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Old 02-02-2013, 07:22 AM
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Originally Posted by techinspector1 View Post
Not if you own a Sawzall!!!!
One of the guys on the Datsun forum suggested that these will work....
Garage Sale - Musclemaxx 1968-72 Nova Headers SBC - Speedway Motors, America's Oldest Speed Shop
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I'm guessing he's using shorty headers with a single 3-4" exhaust, at least that's about the only affordable option I see on a 280z.

Very true the center dump shortys are the only affordable option to fit the datsun. However i just bought my first welder from harbour freight and and probably going to buy some cheap long tube headers and modify them to fit the datsun.

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Old 02-02-2013, 07:35 AM
67L 67L is offline
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3000 stall?

I thought the 268 cams were fine with factory stall...unless you are racing. As for the carb: the 600 will be a restriction. I just finished a 383 build. 422hp at 5200rpms...463 lbs at 4300rpms...but 1.6" vacuum at WOT so it was carb limited. 650 or 750 will be best. If you use an Edelbrock 600 cfm, go with 104 secondaries, springs that open at 7" vacuum and change the metering rods. Otherwise you will be lean above 4000 rpms
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Old 02-02-2013, 07:40 AM
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heads

One thing to consider...if you're running 9.5 to 1 compression currently...would these heads have a smaller combustion chamber and increase your compression to a degree that running on pump gas is no longer possible? I have no experience on Patriot heads...but from what I've read there are some complaints about oil return holes and machining on the gasket surfaces that causes some sealing problems. In otherwords, the head gaskets and intake gaskets leak. But, this is only what I've read and have no personal experience. Just keep in mind that if a deal sounds too good to be true...it usually is.
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Old 02-02-2013, 08:00 AM
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Ok guys i took the heads in question to a local machine shop known in town for there engine/head work. The guys there looked the heads over and said they were in excellent condition with not problems. They also said that from what they could see they were almost 100% positive that the heads had never been run on a motor before.

So i went ahead and negociated with the selled and bough the:

Patriot Freedom heads
Edelbrock intake with JEGS liquid filled temp gauge
Fel-pro Intake and exhaust gaskets
MSD billet distributor
MSD coil
Summit racing mutli spark ignition box with 5500rpm rev limiter.
plug wires

For a Grand total for $510.






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Old 02-02-2013, 08:07 AM
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Originally Posted by snakebit68 View Post
One thing to consider...if you're running 9.5 to 1 compression currently...would these heads have a smaller combustion chamber and increase your compression to a degree that running on pump gas is no longer possible? I have no experience on Patriot heads...but from what I've read there are some complaints about oil return holes and machining on the gasket surfaces that causes some sealing problems. In otherwords, the head gaskets and intake gaskets leak. But, this is only what I've read and have no personal experience. Just keep in mind that if a deal sounds too good to be true...it usually is.
No thats my bad i calculated it 882's with 64cc chamber instead of 76. So I think with my new heads im going to be at about 9.75:1 compression.
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Old 02-02-2013, 08:09 AM
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Originally Posted by 67L View Post
I thought the 268 cams were fine with factory stall...unless you are racing. As for the carb: the 600 will be a restriction. I just finished a 383 build. 422hp at 5200rpms...463 lbs at 4300rpms...but 1.6" vacuum at WOT so it was carb limited. 650 or 750 will be best. If you use an Edelbrock 600 cfm, go with 104 secondaries, springs that open at 7" vacuum and change the metering rods. Otherwise you will be lean above 4000 rpms
I used the holley carb selector tool and it said for my motor (Mild street) I should use a 600cfm vac sec. But i am thinking about using a 650 DP. I think 750 would be too much carb for my motor and the throttle response would suffer as a result.
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Old 02-02-2013, 08:21 AM
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5500 rpm is too low for the chip.I use a 6 k chip to soften the engine as the tires break loose in first and second. Maybe put a 6400 rpm chip in there before you install the ignition. I like the little 650 DP,it will limit top end a lot.If your negine is way below 375 HP then use the 650. I prefer the 750
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Old 02-02-2013, 08:33 AM
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heads

I like the 650 DP as well. Vinniekq's right about it limiting top end though...especially a 600. 600's really only fuction well on a bone stock 350. Why did you set your rev limiter to 5500? I set my shift light at 7000 and my rev limiter at 7500. Vinnie...you seem to be on top of every thread in here. Glad to know you're around and taking time to help everyone out in here. You seem to know your stuff.
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Old 02-02-2013, 08:40 AM
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lol i thought my motor would never be able to rev past 5500rpm.
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Old 02-02-2013, 08:47 AM
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Logan,you dont set the rev limiter at the red line or shift point,you set it a little higher as a safety. If you miss a shift/break a driveline part/lose traction,the rev limiter stops the engine from turning insideout.
snakebit, I have a little too much spare time atm,lol.
off to work today though.
I was going to PM you about your truck engine,I think we have similar parts in our engines,,,
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Old 02-02-2013, 08:48 AM
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heads

You know best where your engine ceases to make power...if thats 5500 then set your rev limiter at 6000 or 6200
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Old 02-02-2013, 09:01 AM
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heads

Yeah Vinnie, I think you're probably right. I'm new to this forum and would love to talk shop with you about our engines and cars. I was curious what year your car is? What engine you running? Throw them details at me brother. Maybe I can steal a secret or two from you. LOL
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Old 02-02-2013, 09:13 AM
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Originally Posted by vinniekq2 View Post
Logan,you dont set the rev limiter at the red line or shift point,you set it a little higher as a safety. If you miss a shift/break a driveline part/lose traction,the rev limiter stops the engine from turning insideout.
snakebit, I have a little too much spare time atm,lol.
off to work today though.
I was going to PM you about your truck engine,I think we have similar parts in our engines,,,

Got it...I'll get another chip and bump the rev limit up to 6500. Considering this motor is going into a 70 Datsun 240Z that weighs in at 2300lbs; Im expecting a lot of traction lose.
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Old 02-02-2013, 09:35 AM
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Guys now that i have a head that can take a .575 lift would it be beneficial to upgrade the Hydraulic flat tappet cam? Would a comp cam 12-214-4 be a good choice? or is there a better option that will give me more power while keeping the car streetable. I would like to go as aggressive as possible but this is a 70% street car, 30% autocross/strip. I would also like to have enough vac to run power brakes and vac advance on my distributor. I have T5 mustang transmission and i have 4:11 gears in my diff.

http://www.summitracing.com/parts/cc...make/chevrolet

Camshaft, Hydraulic Flat Tappet, Advertised Duration 305/305, Lift .525/.525, Chevy, Small Block

Last edited by logan1; 02-02-2013 at 09:45 AM.
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Old 02-02-2013, 09:46 AM
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Would these be a good set of heads for my application?

logan1, when you start assembling your engine check your deck clearance. Measure from the top of the piston at TDC to deck of the block. If it has not been milled it will probably be .025. You can use a straight edge and a set of feeler gauges to get your measurement. measure from front to back, parallel with the piston pin. Get a set of these head gaskets to set the quench at .040 if your deck clearance is .025. Fel-Pro Performance Head Gaskets Q1094 - SummitRacing.com.
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