6.2 with 243 head
Thread Starter
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
6.2 with 243 head
Looking at picking up a forged 408-416-429 ls9/ls3 block will my 243 heads and stock exhaust manifolds, steam pipes , s/c and all that hook up well? Having it built 24x to make it easier.
How much power would be the return on this ? Got a decent deal it’s brand new just wondering before I go spending another 3500 on it! Built to hold over 1200hp!
How much power would be the return on this ? Got a decent deal it’s brand new just wondering before I go spending another 3500 on it! Built to hold over 1200hp!
Instructor
Joined: May 2010
Posts: 243
Likes: 53
From: Draper UT
Looking at picking up a forged 408-416-429 ls9/ls3 block will my 243 heads and stock exhaust manifolds, steam pipes , s/c and all that hook up well? Having it built 24x to make it easier.
How much power would be the return on this ? Got a decent deal it’s brand new just wondering before I go spending another 3500 on it! Built to hold over 1200hp!
How much power would be the return on this ? Got a decent deal it’s brand new just wondering before I go spending another 3500 on it! Built to hold over 1200hp!
The LS3 manifolds are larger inside than the LS1/6 ones. You could probably save some $ and gain horsepower with a set of shorty headers that bolt to the rest of your exhaust system. I’d also get a new 4 corner steam venting kit.
No no idea on power, not enough info.
Instructor
Joined: Jan 2006
Posts: 248
Likes: 14
From: Mesa
It will all bolt up just fine. Although I would never have stock exhaust manifolds on a supercharged stroker engine.
I ran cathedral 317 heads on a forged ls3 shortblock and made 800rwhp through a th400.
I ran cathedral 317 heads on a forged ls3 shortblock and made 800rwhp through a th400.
Safety Car
Joined: Mar 2017
Posts: 3,767
Likes: 938
From: Orlando Florida
Well for the love of octane please continue to update this thread and let us know which way you decide to go and how it turns out. I've had some similar, though less courageous thoughts, in particular the 6.2 bottom with a 24X wheel and 243 heads/intake.
Drifting
Joined: Sep 2017
Posts: 1,959
Likes: 691
From: Avon Lake OH
May want to read through here on the OEM head, just for some reference on the 243 vs. 317 heads on any short block larger than 6.0 especially if you plan to go the boasted route. Personally I would think the smaller chamber 243 head may not be the best bet if you plan a lot (say over 5-6 PSI) of boost pressure. Best bet would be the LS3 type intake and heads, but if you already have the caterdral port parts, I can understand why you may want to keep them. BTW, you will need to put LT headers on that s/c engine, just no two ways about it or you will choke you setup for sure if you are going to run anything over again say over 5-6 PSI of boot, especially with that large of a short block.
https://www.lsenginediy.com/ultimate...r-heads-guide/
https://www.lsenginediy.com/ultimate...r-heads-guide/
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Thread Starter
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
Awesome was great to look at those charts. Have to stick with the cathedral port heads and intake. I will prob just shove some high flow cats on and change the mufflers over to a slp style. Stock manifolds look they will hold up with a little porting-cleaning . With long tube headers my thoughts is you will gain air flow but loose back pressure. Losing the low end towards mid range. Maybe these take a huge toll on your rings as well. The 243 heads with the ls9 bottom end should gain a small increase in compression support a more low end mid range responses. Also I don’t track and live in Cali no headers trying to keep it legit as possible. I got a different air plenum also I plan on adding. Maybe shorty headers legal if I ever get around wanting to afford them.
Drifting
Joined: Sep 2017
Posts: 1,959
Likes: 691
From: Avon Lake OH
Awesome was great to look at those charts. Have to stick with the cathedral port heads and intake. I will prob just shove some high flow cats on and change the mufflers over to a slp style. Stock manifolds look they will hold up with a little porting-cleaning . With long tube headers my thoughts is you will gain air flow but loose back pressure. Losing the low end towards mid range. Maybe these take a huge toll on your rings as well. The 243 heads with the ls9 bottom end should gain a small increase in compression support a more low end mid range responses. Also I don’t track and live in Cali no headers trying to keep it legit as possible. I got a different air plenum also I plan on adding. Maybe shorty headers legal if I ever get around wanting to afford them.
Thread Starter
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
I believe it should not be of an issue as long as the parts are from a 1 year or newer corvette it’s all carb legit. At least that’s my knowledge of it. I was thinking on using some ls9 ZR1’s or my ported stockers. Either way it should make no difference on emissions testing. There direct replacements hahaha.