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Thread: Apporximate red line of heads...
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10-06-2010, 04:50 PM #1
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Malano Red- 1978 Datsun 280z
Apporximate red line of heads...
We want to know what the redline of the heads is... When will they stop flowing?
We want to take the motor to 7k.
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10-06-2010, 04:54 PM #2
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Red Tint Jewelcoat- 2008 Trailblazer SS
Depends on cam more than heads.
Willing to bet those heads perform fine to 7000.
Cam isn't gonna need to spin that high though.
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10-06-2010, 04:55 PM #3
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Malano Red- 1978 Datsun 280z
Wont need to but CAN it without loosing too much power.
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10-06-2010, 04:57 PM #4
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Red Tint Jewelcoat- 2008 Trailblazer SS
Won't loose much...will probably drop off after about 6400 though....
Just a guess though.
Make sure you get a very solid valvetrain. Morel lifters, good springs, etc...
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10-06-2010, 05:02 PM #5
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Malano Red- 1978 Datsun 280z
The springs are listed above and we were really concidering the morels... Wants the racing ones not the street ones.
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10-07-2010, 05:11 AM #6
mark458,,,to be honest you really picked a cam that is not going to use the full potential of the heads you picked.
Your going to have alot of power starting around 2700rpm but I don't see that cam making power past 6300rpm.
People with the TSP V2 peak at 6500rpm in most cases.
Yes your heads can handle 7000rpm ,but the cam you picked cannot.
Ether way it will be a fun ride with the power your going to be making down low.
Also what intake and TB are you going with??
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10-07-2010, 06:01 AM #7
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Malano Red- 1978 Datsun 280z
fast 92mm
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10-07-2010, 06:26 AM #8
If your FAST 92mm intake hasn't been ported I would have it done,,,,word on the streets are that you can pickup atleast an extra 10hp or more.
Also if you don't have a TB yet I would look for a PTM TB because the FAST TB are known for the blade sticking agianst the housing.Last edited by incbed; 10-08-2010 at 04:40 AM.
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10-07-2010, 01:34 PM #9
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Malano Red- 1978 Datsun 280z
We have the fast TB. How can you port plasic?
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10-07-2010, 03:35 PM #10
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Malano Red- 1978 Datsun 280z
The reason we dont think the head will flow all the way to 7k is because its stroked out to 383. 11:1 compression.
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10-07-2010, 04:14 PM #11
Heads are fine... cam is way off for that setup...
GM EFI Tuner
2002 Trans Am WS6 - 9.41@143mph, #3675, on pump gas and drag radials - sold
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10-07-2010, 04:39 PM #12
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Malano Red- 1978 Datsun 280z
Recommended cam? If we are going to change the cam might as well make it mech lift
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10-07-2010, 04:45 PM #13
You need to get the cam spec'd for the entire combo - I would call Comp and get a custom grind - especially if you go solid... Is it an automatic? What convertor? Street car or race only? What's it weigh? What gear are you running?
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10-07-2010, 05:53 PM #14
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Malano Red- 1978 Datsun 280z
3.73 gear 2800lbs both street and race some drag some road course 3800 stall 4l60e
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10-07-2010, 06:03 PM #15
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red- 2000TA
don't need a mech cam.call EPS cams.
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10-08-2010, 05:16 AM #16
I'm not sure what kind of porting tool that is used on the plastic intakes ,but I know there are alot of people that do it,,,Vengeance racing ports the FAST intakes and Patrick G ports them also.
My FAST was already ported when I bought it.
Also if I was you I wouldn't be trying to chase a MAX RPM especially 7k,,,because you'll have to have atleast a 239/247 or larger cam.
Also if your heads had Titanium valves then revving to 7krpm would be easier.
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10-08-2010, 08:40 AM #17
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10-08-2010, 05:04 PM #18
I would stay away from a solid with that usage... For a 383 with that compression, if you want a shelf cam, I would go with the Texas Speed Magic Stick 3 - 237/242 .603/.609" or, go with a custom grind from Patrick G or directly from Comp...
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10-12-2010, 01:45 PM #19
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- 1978 280z- ls1-v8
My son posted the wrong cam specs. My fault . The cam that is installed is a comp cam 239/247 .624 .624 lsa 114
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10-12-2010, 02:12 PM #20
Now you're talkin... Should work well!
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