Too bad the PRC heads don't perform like TFS heads at the track.

 

I actually noticed this as well.. We have a lot prc headed cars here with great power and this one tfs headed car beats them all given the same weight and cubes.. I found it wierd because when I glanced at both they looked very similar to each other.

 

If the horsepower is there but it doesn't perform, converter, gears , weight , overall combination is off for it not to perform.
I was going with sps cp series 245cc cathedrals but when my 416 turned into a 427 I decided to do ls3 heads. Especially with a llsr , 5000+ stall.

 

I somewhat agree but kinda disagree. Here is my reason why. Take two cars that both make 420 rwhp on the same dyno but two different combos. I feel like one car go be more responsive than the other. This is part of the reason every 420 rwhp does not perform as the other one.

 

I did a 416 a few years ago with Frankenstein 237cc Trick Flow porter castings (220's) and with a LLSR from Cam Motion and 11.7:1 it did 685FWHP. Great combo using a Super Victor and a 850 QFT carb.
by https://www.flickr.com/photos/154483046@N06/, on Flickr
by https://www.flickr.com/photos/154483046@N06/, on Flickr

 

Hey Tusky. Please don't take this as a negative but you seem to have more Hio growing in you. So if a f-body has a 400'+ cube motor it should run tens no matter what? Or it is a complete piece of **** failure that sucks? What if the car still has street tires on it? Or the combo is not for the track? Or the owner does not give more than two ***** if it goes tens? Obviously other people do. Without knowing the full story of the car. Yes sometimes people want to hit tens & can't so they need help. No problem with that. Helping others is good. Bashing others is not. To me of coarse. Some love talking ****, on others, to make themselves look good. Hey, at least my car is under 400ci right? Still it sucks to some & is awesome to me.

To your last post.. yes. Just going off a max hp number, even on same dyno, is not a good way to compare at all.

 

To me if you run 11s with 400 plus cube motor in a F body or can't get pass 127 trap speed you have wasted your money. It's cars trapping 118 to 122 with stock/ported 243 heads and a good proper cam. After all who wants to spend 5500 dollars on a shortblock then plus 3500 dollars on heads then get out performed by a car like mine that have a stock bottom end LS2 with LS3 heads and a GM LS3 intake. You should get what you pay for in life. I have less than 5000 dollars in whole motor and it trap what SOME 400 plus cube motors that costs 15 grand by whoever. Another thing... I'm not bashing no one car on here particular eithier. I'm just calling it how it is and how it should be.

 

Helicoil that's great power. Your compression is dead on for pump gas. It's a few guys pushing 12.1 compression on the pump gas. Any track times out that 416ci ?

 

Understand what you're saying I guess. But that's just you. That's not everyone out there with an LS car/f-body. Like I said. Now comparing 400ci cars to h/c SBE cars? Fine. Why not just use the 130mph bolt on cars to help people feel better. Or just tell them they're idiots like hiho does & let them know what you would do. Along with they did everything wrong and their car sucks. So someone who puts together a junkyard turbo motor for next to nothing & runs tens, or faster, is the best or something? So you're not bashing anyone particular? You're bashing everyone with a 400ci motor that doesn't run tens, or can't get past 127mph, at the track. You're calling it how it "should" be, or what you think, in your own mind. Those are your rules/thoughts. Not everyone.

To everyone: Have a great 4th of July!
To OP: sorry if messed thread up.

 

First of all I don't know 2 cents about turbo cars/builds. They don't interest me NONE. What does? All motor cars. Let's leave Hio out of this due to his car is not where MOST car f body cars are at weight wise. Most of our cars are 3450 to 36XX with driver with very few weight reduction mods. If you say I'm calling guys out.... so be it. Again it comes down to get what you paid for. What does your 383 stroker run? How much money you have tied up in it? If you trap 130 and runs 11.5s.... that tells me you have the power but your suspension just isn't dialed in.

 

Id run these on a 416 personally
http://www.proheads.com/Brodix_LS3.html

 

 

cam specs? has to be a medium sized one id guess

 

pretty good times for your hp level.....i just recently started going to the track after having my car for 5 years. i would think u would need 550 or a little more to get a 10.9 pass

 

At that weight and with those heads, that's an impressive trap speed

 

 

my 4 inch dump is ok. clearance is kinda shitty tho but i can't go over the axle so i just deal

 

Waiting on mamo 235 heads to come in. I'm also doing a ls7 swap in my buddies Camaro so I'll keep you posted. I should be putting the cars back together next week.

 

 

Great Decision on the Heads for Your Goals!
11.2-11,7:1 Compression depending on fuel ( 91 VS 93)
something like ~243*/249* 114*+3* .670"/.640"
17/8" LTs with true dual 3" Exhaust, FAST 102/102 TB, EWP, 32-36 Lb clutch/flywheel set up
and attention to details has made 675 BHP @ the Crank,
and has made 580+ RWHP ~6500 RPM with excellent drivability with a
very good tune in a M6 F Body.