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PRC 5.3L, 62cc, stage 2.5, will this cam fit?

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Old 08-22-2007, 02:17 PM
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Default PRC 5.3L, 62cc, stage 2.5, will this cam fit?

2.02/1.575 valves,

will this cam fit without having to flycut?

236*-240*-.631"-.610", 111+2 lsa

i have done research, have called, but still feel compelled to ask you guys for input/feedback/ideas.

thanks in advance for your time.

Last edited by jegten; 09-14-2007 at 01:23 AM.
Old 08-22-2007, 04:45 PM
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Your sig states that you installed a .040" head gasket. With those valves and that head gasket, no way will that cam fit.
Old 08-22-2007, 11:24 PM
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Not a chance. Fly cut and be happy.
Old 08-23-2007, 02:06 AM
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thanks for the quick responses, guys. i appreciate it.

what profile would fit, even if pushing the envelope without flycutting?

again, thanks!
Old 08-23-2007, 10:08 AM
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I dont think you'll find anyone guessing anything bigger then 228 on a 112 would work. serioiusly, stick with the first cam and just suck it up and flycut. if you put in a smaller cam just to save a couple hundy (after spending all this money so far) you'll be shooting yourself for it later. several sponsors rent the nec. equipment to do the job. in the end. it'll cost you about $200 if you do it yourself. not too bad since it'll allow you to have a KILLER setup with the great quench, SCR, DCR and great power cam. see my sticky at the top of the forum and you'll see its not that bad at all.

chris
Old 08-23-2007, 11:53 AM
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Originally Posted by Irocss85
I dont think you'll find anyone guessing anything bigger then 228 on a 112 would work. serioiusly, stick with the first cam and just suck it up and flycut. if you put in a smaller cam just to save a couple hundy (after spending all this money so far) you'll be shooting yourself for it later. several sponsors rent the nec. equipment to do the job. in the end. it'll cost you about $200 if you do it yourself. not too bad since it'll allow you to have a KILLER setup with the great quench, SCR, DCR and great power cam. see my sticky at the top of the forum and you'll see its not that bad at all.

chris
Agreed!
Old 08-23-2007, 06:27 PM
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Just flycut, its not that big a deal.
Old 08-23-2007, 09:19 PM
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I just got my custom cam today from Patrick G and the final specs were 231/233 .613/.594 111+2lsa. I have the same exact heads. I would go custom. But flycutting is not a bad idea either. I wish I would of found a truck to take my car to the shop to go get it done. I would've stick w/ my vindicator cam. Oh well.
Old 08-23-2007, 09:24 PM
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patrick thinks that cam will clear? I'd be curious to see the clearance #s when you check. post them up for those heads/what gasket/and that cam.

chris
Old 08-23-2007, 09:49 PM
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hmm...
can i reuse the cometics?
i would need new head bolts, and the whole thing, right?
how much flycutting is needed?

thanks!
Old 08-23-2007, 09:54 PM
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how much is what you gotta find out by measuring. then rechecking once your cut is done.
I think you can reuse cometics, they say you can. I have never done it though.
yes new head bolts if you have GM head bolts and all the fluids again.
Old 08-23-2007, 10:05 PM
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well, this setup is supposed to fit the MS3 with about .080/.070" clearance.

hmm...

i was thinking about the flycutting, but i just finished this a little over a month ago.
well, i guess i don't mind especially if i get what i want.
Old 08-23-2007, 10:27 PM
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Originally Posted by Irocss85
patrick thinks that cam will clear? I'd be curious to see the clearance #s when you check. post them up for those heads/what gasket/and that cam.

chris
I'm going with the GM MLS gasket. I believe it is a .054 thick. I told him I don't want to flycut and I wanted safe PTV.
Old 08-23-2007, 10:47 PM
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Originally Posted by Irocss85
how much is what you gotta find out by measuring. then rechecking once your cut is done.
I think you can reuse cometics, they say you can. I have never done it though.
yes new head bolts if you have GM head bolts and all the fluids again.
by this, you mean, i put the heads on, tighten enough, and turn? or...
is there a "standard" amount to cut so you can have a good start, as opposed to cut a little, then check however one checks, then cut,....makes sense?

as i write this, i am convincing myself of this.

like you said, after all this time and money...
Old 08-30-2007, 02:07 AM
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ok, it's happening!
flycutting, milling heads to 60cc to increase my SCR to 11.63 or so, going with the 236/240 cam.
i would like to keep the stock gears. can i get away with it? or will i need to change them?
will i loose a lot in the lower rpms? or just a little.

thanks,
Old 08-30-2007, 06:41 AM
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they will be OK, but not ideal. with those skinny sidewall tires though, will prolly help keep traction over lower gears (as in higher number gears). badass. cant wait to hear some #s.
Old 08-30-2007, 12:52 PM
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thanks, Iroc!

i know i did a whole lot of research for the HT, and felt initially i was really pushing the envelope by going with it...though am very happy with it, i want more.
Old 09-13-2007, 05:48 PM
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well, i got to cam in today after its delivery was "rescheduled".
installed it, and put some things together. then, decided to check PTV.

also, i took the heads to the shop to get milled at angle, so they are now 59cc.

i am not 100% sure, but-

exh. ~.160"
int. ~. 50"

i am tired now, but will check it all over again tomorrow.

i am hoping my measurements on the intake are wrong, but, don't think so.

will have to flycut just the intake.

i turned the engine a handful of times, it seemed fine.

Iroc - your thoughts?

Last edited by jegten; 09-13-2007 at 06:06 PM.
Old 09-13-2007, 10:46 PM
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yep, if that is accurate, def. have to cut the intake. you did the dial indicator method as described right? and you tested in multiple places right? as in, 10btdc, 7btdc, 4btdc, 2btdc, 2atdc, 5atdc, I think the one I did had the tightest place at 2 or 4 after top dead center. but every cam will be a bit different. so need to test.

oh, and the exh. looks too much clearance to be accurate. I could be wrong, but check it again at multipule places jut to be sure. if you dont have a dial indicator (thought you said earlier you do?) you can just mark the damper, make a pointer to to mark, and start turning little bit at a time, then test, turn, test, turn test turn test......... all the way around
Old 09-14-2007, 01:22 AM
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thanks, iroc,

i did not really do that many places. actually, i was not able to find the instructions to use the dial indicator. and yes, i do have one.

yeah, i did think that exh. was a little too much, but, it is more than .120".
thanks for the instructions with the damper. i understand. but...the "test" part of it, not quite.



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