld up the heads. he said that my heads cant be as bad as hi big cheaf heads. so we will see im hoping i can save them!!! that a good amount of hp gain here.
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Old 05-13-2014, 07:20 PM
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Hey guys there offering me a set of 188s what do you guys think aren't theses closed chambered and will give me more compression I haven't had time to take the heads to the guy that's going to weld them up for me
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Old 05-13-2014, 07:45 PM
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Nope, 188's are open chamber 118cc+, were used as over-the-counter replacement Rect Port heads, and on mid-70's and later High-Po crate engines, and 1987-96 Performance crate engines. The 990's are considered just a bit better.

Closed chambered Rectangle Port heads will end with #'s 291 or 292 (108cc), even more closed is #840 (106cc, but only 1.72" exhaust valve). There are a few other numbers as well, you'd have to look them up.
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