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Author Topic: Opinions on what cam to use, my combo inside.  (Read 3372 times)
5.0LRX7
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« on: August 25, 2014, 08:17:56 pm »

Ok...

Theres about a billion OTS cam options, maybe you guys can help me with the best option for me.

Car is a 1983 rx7. Weight around 2200-2300 lbs with me in it.

The end motor combo will be '87 5.0l roller H.O. block, gt40 heads, not sure on intake manifold yet because im trying to figure out what will clear my hood, t5, and Megasquirt EFI.

With the car being quite a bit lighter than the standard 5.0l car, is there a cam that will be advantageous?

Also, im aware that the springs/retainers need upgraded for the gt40/40p heads. What are good options there?

Car is aiming to be a good all around car. Will prolly 1/4 mile it, auto x, slide it around, and drive it to work on nice days.

Thanks for the help!
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David Claflin
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« Reply #1 on: August 25, 2014, 09:37:30 pm »

Depends what you intend to do with it.

If you're just building something to bang around town something in this range
http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=1060&sb=2


If you're going to race it then something like this one
http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=1061&sb=2


The 26095 springs might work well, call comp first to be sure
http://www.compcams.com/Products/CC-'Valve%20Springs%20By%20Design'-0.aspx
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1990 Red LX, 306, 80MM, ported gt40's, ported explorer upper accufab longtubes, 3" exhaust, 4.30's, 336/331
1985 LTD LX 347, 205 11R's, TFS-R, 90MMTB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
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« Reply #2 on: August 25, 2014, 11:33:54 pm »

With the cars light weight and the T5s gearing, first gear will likely be useless with most commonly used cams.

I think something like a 1087 copy would probably do fairly well for you. It will scrub off a little torque while maintaining reasonable drivability. Its lift is also within the range of most common spring kits for those heads.

Here's some info on setting up springs on E7/GT40/GTP heads:
http://sbftech.com/index.php/topic,31484.0.html
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
5.0LRX7
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« Reply #3 on: August 27, 2014, 12:32:40 pm »

Awesome. Thanks for the information!
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