Has anyone tried these or have any first hand knowledge of them? I'm thinking about buying them for my ls2 and then putting a heartbeat sc on it. It says the are better for ls2 because of less shrouding. https://www.jegs.com/i/Edelbrock/350/61319/10002/-1

 

I'm sure they would work fine. You'd need to mill them a little and use a thinner head gasket to keep your static compression ratio up there. There's absolutely no advantage to settling for a lower CR. By the time you pay someone to mill the heads, you're going to have $3K tied up in them.

Or you could find a used set of LS3 heads, send them to TX Speed for their CNC port work, CNC valve job, milling to your spec, cleaning, and assembly with your valve spring of choice. They do that for 800 bucks. You get a good as new set of heads back that are very capable for less than half the money of the Edelbrock heads.

With a small blower cam under a Heartbeat blower, there's really no advantage to the smaller high velocity ports. They sound good, but the velocity and low speed torque will be plenty high as long as you don't over cam it. Keep the cam around 220* on the intake and 234ish* on the exhaust with a 115 or 116lsa. Full boost available just past idle RPM will cure any low RPM ills.

I'm using the Tx Speed CNC'd LS3 heads on my naturally aspirated LS3. With a 226/234 115lsa cam, it's a torquey ****. Internet lore would tell you that "Hogged out" LS3 heads are a dog under 5000 rpm. That just isn't the case. If rectangle port heads were all that bad down low, I'm guessing GM wouldn't use them on pickup truck engines.

 

Cam Motion .LS Supercharger Camshaft for Positive Displacement

Duration: . 220° / 234°

Lift: . .. . ...595" / .587"

LSA: . ... . .118° .(with 4° Advance)

Overlap: -.-9°

https://cammotion.com/camshafts/pd-2...-displacement/

 

That would work just fine. That cam on a 116+2 lsa would be good too. I'd get it ground with .610 lift on both sides though. LS3 heads milled .010 with a .040 head gasket would get the static CR back up to 10.9:1. It wouldn't be lethargic out of boost like some high LSA blower cams tend to be. Equipped this way with an 84mm blower pulley would easily get the OP into the mid 600 rwhp range on less than 10psi of boost.

 

Thank you for the responses. I think I'm going to take your advice and go the Texas speed or go with Livernois ls3 heads small blower cam route.

 

I don't think there's any better blower solution than the Heartbeat for a street ride. Sure, you can make more power with bigger blowers (that's a shocker, isn't it?). Mid 600's at the wheels with stupid big torque available just past idle makes for one FINE ASSED street ride. I've owned three TVS2300's. The last one was a Heartbeat TVS2300. Yeah, it costs more. Yeah, it wouldn't be my choice if chasing huge numbers. On top of a stock bottom end LS engine used on the street, it's hard to beat.