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72chevy240z 12-08-2003 12:54 PM

goodwrench crate motor/ cam question
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A buddy and I dropped a 350 in a 72 datsun 240z. The motor is a goodwrench crate motor #10066038 made in mexico. I runs like a rapped ape but it needs a little more cam. The motor has about 20,000 miles on it.

I bought the summit 1104 cam and lifter kit 224 intake 224 ex. @.050 and 465 in. and ex.

The motor is stock the way it came. Is this cam too much lift for the stock springs? Will it run good with the 8.5 compression?
I did read and read and some say anything under .480 will be fine while others say anything over .450 will cause bind.
thanks bob

poncho62 12-08-2003 01:14 PM

I don't think your lift is excessive. I put the same cam in my 350 and have had no problems.

About the picture, whats the guy on the ground doing....adding air?

72chevy240z 12-08-2003 02:06 PM

The guy on the ground was looking at the exaust. The temp flex tube connecting the header to the side pipe popped off. After that I took a look, stuck my arm up there of course and burned that crap out of it. I still have that scar..haha.

So you had the same summit cam..the 1104? And are using it on stock valve springs and stock 8.5 compression? Auto or stick? I have a auto. will this cam be ok with the stock converter?

lluciano77 12-08-2003 02:17 PM

That cam should work well. I wouldn't go much bigger on duration unless you raise the compression a little. Why not buy better springs? If you have an air compressor you could easily swap them out.

johnsongrass1 12-08-2003 02:22 PM

Even the stock type Z28 spring would handle a .500 lift and they only cost around 40 dollars here. I wouldn't use them for anything over 6500 though.

72chevy240z 12-08-2003 02:24 PM

I'm not against installing new springs. Do I need to? What are stock gm springs rated at for max lift?

firestone 12-08-2003 05:08 PM

I assume that it was not recommended to go above .450 lift because that motor has Vortec heads on it. If this is the case, you will have to get bigger springs to accomodate a more aggressive cam. In order to put a bigger spring in the head, you will have to get the spring seat machined out to fit a bigger spring. Once you get that done, I would use the Comp XE274H cam. I had the XE268H cam in a 355 with Vortec heads that had the spring upgrade, and although the motor ran very well, it would have benefitted from a little bigger cam.


72chevy240z 12-08-2003 05:21 PM

I am not sure what the heads are that are on the motor. What heads came stock with a 92 goodwrench crate motor?

badknuckles 12-08-2003 07:03 PM

those springs are fine for that cam but i think that it looks like your backing over that guys head:spank:

72chevy240z 12-08-2003 07:40 PM

Just trying to make sure the 465 lift will be fine for stock springs. :thumbup:

badknuckles 12-08-2003 07:47 PM

they'll be ok

72chevy240z 12-08-2003 10:38 PM

1 Attachment(s)

72chevy240z 12-09-2003 02:36 PM

I popped the valve cover off and the heads are
33417369...90-up...350..........Gen.I Good wrench crate motor,
"Hecho en Mexico", 76cc
You guys still say I will be ok with a summit 1104 224/224 @.050 and .465 lift on both intake and exhaust?

firestone 12-09-2003 03:42 PM

Ok, if the heads are from a 1992 crate motor, then they are not vortec. The Vortec heads werent used until 1996. As far as the springs in the heads go, I would try getting a hold of someone who deals with GM performance parts directly.


72chevy240z 12-09-2003 06:29 PM

ok. wow, I have read and read tring to find out what the springs are rated at in these heads till my eye bleed. What do u guys think <i know I'm asking the same question over > if this cam will work in the goodwrench heads if i keep it under 5,000rpms?

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