Does anyone know about these heads?

P/N EDL61969

I have recently been made aware of these heads from Edelbrock. I'd like to do a H/C in the future. They sound like a good product. I've already looked at the Edelbrock webpage. Their posted flow numbers look good. I have made enquiries on other forums. But there wasn't much feedback. Now I see that Lingenfelter has their heads as their own CNC'd heads. Flow numbers look good. But again there doesn't seem to be much discussion on the LS1 forums. I'm wondering if these heads are associated with Lingenfelter. Also, perhaps Edelbrock provides the castings and Lingenfelter does the CNC then the heads become a Lingenfelter product? What's the story?

Is anybody running these heads? Does someone have some feedback? Any tuner or speed shop feedback?

Thanks in advance.

 

Nah. I'd only use tried and true stuff.

Ported LS6 heads or a couple aftermarket heads like Dart 205cc/225cc or Trickflow 215cc heads.

As far as those Edelbrock heads go, they show that they are 202cc, which makes me wonder how much they were actually massaged. Stock is 200cc. I wouldn't do it.

Heads/Cam I'd do a set of ported LS6s from AI or Larry Meaux with a Futral F13 or F14 or for aftermarket (if money isn't an issue) the Trickflows (or Darts for less $$) with a Futral F13 or F14.

Mike

 

Thanks for the feedback. I live in Kalifornia, home of the Smog *****. So I like this product for it's CARB EO #. I know about AFRs (which are 205s) but my opinionated tuner does like AFR (I know ) But he knows his stuff in a land with a lot of knowledgible tuners.

I could go with some ported LS6 heads. But actually the smaller runners help with the low end torque. I am worried that the ported runners of an LS6 head will widen them and slow down the airflow. I need to do more research.

Again I appreciate your input. I haven't been getting much info about these heads.

 

If you're in Cali, then I'd definitely get some ported LS6 heads. Those are "factory" heads and won't bring up any issues during an inspection. Check out AI www.advancedinduction.com or Larry Meaux (I'd check out AI first.. Larry Meaux is much more race-oriented and you'll be waiting 6-10 months for a set of heads)

"Low-end torque" on an LS1? Haha. These motors are detuned race motors. Peak torque on a stock motor is over 4000 rpm.

 

Agreed.

 

Port size has little to do with low end torque. Even less so when talking about a 10-20cc runner difference.

Edelbrock has always made quality products. That's their trademark. Another one of their trademarks is that their product underperforms when comparing to others in the market. I am NOT a head porter by any means, but the raw castings I saw on the Edelbrock truck at an NHRA event years ago looked very poor. True, they were raw castings, but I've seen AFR raw castings too

 

Back again...

My vette is in the shop getting heads and cam installed. The heads are Precision Race Components (PRC) LS6 heads (799s), of course they are ported and polished. They have been milled to give me 10.9:1 compression with double spring valve springs. The cam is a custom grind with my tuner's specs; 226/230 0.585/0.585 LSA 114. The rockers are being upgraded with trunion bearings, with new lifters, and pushrods. Car should be ready this week. Dyno tuning is part of the package, I'll let you know hte results later this week.

 

I'm going to go out on a limb and guess 430-440rwhp.

 

SShhhhhh.

It's what I'm hoping for. But every time I hope it comes up short (internet fed optimism ). So I'll just wait until I get the numbers. Give you the full story soon.

 

Put it this way.. I made 471rwhp on a heads/cam/intake swap. You can expect to be a little lower due to the smaller cam and the lack of a FAST 90/90 intake setup.

 

I think your estimates are definitely in the ball park. The actual figures will seem low. My tuner has a very stingy dyno, even miserly. With all the mods in my sig, I produced 323 rwhp on his dyno. A few weeks later I went to another tuners dyno day and did 352 rwhp. The gap will get bigger with more power.

I would have gone with a 90/90 FAST but I've heard that they only produce a 20 rwhp gain over a LS6 manifold. The cost is just too high for the gains involved. And, my tuner port matched my manifold and he found a higher than usual number of irregularities which he eliminated. The port matching should make some gains even if they are small. I should have more than enough power for my needs.

 

330-40rwhp sounds about right for those bolt-on mods. The Corvette IRS eats a few more percent than the F-body.

What kind of dyno does he have? Dynojet? Mustang? Dynapack?

20rwhp is NOTHING to sneeze at

 

He has what is called a Mainline Dyno from Australia. So basically we are converting Kw to Hp. Another theory is that his horse are Clydesdales. As opposed to the more common shetland ponies other dynos use.

As it turns out he ported the LS6 manifold. A FAST intake would have been a nice addition to the mods. But at nearly $50/HP it was just too much at this time. Besides I beginning to worry that I may end up with too much output. With the numbers I'm looking out, a new clutch and radiator may be in my future? He's going to tune it this morning (maybe even at this minute). I'm am anxiously waiting for the end of the day.

 

You didn't upgrade the clutch? Baha. Time for another $400 + $500 labor.

Upgraded Radiator? Not needed.

 

My tuner installed a base tune. It idles okay, with an excellent lope. On start up the idle drops to 500 rpms then goes back to 700 - 800 rpms. He wants me to drive it around for 200 miles and let the new valvetrain break in. He didn't want to go WOT on the dyno with newly installed push rods, lifters, and rockers. It surges a little under 15 mph. Above that it is all good. Even at 3/4 throttle it goes to 90 mph like it was nothing. On a moderate San Diego evening of 80 something, the coolant temperature stayed in the 190's.

I don't push my clutch too hard. Hopefully it will last awhile.

Radiator upgrade won't be needed? I usually do canyon carving. The August monthly run is usually the hotest of the year. We'll probably know then.