How do I biuld a '70 Z-28 engine - Team Camaro Tech
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post #1 of 26 (permalink) Old Aug 22nd, 03, 10:08 AM Thread Starter
 
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what parts do need to build a '70 Z engine ? I am not going to make a clone i just need to stay within certain parameters for SCCA ESP competition and am limited to all STOCK parts for engine...
i can change intake, carb, and exhaust....
and where would i get the heads, cam, etc. (what are the specs, if anyone has them)
i am thinking around 7000 - 7500 RPM range for the engine... does this sound doable ?
thank you in advance
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post #2 of 26 (permalink) Old Aug 22nd, 03, 07:10 PM
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The 70 Z-28 would be the engine I have in mine. The mighty LT-1 350 stock 370hp the highest hp small block ever produced in quanity. I can't help you with all the specs though. Mine came from the factory with bigger cam and 11:1 h/d pistons. I ordered the short block that way. I love the power!!

[img]graemlins/thumbsup.gif[/img]

1967 Camaro coupe Deluxe interior LT-1 350 w/ 4spd. M-21 trans and 12 bolt rear.


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post #3 of 26 (permalink) Old Aug 23rd, 03, 02:42 AM
 
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I'm not positive on this but you might be able to get the heads from a Chevy dealer. As for the cam, many aftermarket cam manufacturers have stock cam replacements that qualify in NHRA and IHRA as having the stock cam dimentions but are much more powerful that the original stock Chevy cam. You will have to check with SCCA to see if they will be OK with them.
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post #4 of 26 (permalink) Old Aug 23rd, 03, 06:35 AM
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http://www.nastyz28.com/camaro/camaro70.html#70-z28
Here's part of it.
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post #5 of 26 (permalink) Old Aug 23rd, 03, 12:43 PM Thread Starter
 
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does the RPM range sound about right ? at 7000 - 7500 will it still pull or will it die out at 6000 RPM ?
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post #6 of 26 (permalink) Old Aug 23rd, 03, 06:10 PM
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I have no problem revving over 8000 rpm. [img]graemlins/thumbsup.gif[/img]

1967 Camaro coupe Deluxe interior LT-1 350 w/ 4spd. M-21 trans and 12 bolt rear.


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post #7 of 26 (permalink) Old Aug 23rd, 03, 08:25 PM
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Cam
http://www.sdpc2000.com/cart.asp?act...d=989&pid=1262

Lift here is measured after lash is taken up. Some sources say .459/.485 (lash is .024/.030), but it all works out the same.
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post #8 of 26 (permalink) Old Aug 23rd, 03, 08:50 PM
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That is the correct cam listed above. However, don't order the cam and lifters seperately. Look at their kit prices...the same cam with lifters is like an extra $8. I ordered a -140 mechanical cam and lifter set for $120 from them. Great company to deal with.
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post #9 of 26 (permalink) Old Aug 24th, 03, 02:09 PM Thread Starter
 
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RamJam... 8000 RPM ??? intrigued.. tell me more... is it still accelerating ? still pulling ? do you have a dyno sheet for it? did you order a bigger cam than the LT-1 cam ???
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post #10 of 26 (permalink) Old Aug 24th, 03, 08:35 PM
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Lateral,

Yes, Yes, No sheet, Yes I did, I don't remember duration and lift sorry, but I can tell you it's a 375 hp cam. Anymore question ask away.

[img]graemlins/thumbsup.gif[/img]

1967 Camaro coupe Deluxe interior LT-1 350 w/ 4spd. M-21 trans and 12 bolt rear.


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post #11 of 26 (permalink) Old Aug 25th, 03, 02:04 AM
 
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Yes, the 370/hp mule 350 motor had the old -346 or better known as the "30-30" solid cam in it!

Spec'ed at something like 314/254, (even though GM called it 346!), 114/110, .455" at .030" lash

The motor they sold with the automatic has the -178 cam in it which is really the 360hp/cam if not mistaken...

Spec'ed thereabouts like 316/336, 242/254, 116/110, 439"/460" at .020" and .025" lash.

As for the -140 solid cam, it is something like 323/329, 257/269, 112/108, .469"/.486" at .024" and .026" lash.

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post #12 of 26 (permalink) Old Aug 25th, 03, 03:33 AM
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I think about 6500 would about tops for the motor in stock configuration (what's factory redline? 5800?). The heads would be the limiting factor IMO - I won't comment on taking the motor to 8,000

Not sure what cylinder head castings the motor would have but I'm pretty sure they would be the double hump heads with 160-170cc intake ports. They're not available new, but there's usually a few sets on eBay --- but buyer beware, these old heads were highly desired for 70's and early 80's race cars before the aftermarket jumped in there so its hard to find a set that isn't all used up. They are expensive to rebuild - especially if they need valve guides and hardened valve seats installed.

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post #13 of 26 (permalink) Old Aug 25th, 03, 03:58 PM
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The 327/375 SHP Vette F.I. cam WILL rev that high in stock configuration. We know that cam here as the "30-30" cam from the Z/28 - Same part. Stock valve train, no screw in studs, no oversize dual valve springs, no NOTHIN! and we still can get 8000 RPM out of it. Not too bad for a stocker [img]smile.gif[/img]

I am running one myself. I would not take it that high very often as it is hard on valve springs. That would be a good justification for some oversize dual valve springs, screw in studs and guideplates IMHO if you were to rev it that high on a regular basis. If it stops wanting to go that high, it's probably time for new springs. [img]smile.gif[/img] Perfect application for some of those Crane H-11 VascoJet tool steel valve springs if you were afraid to modify your heads.

I doubt the 1970 -178 LT-1 cam will rev that high and I know it would be down on power over 6000 RPM as compared to the "30-30". The lift ramp speeds are a bit higher on the -178 so valve float is more likely.

Rev on!

-Mark.
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post #14 of 26 (permalink) Old Aug 25th, 03, 06:44 PM
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Eric,
What does this mean are you saying you don't believe me? I have no reason to come on here and bulls$$$ anyone. I'm stating the truth.

I never said I do it constantly, I said "I have no problem revving over 8000 rpm". I'm running 4.56 gears so that definately helps and I also have 202 camelback heads. It all works good together.

1967 Camaro coupe Deluxe interior LT-1 350 w/ 4spd. M-21 trans and 12 bolt rear.


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post #15 of 26 (permalink) Old Aug 26th, 03, 08:21 AM
 
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Ram,

Eric's OK...

I think he is saying that even though you can go to 8 grand and above, that it isn't worth it in parts life shortening!

I do know that the '69 Z- car my B-i-l was going to buy off the bank had it's valves bent b/c somebody probably took it out for a test spin and missed a shift AND kissed the valves!!

I do know that the little bitty, -097 Duntov solid cam that I ran in my junk 301 with only small valved heads AND Z-28 springs would wrap until the points would cut out! And I mean above 7,000 easy!!

Heck, I really beat on the little junk bugger when she got loaded up with oil fouled plugs!!!

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