LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

head/cam matching

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Old Jul 7, 2013 | 07:23 PM
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head/cam matching

Ok guys 95 z28 blown head gasket...

have to do gaskets and figured while im at it how about doing some head work and doing a cam.

Im very expierenced in doing head work. So im going to port my factory heads to flow better. However that is pointless without a matching cam....

Im looking at the lt4 hot cam kit with rockers springs and all.

Will it match up fine and will I require tuning on the ecu immediately after install. Any vacuum problems ECT.

Car will have intake, 52mm tb, shorty headers, ypipe and cat back, ported intake manifold.
also 30lb injectors worth it with that set up?

I will be doing a tune but wil have to travel almost 2 hours to tune car. Would rather drive it then tow it!

Any help or suggestions would be awesome

Thank you guys
Old Jul 7, 2013 | 11:20 PM
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KW Baraka's Avatar
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Re: head/cam matching

Originally Posted by 1FST4GEN
.......So im going to port my factory heads to flow better. However that is pointless without a matching cam....

Im looking at the lt4 hot cam kit with rockers springs and all.

Will it match up fine and will I require tuning on the ecu......
Well.....if you're gonna do a Hot cam (there are better choices, BTW), you will have to get the PCM recalibrated.....the sooner the better. You'll be about to drive the car there.

As far as how the Hot cam will match your heads......no idea. I mean, you've given no indication on what spec's your self-ported heads will come out to; so there's no way to know what cam(s) will or won't match the heads.

KW
Old Jul 7, 2013 | 11:36 PM
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Re: head/cam matching

What cams would you suggest that are better?

Headflow im not sure of yet as im nee to lt1 platform but let's says a 15% increase.......

I don't want to have to have my pcm tuned immediately. Would rather do mail order if possible so to get me by so i don't have to drive 200 miles untuned


Please put your input good or bad as im trying to learn and read!!
Old Jul 8, 2013 | 01:48 AM
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If you get the cable and the software to tune and to log car I would bet email tunes could get you pretty close and definately safe for "normal" driving. Might even save some time on the dyno plus then you have the means to change your tune and log data.


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Old Jul 8, 2013 | 06:51 AM
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Re: head/cam matching

Truthfully if you're admittedly new to the LT1 platform I would do one of these two things.

1.) Find a junk set of LT1 heads to practice on first. There is a VERY good chance you'll end up with worse-performing heads than the stock ones. Contrary to popular belief the stock heads really aren't that bad, especially for what you're looking for judging by your cam selection.

2.) Let the pros handle it. AI (Advanced Induction Cylinder Head Development) will port your heads and match a cam to them for you. You'd end up with close to 400whp. LE will also give you a package deal too.
Old Jul 8, 2013 | 10:27 AM
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Re: head/cam matching

I want a nice torque cam! will be street driven but also taken to drag strip :-)

I will def. Take your advice and get a set of junk heads to make my first go around with.
mainly will just gasket match them and the intake since im new to platform.

Please suggest a cam for me that would work with what I want.

Thank you for help so far!


As far as tuning mail order ok but I personally do not want to get into only myself. Im old school lol grew up on carburators and big block fords. Not very computer savvy lol
Old Jul 8, 2013 | 10:38 AM
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Re: head/cam matching

Before you pick up a set of heads do some more reading. Gasket-matching is NOT the correct way to port heads. The intricacies involved are pretty mind-boggling to actually get good results.

For PCM tuning you can have it done on an exchange basis with several of the big programmers (PCMforless.com, etc.). Really though loading the tune yourself is much easier and preferred nowadays.
Old Jul 8, 2013 | 11:00 AM
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Re: head/cam matching

So what's the best cam for a stock head? I don't have the funds to spend 1000+ on heads right now and from what say its not worth it to try and port these when idk the proper way these heads require.

I want a cam that will work with stock heads and yet come even more alive when I go to larger heads down road.

That's why I was looking into the hot cam but yall say there are better ones. Please inform me
Old Jul 8, 2013 | 11:34 AM
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Re: head/cam matching

Originally Posted by 1FST4GEN
So what's the best cam for a stock head.......I want a cam that will work with stock heads and yet come even more alive when I go to larger heads down road.....
There's a saying.....
'you can have *something* done;
quick;
or right;
or cheap.'

But you can only have two of the three.....because all three ain't gonna happen.

Cams are pretty much the same thing.

You can have a strong performing cam with stock heads.....or.....you can have a strong performing cam with ported heads.....but you can't have both. The most you can expect from a 'multi-purpose' or 'compromise' cam is 'OK' performance (IMHO).

A Hot cam will perform 'OK' with both.....but as mentioned; there are cams that will perform better than the HOT cam with stock heads.....and there are other cams that will perform better than the HOT cam with ported heads.

If you really want a 'safe' cam for stock & ported heads....then get the Hot cam.

But you'll still want to get a fresh set of valve springs with the swap.....and you will need to eventually get a tune to optimize performance. Driving it 200 miles to get a tune in person will NOT pose a problem.

KW
Old Jul 8, 2013 | 03:02 PM
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Re: head/cam matching

Thank you kw!

Injectors.... Worth it to put 30# on or leave stock?

what is a guess on hp numbers with the hot cam 1.6rr and all bolt ons?
Old Jul 8, 2013 | 03:42 PM
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Re: head/cam matching

Put the 30Lb. injectors in just before you have tuned.
Old Jul 8, 2013 | 04:05 PM
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Re: head/cam matching

Take a look at this package Lloyd offers.
LT1 LE1 «
Old Jul 8, 2013 | 05:45 PM
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Re: head/cam matching

Originally Posted by 1FST4GEN
Thank you kw!

Injectors.... Worth it to put 30# on or leave stock?

what is a guess on hp numbers with the hot cam 1.6rr and all bolt ons?
Hotcam cars put down on average 320-330whp. A more aggressive cam-only setup like the AI 226/234 has put down 350+. The hotcam is tried and true mostly for its simplicity. Outside of that though it's an old dog.

If you're staying cam-only there's no reason to spend money on bigger injectors. Just about any (reasonable) cam you put in can be handled by the stock 24#s.
Old Jul 8, 2013 | 05:47 PM
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If it were me I would contact Loyd Elliot or AI and talk to them. Loyd has posted several tips on porting in various forums and he could probably sway you in a good direction as well as offer up a cam that could go well for your goals. Given you did port a set of heads he might be willing to take a look at them and finish them or something like that for the right price and arrangement. As I said before if you get the cable and software then tuning by email is an option and you can present data back to the tuner and they can get your tune closer. It is much better than just an initial tune with no corrections made by data logs. It also gives the ability to switch between tunes(like for injector sizes)My point is you dont have to learn the tuning end of it for the flashing hardware- software to be handy to have(saves you from shipping the pcm off for changes and opens up options to keep fine tuning the tune and to make changes like for gears or tire size or fan turn on temps or to disable various things).


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Old Jul 8, 2013 | 06:28 PM
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Re: head/cam matching

Ai cam? Please send me in right direction for that.

I like the le1 kit but also want something more aggressive but also still pass smog.... Possible? Lol



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