Double06

Anyone tried these on a street motor in the 600-700 flywheel hp range - naturally asperated. You know like a lot of the NA motors I see guys doing here 416-454 ci, 12 to 1 compression, cam 240-250 duration at .050, headers, intake etc. A lot of the stuff I see is on 1000 hp engines. Some interesting features on the heads just not sure what it translates to a motor in the range I am talking about.

Smokey B

Shouldn't be a problem ......with what your asking. Long ago ported Factory heads were making 600 rwhp....and still do....These have better features. 1 thing u need to find out is the P/V clearances as the heads your talking about has a 10 degree valve angle Vs standard 12 degree Ls7 heads. What you listed in terms of cam, compression, etc is on point.

larsieboy

I think he means. Do these heads also work under the curve. Or will it be a lazy dog in low revs.

Smokey B

Thing is just cam it smaller...yeah it's that Damn simple. For 700 fwhp those heads R a little over Kill.

Double06

Yes, I think in general something like this - 700 flywheel power with ported stock or Mast/Brodix head and then we put on the F710 heads they made 725 fwhp or say from 600 rwhp to say 625 rwhp on chassis dyno (this kind of data). Also how is/was it under the curve like many of these manifold tests - "yeah it made 20 more hp at 6,800 but oops it lost 30 rwtq from 3,000-6,000 rpm". Once again NA - to tackle the many stout NA pump gas builds I see on here a lot.

Smokey B

No one on any forum has tested the heads. FB dyno test yes...When you see a Ls7 test and hp and tq has a major difference.... They have generally milled the heads for more compression and a larger cam. Or Factory unported Ls7 heads vs a Aftermarket head. Refer to the ls7 head test.

helicoil

iTrader: (104)

More or less clearance? 10 degree will not be as 'deep' into the valve pockets compared to a 12 degree valve angle.

Smokey B

Yeah I'm with u bro....read a post on FB about the pistons.....Major lift....and pistons needing changing. It was stuck in my mind..

95sscamaro

iTrader: (6)

The problem is they cant make them fast enough, with that being said I have ordered a set but my motor is what you have listed 440, 15.1, Solid Roller. I think that you have better options out there for less money on a smaller setup. They really shine up top so if you are not revving to the 8k range, you should look at the trickflow LS3 heads.

Smokey B

Honestly...liberty 11 degree ls3 heads sound better and cheaper....Funny 1 friend of mine on here tunes on his spare time....friend has a 427 with those ArchAngel ls7 heads.. Talk about Disappointed..got a text yesterday about Saturday's dyno test. Hoped for 600...it needs more like a half a century to get there. Cam was a btr stg 3...

jayyyw

Not surprised.

Someone in Florida made 803whp on the F710s with a 427ci. His trap speed is only 142mph in a C6 Z06 chassis. At that power, he should be closer to 150 or higher. Might be fine for peak numbers but missing the meat and potatoes.

ramairws6

iTrader: (33)

Pretty common knowledge already about their ports being disappointing.....

Smokey B

It had to be more than that...... didn't ask..

62nalide

iTrader: (2)

He can't drive the car, Jeff is the owner. He didn't build it for drag racing but highway pulls as he is new to the build.
I've done some great things with those F710s that I will say. On my customer's builds they made more power than any LS7 head I've used.

62nalide

iTrader: (2)

OP, IMO I'd stick to a stock LS7 casting and get them "fixed" ported. The F710s will make more but for what you are trying to do it's a pretty penny unless you plan to build a wild setup later.
I've used The F-110s F-310s F710s and F715s on customer builds. They are sweet and hands down one of the best castings I've put my hands on. I will be teaming up with FED to build a customer a 427/447ci N/A setup Spring 2020

spanks13

iTrader: (5)

Where is a video of this thing running? Have just seen the dyno vids.

Smokey B

That's the in thing now...show that it makes HP, for a DD with slower et's @ the track.

Daily Driver not lock step & in tune with what's under the hood..it's a DD.

jayyyw

That Racing Channel posted a vid about it.

62nalide

iTrader: (2)

You mean where he's only shifting it at 7500 because he's new to the car?
Not sure why folks are discrediting his car, he admits to know knowing how to drive it and he's no where 8200 he's trying to get the feel of it.

Smokey B

You gotta start somewhere..... If it has HP/ET they will come....Field of Dreams.....