853 vs 243 heads

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May 23, 2012 | 08:21 PM

Roarin_8

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From: Kissimmee, FL

853 vs 243 heads

Gonna have to change lifters soon and may catch a break on getting a set of 243 heads for cheap also. Anyone know if there's a power difference between the 2?

May 23, 2012 | 08:24 PM

Z28SteveA4

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there a huge difference right off the bat if compared stock to stock. Your prob looking at 20hp with the 243's over the 853s the way they sit. I hope if your doing all that work that a cam is in the mix too.

May 23, 2012 | 08:27 PM

Roarin_8

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Cam is already in the car, just gotta change the lifters since one of them on the passenger side is ticking slightly

May 23, 2012 | 08:29 PM

garygnu

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if the heads are coming off get a nice cam pkg to compliment the heads.a tsp 224r will put you in the 11s.

May 23, 2012 | 08:34 PM

Roarin_8

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lol car already has an aftermarket cam in it. 234/238 .595 .602 on a 112 Car has the MPH for 11s but the 2.73s are holding it back.

May 23, 2012 | 08:39 PM

z28241

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Quote:

Originally Posted by Roarin_8

Gonna have to change lifters soon and may catch a break on getting a set of 243 heads for cheap also. Anyone know if there's a power difference between the 2?

U have been a member how long with 3k plus posts..and ask that?

May 23, 2012 | 08:49 PM

Roarin_8

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Quote:

Originally Posted by z28241

U have been a member how long with 3k plus posts..and ask that?

lol Didn't know the exact power number, maybe I asked the question wrong, always seen dyno sheets with 243 heads posting good numbers but rarely see the 853s, maybe there's a reason behind it........

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May 23, 2012 | 08:57 PM

SWEET98SS

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See my sig for CNC ported 853's, basically ebay headers and a BBK intake and TB.

May 23, 2012 | 08:57 PM

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badazz81z28

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Quote:

Originally Posted by Roarin_8

lol Didn't know the exact power number, maybe I asked the question wrong, always seen dyno sheets with 243 heads posting good numbers but rarely see the 853s, maybe there's a reason behind it........

Yea, because the 853 heads are the worst flowing out of the bunch. The 243 head discussion comes up everyday. One day as a member on this forum and you will see a dozen post on 243 heads.

For the 346 Ci Ls1/Ls6, the 243s are the best stock casting available.

May 23, 2012 | 09:00 PM

#11

Roarin_8

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Was never in the market for heads since I wanted to build up the trans first. But I can't pass on this deal for these heads. Like I said before, I always saw them as posted with dyno numbers but was never able to compare them to the 853 heads. And I never bothered since I wasn't going to change the heads anytime soon. But now.......

May 23, 2012 | 09:10 PM

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chaman

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Quote:

Originally Posted by SWEET98SS

See my sig for CNC ported 853's, basically ebay headers and a BBK intake and TB.

Did you perform the 853 heads work yourself? I basically have the same setup as you.

May 23, 2012 | 09:16 PM

#13

badazz81z28

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Quote:

Originally Posted by chaman

Did you perform the 853 heads work yourself? I basically have the same setup as you.

Signature show AI worked them. Good numbers.

May 23, 2012 | 09:19 PM

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chaman

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I see. What AI stands for? Sponsor here?

May 23, 2012 | 09:29 PM

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badazz81z28

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Quote:

Originally Posted by chaman

I see. What AI stands for? Sponsor here?

Advanced Induction. For around $1000-$1200 they CNC port them for you.

May 24, 2012 | 09:34 PM

#16

SWEET98SS

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Cam, CNC port heads, pushrods, new springs, seals, locks and retainers. It was right around $2000. I know there is some power left on the table with my headers and intake but i wasnt looking for all out power, its a street car right now.