243 or ls3 heads on 6.0 bored 65over, nitrous setup
243 or ls3 heads on 6.0 bored 65over, nitrous setup Asking the experts here..... I have a 6.0 being bored to 4.065 (ls3 specs).
I currently have a ls6 intake, several sets of non ported heads (243, 799 and 317).
My question is... should I build my setup with ls6 intake which includes a 200 shot nitrous outlet plate system and pay to port my 243's or Just sell the heads, intake etc and get a set of ls3 heads and ls3 intake?
For a cruise car that will see track once in a while I wasn't sure which direction to take. I Don't want to spend money on porting 243's If it better to sell my combo and do right the first time. You can get new cnc ls3 heads for 1k-1.2k ready to go or have a line on used for $500.
Cam I have is 227/235 613/620 on a 111 separation but not sure if that will work well with the square ports.
This is going in a 67 Camaro, 3:73 rear, 3500 stall, 3350lbs.
NON daily driver but will take to track days, car shows and power tour cruises etc.
I currently have a ls6 intake, several sets of non ported heads (243, 799 and 317).
My question is... should I build my setup with ls6 intake which includes a 200 shot nitrous outlet plate system and pay to port my 243's or Just sell the heads, intake etc and get a set of ls3 heads and ls3 intake?
For a cruise car that will see track once in a while I wasn't sure which direction to take. I Don't want to spend money on porting 243's If it better to sell my combo and do right the first time. You can get new cnc ls3 heads for 1k-1.2k ready to go or have a line on used for $500.
Cam I have is 227/235 613/620 on a 111 separation but not sure if that will work well with the square ports.
This is going in a 67 Camaro, 3:73 rear, 3500 stall, 3350lbs.
NON daily driver but will take to track days, car shows and power tour cruises etc.
Cathedral port heads or rectangle port heads? Great question! I wonder why this hasn't been asked more oftern...
FWIW, I had 241's on my iron 6.2L and I was pretty happy with them. Just put 243's on and once I finish up a few other things, I'll have the car fired up again and back on the dyno.
FWIW, I had 241's on my iron 6.2L and I was pretty happy with them. Just put 243's on and once I finish up a few other things, I'll have the car fired up again and back on the dyno.
Not claiming to be an expert on this subject but it just seems like a no brainer when comparing stock castings & intakes that the square port ls3 heads & intake are the way to go on a 4 inch+ bore. The heads flow 320 cfm untouched, ls3 intakes can be had much cheaper than an ls6 & can fit a 92 mm tb compared to maybe an 85 mm on an ls6. I made $$$ selling my ls6 intake & top end(TFS215s), got close to $3k & got less than $2k into brand new gm cnc ls3 heads, BTR .660 springs, & intake w/ everything! The "experts" will say your best bet is a good set of cathedrals, like some TFS235s or 255s w/ extra hand porting & how they have better port velocity blah blah! Probably but you'll pay $4k for them! I'll find out what kind of power mine makes Friday, its insane
exactly flint wrench... I have all these ls1/ls6 parts worth good money and could sell the Cathedral heads and ls6 intake/nitrous works setup and have good money towards ls3 square port setup.
My concern is the old square port vs cathedral port argument. Also why should I spend big cash on porting Cathedral heads to get them to flow close to STOCK square ports. I do understand Cathedral may have better port velocity but I'm not fighting for every bit of HP I just want to do right the first time and have future growth. Porting the 243's with good valve job Is going to be 600-750. For a little more coin I can have NEW heads.
Suggestions or am I thinking wrong on this?
My concern is the old square port vs cathedral port argument. Also why should I spend big cash on porting Cathedral heads to get them to flow close to STOCK square ports. I do understand Cathedral may have better port velocity but I'm not fighting for every bit of HP I just want to do right the first time and have future growth. Porting the 243's with good valve job Is going to be 600-750. For a little more coin I can have NEW heads.
Suggestions or am I thinking wrong on this?
cathedral heads.. have tuned countless 4" bore ls engines with rectangle heads and although they drop some good dyno numbers they were a 2 mph slower than the cathedral setup in the same car with a custom grind setup for the new top end
since you are 65 over i suggest ls3 heads since you wont have valve shrouding issues.
since you are 65 over i suggest ls3 heads since you wont have valve shrouding issues.
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Asking the experts here..... I have a 6.0 being bored to 4.065 (ls3 specs).
I currently have a ls6 intake, several sets of non ported heads (243, 799 and 317).
My question is... should I build my setup with ls6 intake which includes a 200 shot nitrous outlet plate system and pay to port my 243's or Just sell the heads, intake etc and get a set of ls3 heads and ls3 intake?
