LS1TECH - Camaro and Firebird Forum Discussion

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-   Generation III Internal Engine (https://ls1tech.com/forums/generation-iii-internal-engine-5/)
-   -   400+ CID with 243's? (https://ls1tech.com/forums/generation-iii-internal-engine/1798464-400-cid-243s.html)

JWStevens Aug 15, 2015 12:46 AM

400+ CID with 243's?
 
I'm considering buying a 400+ inch short block but I've got a nice set of ported 243's. Has anybody done this and had good results? Its my daily but I still want it to be fast.

kinglt-1 Aug 15, 2015 01:38 AM

Yes there are a few threads in the dyno section of 418" strokers making 550whp with a quality 243 head and fast intake.

01ssreda4 Aug 15, 2015 07:59 AM

Yep, I believe it can be done successfully. It may not be 100% optimal for an all out NA engine but should be a very nice driver.

HCI2000SS Aug 15, 2015 08:32 AM

If it's truly your "daily driver" I'd by a beater first lol

JakeFusion Aug 15, 2015 10:24 AM

The TEA Stage 3s made 600rwhp back in 2005 on a 440.

They are lousy heads, obviously.

redtan Aug 15, 2015 10:51 AM

Ported nicely and big enough valve they can be made to flow 330+ cfm which is going to be pretty good even for a 402 size stroker. Velocity might suffer down low, but with a stroker and decent compression you'll make plenty of torque down low to make up for that.

sbf Aug 16, 2015 08:05 AM


Originally Posted by redtan (Post 18927881)
Ported nicely and big enough valve they can be made to flow 330+ cfm which is going to be pretty good even for a 402 size stroker. Velocity might suffer down low, but with a stroker and decent compression you'll make plenty of torque down low to make up for that.

like stated above its a few have used the 243 heads and made alot of power i plan on using my tea 243s on a 418

Jimbo1367 Aug 16, 2015 11:30 AM

I never knew TEA had a stg III 243s. What does this consist of?

redtan Aug 16, 2015 12:30 PM

Think they just have bigger valves, 2.08 and 1.60. The porting is usually the same.

SS69LS1 Aug 16, 2015 12:36 PM

I'm running texas speed 243s w bigger valves on a 402, 11.5 comp, fast 102, 235/242 111 and it made 537 to tires.

redgto4u Aug 16, 2015 12:38 PM

I'm running ai 243 heads on my 418. They perform very well imo. Sure I could of put some really nice afr 245's or even a set of ls3 heads on it. I had these heads already and had to stop somewhere!

01ssreda4 Aug 16, 2015 05:35 PM


Originally Posted by redgto4u (Post 18929154)
I'm running ai 243 heads on my 418. They perform very well imo. Sure I could of put some really nice afr 245's or even a set of ls3 heads on it. I had these heads already and had to stop somewhere!

No shit. Budgets get blown out of the water just trying to make a quick and fun street car.

JWStevens Aug 20, 2015 10:05 PM

Yeah, its really my daily. I've got a truck though. That's what I needed to know guys. Thanks a lot for the feedback!


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