in a dilema. the cathedral vs rec heads
12-01-2018, 06:34 AM
#21
Rectangular shift the powerband to the right which is good for max effort cars. Cathedral shift the powerband to the left which is good for street cars. A street/strip car can use either and which ever you choose will be wrong if you post about it on here.
Torque does win races if you have a heavy car on an 1/8 mile track. A light car on a 1/4 mile wants more top end. A mid-weight car that runs both can use either and which ever you choose will be wrong if you post about it on here.
Torque does win races if you have a heavy car on an 1/8 mile track. A light car on a 1/4 mile wants more top end. A mid-weight car that runs both can use either and which ever you choose will be wrong if you post about it on here.
A squarthedral engine would have one cathedral head and one rectangular
OP,
I wouldn't swap from a good correctly ported quality set of cathedrals for rectangular or vice-versa for a daily driver or street car. There would likely be something much better to spend $$$ on like a NOS system, saving for a Procharger etc.
Strip mainly or race car, rectangular.
Cathedrals are less tricky or confusing to cam correctly generally speaking than rectangular which can be a finicky with correct split exhaust duration in some cases. You can get good results slapping a single pattern cam or small split cam in cathedrals and rectangular will want more split typically.
So if the OP swaps heads he will likely want to consider a new cam for best results.
Last edited by 99 Black Bird T/A; 12-01-2018 at 06:44 AM.
12-01-2018, 10:03 AM
#24
10 Second Club
12-01-2018, 12:37 PM
#26
WELL IF YOU BOLT UP A SET OF LS3 HEADS YOU WILL MAKE 100HP AND 100TQ INSTANLTY AND GAIN 1.5 SECONDS IN THE 1.4 MILE, COME ON EVERYONE KNOWS THAT. OH AND DONT FORGET YOUR TITANIUM VALVE SPRING RETAINERS, THERE GOOD FOR ANOTHER 20HP. 
12-01-2018, 01:30 PM
#27
Moderator
iTrader: (4)
Join Date: Jul 2014
Location: My own internal universe
Posts: 10,446
Received 1,836 Likes
on
1,145 Posts
Go look at the gmpp 243 heads. They look like squathedrals
12-01-2018, 01:53 PM
#28
TECH Senior Member
12-01-2018, 06:22 PM
#30
TECH Senior Member
12-02-2018, 08:03 AM
#32
Moderator
iTrader: (4)
Join Date: Jul 2014
Location: My own internal universe
Posts: 10,446
Received 1,836 Likes
on
1,145 Posts
How to make a big block torquey:
Step 1 -- you dont need to, because big cube engines make torque even on accident
Step 1 -- you dont need to, because big cube engines make torque even on accident
12-11-2018, 10:15 PM
#34
Aftermarket cathedral is better than a stock casting ls3
Stock casting ls3 is better than a stock casting cathedral
Aftermarket ls3 is most of the time better than an aftermarket cathedral
I lile cathedral heads personally .. I have cathedrals on my 416 and make a touch over 570 rwhp on motor.
but I really really want to build a stock casting ls3 headed motor to see how far I can push stock castings .. ugh
4150 on a vic jr is going to drive like **** . And not make power until 6000 rpm. Better plan on spinning 7500+
I like fast 102's. For fbodys. Highrams for trucks
Stock casting ls3 is better than a stock casting cathedral
Aftermarket ls3 is most of the time better than an aftermarket cathedral
I lile cathedral heads personally .. I have cathedrals on my 416 and make a touch over 570 rwhp on motor.
but I really really want to build a stock casting ls3 headed motor to see how far I can push stock castings .. ugh
4150 on a vic jr is going to drive like **** . And not make power until 6000 rpm. Better plan on spinning 7500+
I like fast 102's. For fbodys. Highrams for trucks
12-12-2018, 06:33 AM
#40
Moderator
iTrader: (4)
Join Date: Jul 2014
Location: My own internal universe
Posts: 10,446
Received 1,836 Likes
on
1,145 Posts