For a cruise car that will see track once in a while I wasn't sure which direction to take. I Don't want to spend money on porting 243's If it better to sell my combo and do right the first time. You can get new cnc ls3 heads for 1k-1.2k ready to go or have a line on used for $500.
Cam I have is 227/235 613/620 on a 111 separation but not sure if that will work well with the square ports.
This is going in a 67 Camaro, 3:73 rear, 3500 stall, 3350lbs.
NON daily driver but will take to track days, car shows and power tour cruises etc.
I currently have a ls6 intake, several sets of non ported heads (243, 799 and 317).
My question is... should I build my setup with ls6 intake which includes a 200 shot nitrous outlet plate system and pay to port my 243's or Just sell the heads, intake etc and get a set of ls3 heads and ls3 intake?
For a cruise car that will see track once in a while I wasn't sure which direction to take. I Don't want to spend money on porting 243's If it better to sell my combo and do right the first time. You can get new cnc ls3 heads for 1k-1.2k ready to go or have a line on used for $500.
Cam I have is 227/235 613/620 on a 111 separation but not sure if that will work well with the square ports.
This is going in a 67 Camaro, 3:73 rear, 3500 stall, 3350lbs.
NON daily driver but will take to track days, car shows and power tour cruises etc.
With you mentioning a N2o set up this is a bit of concern.
As far as the heads go it depends on if you would like to save a few $ and run the stuff you have vs obtaining something else.
A set of CNC'd cathedrals will flow in the low 300's a set of Rec ports will flow in the 350's+
You did not mention compression or stroke.
If it's a stock stroke with some lower compression the cathedrals will be the way to go for a more liner curve.
If its a 4" or better arm and some compression the rec port is the way to go.
We can always do a set of rec port heads with a killer exhaust port and a good v/j and some bowl work for a smaller lower compression combo.
If you are going to power tour this car we recommend going with a overall reliable proven package that way you can drive and not repair/replace.
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Brett Foote exactly flint wrench... I have all these ls1/ls6 parts worth good money and could sell the Cathedral heads and ls6 intake/nitrous works setup and have good money towards ls3 square port setup.
My concern is the old square port vs cathedral port argument. Also why should I spend big cash on porting Cathedral heads to get them to flow close to STOCK square ports. I do understand Cathedral may have better port velocity but I'm not fighting for every bit of HP I just want to do right the first time and have future growth. Porting the 243's with good valve job Is going to be 600-750. For a little more coin I can have NEW heads.
Suggestions or am I thinking wrong on this?
My concern is the old square port vs cathedral port argument. Also why should I spend big cash on porting Cathedral heads to get them to flow close to STOCK square ports. I do understand Cathedral may have better port velocity but I'm not fighting for every bit of HP I just want to do right the first time and have future growth. Porting the 243's with good valve job Is going to be 600-750. For a little more coin I can have NEW heads.
Suggestions or am I thinking wrong on this?
My concern is the old square port vs cathedral port argument. Also why should I spend big cash on porting Cathedral heads to get them to flow close to STOCK square ports. I do understand Cathedral may have better port velocity but I'm not fighting for every bit of HP I just want to do right the first time and have future growth. Porting the 243's with good valve job Is going to be 600-750. For a little more coin I can have NEW heads.
Suggestions or am I thinking wrong on this?
Suggestions or am I thinking wrong on this?
If you're not worried about "extracting every last HP" then I would think flow specs would be very low on your priorities list and other "intangibles" that cathedral ports have over square ports would be high on that list.
You're a little bit contradicting there. You mention not wanting to squeeze out every single HP but then worry about flow numbers, which BTW mean very little.
If you're not worried about "extracting every last HP" then I would think flow specs would be very low on your priorities list and other "intangibles" that cathedral ports have over square ports would be high on that list.
If you're not worried about "extracting every last HP" then I would think flow specs would be very low on your priorities list and other "intangibles" that cathedral ports have over square ports would be high on that list.
I did contradict myself.. What I meant by that was at this moment I'm not worried about squeezing every bit of power but later plans may include stroker kit. I definitely plan 200 shot with plate system.
I know this issue has been beaten to death... sorry, I did search posts but wanted to get others opinion what they would do since I do have some decent cathedral parts (have to at least port heads and intake though) but could sell it all and with a few hundred more be setup long term.
Another thing I consider is with the price and availability of 6.0/6.2 blocks becoming easier and cheaper in the coming years.
I know this issue has been beaten to death... sorry, I did search posts but wanted to get others opinion what they would do since I do have some decent cathedral parts (have to at least port heads and intake though) but could sell it all and with a few hundred more be setup long term.
Another thing I consider is with the price and availability of 6.0/6.2 blocks becoming easier and cheaper in the coming years.