Cam Profile for 350 Dual Quad Set Up
December 12th, 2015, 01:13 PM
#1
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Join Date: Jun 2012
Location: SoCal
Posts: 23
Cam Profile for 350 Dual Quad Set Up
Hi guys,
I have a 69 Cutlass that I am thinking of doing a dual quad setup on. I know the single 4 is usually the best way to go for a street motor but thought this could be worth the cool factor and have some get up.
Motor is a 69 350 with #5 heads, stock. It has 1 5/8th's headers. It was rebuilt at some point but I don't know anything about it. It runs well and has some grunt but doesn't feel like a high compression, nearing 10 to 1 type motor. TH350 trans with 12 bolt Olds and 2.73's I think.
Trans leaks so I am getting that fixed so I can go with a higher stall converter and I want to put 3.08 or 3.23 posi gears in it.
But the big question is that if I went to an Offy dual quad set up with 2 500cfm Edelbrocks what kind of cam profile should I go with? I want to keep using the power brakes and steering but I'd like a cam that works great with the combo but also has a noticeable idle. I searched the forums but I didn't find anything relating to cam choices for this combo and even less info on it for a SBO. I have a set of roller rockers that I'll do with the cam change.
J
I have a 69 Cutlass that I am thinking of doing a dual quad setup on. I know the single 4 is usually the best way to go for a street motor but thought this could be worth the cool factor and have some get up.
Motor is a 69 350 with #5 heads, stock. It has 1 5/8th's headers. It was rebuilt at some point but I don't know anything about it. It runs well and has some grunt but doesn't feel like a high compression, nearing 10 to 1 type motor. TH350 trans with 12 bolt Olds and 2.73's I think.
Trans leaks so I am getting that fixed so I can go with a higher stall converter and I want to put 3.08 or 3.23 posi gears in it.
But the big question is that if I went to an Offy dual quad set up with 2 500cfm Edelbrocks what kind of cam profile should I go with? I want to keep using the power brakes and steering but I'd like a cam that works great with the combo but also has a noticeable idle. I searched the forums but I didn't find anything relating to cam choices for this combo and even less info on it for a SBO. I have a set of roller rockers that I'll do with the cam change.
J
Last edited by jbarnett; December 12th, 2015 at 01:18 PM.
December 12th, 2015, 01:28 PM
#2
Out of Line, Everytime😉
Join Date: Dec 2006
Location: Melville, Saskatchewan
Posts: 8,915
You will need to figure out the compression ratio, was it two or four barrel originally? I would go with the AVS version or even better dual Street Demon 625's. There is an ultra low profile dual quad and a taller version. I would defintely use 1" or 2" phonelic spacers on the intake with Edelbrock carbs. I considered one for the cool factor.
December 12th, 2015, 01:48 PM
#3
Registered User
Join Date: Aug 2007
Posts: 2,250
Hi guys,
I have a 69 Cutlass that I am thinking of doing a dual quad setup on. I know the single 4 is usually the best way to go for a street motor but thought this could be worth the cool factor and have some get up.
Motor is a 69 350 with #5 heads, stock. It has 1 5/8th's headers. It was rebuilt at some point but I don't know anything about it. It runs well and has some grunt but doesn't feel like a high compression, nearing 10 to 1 type motor. TH350 trans with 12 bolt Olds and 2.73's I think.
Trans leaks so I am getting that fixed so I can go with a higher stall converter and I want to put 3.08 or 3.23 posi gears in it.
But the big question is that if I went to an Offy dual quad set up with 2 500cfm Edelbrocks what kind of cam profile should I go with? I want to keep using the power brakes and steering but I'd like a cam that works great with the combo but also has a noticeable idle. I searched the forums but I didn't find anything relating to cam choices for this combo and even less info on it for a SBO. I have a set of roller rockers that I'll do with the cam change.
J
I have a 69 Cutlass that I am thinking of doing a dual quad setup on. I know the single 4 is usually the best way to go for a street motor but thought this could be worth the cool factor and have some get up.
Motor is a 69 350 with #5 heads, stock. It has 1 5/8th's headers. It was rebuilt at some point but I don't know anything about it. It runs well and has some grunt but doesn't feel like a high compression, nearing 10 to 1 type motor. TH350 trans with 12 bolt Olds and 2.73's I think.
Trans leaks so I am getting that fixed so I can go with a higher stall converter and I want to put 3.08 or 3.23 posi gears in it.
But the big question is that if I went to an Offy dual quad set up with 2 500cfm Edelbrocks what kind of cam profile should I go with? I want to keep using the power brakes and steering but I'd like a cam that works great with the combo but also has a noticeable idle. I searched the forums but I didn't find anything relating to cam choices for this combo and even less info on it for a SBO. I have a set of roller rockers that I'll do with the cam change.
J
December 12th, 2015, 01:59 PM
#4
Registered User
Thread Starter
Join Date: Jun 2012
Location: SoCal
Posts: 23
If it has been rebuilt and the pistons replaced, all bets are off. Your CR could be as low as 7.5 to 1 or as high as 10 to 1. Putting a dual quad high rise on a low comp small block is a recipe for a turd with no bottom end. As 307/403 recommended, you will need to determine the true CR and go from there. I like old-school cool stuff, but if you end up spending a bunch of money on something that is no fun to drive, what is the point? You also do not know what cam is in it.
It doesn't have a very radical cam and I know it's hyraulic. It reminds me of how this old SBF sounded and idled with a Comp 260 in it. I know that's apples to oranges but this is mild cam from driving it.
For the sake of argument let's say the motor is 9 to 1. I'll get it checked at some point before moving forward but I'd like to get dialogue going at any rate.
J
December 12th, 2015, 02:49 PM
#5
Registered User
Join Date: Aug 2007
Posts: 2,250
True enough. Throwing money at something to not get what you want sucks.
It doesn't have a very radical cam and I know it's hyraulic. It reminds me of how this old SBF sounded and idled with a Comp 260 in it. I know that's apples to oranges but this is mild cam from driving it.
For the sake of argument let's say the motor is 9 to 1. I'll get it checked at some point before moving forward but I'd like to get dialogue going at any rate.
J
It doesn't have a very radical cam and I know it's hyraulic. It reminds me of how this old SBF sounded and idled with a Comp 260 in it. I know that's apples to oranges but this is mild cam from driving it.
For the sake of argument let's say the motor is 9 to 1. I'll get it checked at some point before moving forward but I'd like to get dialogue going at any rate.
J
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