Cathedral heads on a 416?
#21
TECH Veteran
Too bad the PRC heads don't perform like TFS heads at the track.
#22
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.
#23
TECH Junkie
iTrader: (2)
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 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.
#24
TECH Veteran
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 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.
#25
9 Second Club
iTrader: (104)
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
#26
11 Second Club
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 your last post.. yes. Just going off a max hp number, even on same dyno, is not a good way to compare at all.
#27
TECH Veteran
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 your last post.. yes. Just going off a max hp number, even on same dyno, is not a good way to compare at all.
#28
TECH Veteran
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 ?
#29
11 Second Club
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.
To everyone: Have a great 4th of July!
To OP: sorry if messed thread up.
#30
TECH Veteran
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.
To everyone: Have a great 4th of July!
To OP: sorry if messed thread up.
#31
#36
9 Second Club
iTrader: (11)
cam was 247/254 .623/ .623 114+4 and actually only made 522rwhp when it ran those times. I’ve since switched cams slightly, had the chambers opened to match the 4.065” bore, and went from a 1-3/4” header to an 1-7/8”. Still through a 3” slp dual/ dual exhaust. Might do a 4” soon because I’m bored and starting to get the desire again.
#37
TECH Junkie
iTrader: (11)
cam was 247/254 .623/ .623 114+4 and actually only made 522rwhp when it ran those times. I’ve since switched cams slightly, had the chambers opened to match the 4.065” bore, and went from a 1-3/4” header to an 1-7/8”. Still through a 3” slp dual/ dual exhaust. Might do a 4” soon because I’m bored and starting to get the desire again.
#38
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Join Date: Sep 2006
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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.
#40
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Join Date: Aug 2009
Location: Coast of San Mateo County Between Pacifica & HMB
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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.