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Aftermarket heads vs 243 heads

This is a discussion on Aftermarket heads vs 243 heads within the Internal Engine forums, part of the LSx Technical Help Section category; Question i've got is whether to spend the money on porting my 243 heads or go aftermarket, full bolt ons ...

  1. #1
    Junior Member sloroller's Avatar
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    Aftermarket heads vs 243 heads

    Question i've got is whether to spend the money on porting my 243 heads or go aftermarket, full bolt ons custom grind cam 600plus lift 4000 stall any suggestions?

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    408 ci + 4000 stall = fun lancesT/A's Avatar
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    porting your heads would prolly be the best bang for buck i know you can buy a set of 243's ported for 1300 but i know youll see atleast a 20hp gain thru the rpms with a set of AFRs or TFs versus ported 243's but then again youll spend 2400-2700 on those heads

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    Junior Member sloroller's Avatar
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    Do you have any ideas on where and how much it might cost to do the head work?

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    408 ci + 4000 stall = fun lancesT/A's Avatar
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    idk prolly atleast 600 bucks as far as where look around for local performance shops they might be able to point you in the direction of a good machine shop to do the porting i know of some good ones in texas but ive never even been to Alabama is it?

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    Junior Member sloroller's Avatar
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    Thats right alabama trying to get 400rwhp on the ls6 motor hope to see the dyno soon to get at least a baseline to go by.

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    408 ci + 4000 stall = fun lancesT/A's Avatar
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    Quote Originally Posted by sloroller View Post
    Thats right alabama trying to get 400rwhp on the ls6 motor hope to see the dyno soon to get at least a baseline to go by.

    after the heads you should be around 400 your gonna lose some bc of the stall but you ETs will be better
    501rwhp, 538 rwtq thru an A4 and a 4000 stall (n/a) not to shabby i say

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    Junior Member sloroller's Avatar
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    what kind of times you running thru the eighth and quarter, 60ft ? 11.20s 7.20s 1.4 60ft trying to reach 10's on motor dont know if that will happen.

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    408 ci + 4000 stall = fun lancesT/A's Avatar
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    i just finished my 408 2 weeks ago and havent been to the track yet all i have around me is an 1/8 mile to have realistic i think il run mid to low 7s in the 1/8 maybe lower who knows in the quarter prolly low 11s

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    Junior Member sloroller's Avatar
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    i dont know if the air levels are the same in abilene texas but if the same as north alabama that should be easy to do. Im using the 4l60e tranny with the circle d 4000 stall 4.10 gears good luck when you go to the track.

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    408 ci + 4000 stall = fun lancesT/A's Avatar
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    elevation here is like 1800ft id like to get in the 10s when i run the quarter i also have 4.10 gears and an ss4000 stall do you have any times on yours yet??

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    Quote Originally Posted by lancesT/A View Post
    elevation here is like 1800ft id like to get in the 10s when i run the quarter i also have 4.10 gears and an ss4000 stall do you have any times on yours yet??

    1800', thats on a really really good day... the first month or so that the track is open it ranges from 1500-2700'. All throughout summer it likes to hang around 3000-3800' range. Then around the middle of fall or so, it starts to dip back down in the 2000' range. But you should definately be in the low 7s, 6s are possible but usually not likely here all motor unless you have put the car on a diet...

    To the OP: With a nice cam and full bolt ons (if that includes an intake like a FAST) you should be right around the 400 mark without head work, but every little bit helps. H/C/I should easily see 400. I've seen cam only stalled autos hit anywhere between 350-388 RWHP, with no real supporting mods except Longtubes.

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    Quote Originally Posted by lancesT/A View Post
    porting your heads would prolly be the best bang for buck i know you can buy a set of 243's ported for 1300 but i know youll see atleast a 20hp gain thru the rpms with a set of AFRs or TFs versus ported 243's but then again youll spend 2400-2700 on those heads
    I got brand new ported and polished 243's fully assembled (with stock parts) for 750. gotta love eBay!

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    Junior Member sloroller's Avatar
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    yeah forgot got a fast 92 intake big mouth 92 tb and went 11.28 @119 quarter time eighth mile running usually 7.20s @ 98-99 just depend on track prep

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    408 ci + 4000 stall = fun lancesT/A's Avatar
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    Quote Originally Posted by TACE02 View Post
    1800', thats on a really really good day... the first month or so that the track is open it ranges from 1500-2700'. All throughout summer it likes to hang around 3000-3800' range. Then around the middle of fall or so, it starts to dip back down in the 2000' range. But you should definately be in the low 7s, 6s are possible but usually not likely here all motor unless you have put the car on a diet...

    To the OP: With a nice cam and full bolt ons (if that includes an intake like a FAST) you should be right around the 400 mark without head work, but every little bit helps. H/C/I should easily see 400. I've seen cam only stalled autos hit anywhere between 350-388 RWHP, with no real supporting mods except Longtubes.
    u live in abilene i was driving mine around yesterday and saw a collectors edition at gandys dont know if you live here or not

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    Quote Originally Posted by sloroller View Post
    yeah forgot got a fast 92 intake big mouth 92 tb and went 11.28 @119 quarter time eighth mile running usually 7.20s @ 98-99 just depend on track prep
    your sittin at what right now? i have stock 243's, cam LS1 intake and stock throttle body and im at 400whp...

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    Junior Member sloroller's Avatar
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    I dont know hp right now im guessing 400 or high 380 full bolt ons, cam ,tb lts, stall 4l60e, fast 92 intake

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    Member devildogws6's Avatar
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    ahhh gotcha...yeah 243's flow nice i would of gotten mine cnc'd but didnt have the cash so im gonna port them in class here in about a month or so....so i say just port and polish these no need to spend all that extra money unless you really need or want that extra 20hp if you get that, but thats my opinion. but those are some pretty intense times lol then you can put the money you save into suspension parts


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    Quote Originally Posted by lancesT/A View Post
    u live in abilene i was driving mine around yesterday and saw a collectors edition at gandys dont know if you live here or not


    Yep, thats me...lol.

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    you can get trick flows 220cc cast heads for $1700 from most vendors here.the 243s will make 400rwhp with a 228r cam ,unported.

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    Junior Member sloroller's Avatar
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    yeah i'm thinking just leave the heads stock because you proably cant notice the extra 20 hp.And for suspension i think i have enough ,qa's on all four corners lower control arms panhard bar trans brace bigger sway bars. I guess i could take the money for the headsand get a 150 shot NOS. dreaminnnnnn lol.

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