Engine suggestions....taking out the original dz 302 - Team Camaro Tech
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post #1 of 37 (permalink) Old Jun 18th, 15, 07:15 PM Thread Starter
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Engine suggestions....taking out the original dz 302

Hi all,
I wanted to take out my original dz 302 from my 69 z28 for safe keeping and replace it with another sbc engine. The only thing stipulation is that it looks like the original dz motor (hump heads, winters intake, mechanical fuel pump,etc). This car will not be raced but just for spirited driving, cruise nights, and car shows. I know I can have dart iron heads altered to have the double humps but other than that I'm open to engine suggestions. I do have (2) 140 offroad cams laying around to use but don't have to use them in the replacement motor.
Thanks
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post #2 of 37 (permalink) Old Jun 18th, 15, 07:38 PM
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Smile Re: Engine suggestions....taking out the original dz 302

Well in my opinion, you are limiting yourself to a 350 cid with those heads.

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post #3 of 37 (permalink) Old Jun 18th, 15, 08:09 PM
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Re: Engine suggestions....taking out the original dz 302

Why not keep the 302 in it and enjoy it for what it is.

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post #4 of 37 (permalink) Old Jun 19th, 15, 12:06 AM Thread Starter
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I was hoping using the dart heads might have given me more options.
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post #5 of 37 (permalink) Old Jun 19th, 15, 12:07 AM Thread Starter
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I'm too paranoid to use the 302 as it was designed
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post #6 of 37 (permalink) Old Jun 19th, 15, 01:18 AM
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Smile Re: Engine suggestions....taking out the original dz 302

Yes, with different heads ( just paint them orange like the block) you could build a very nice 383 !

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post #7 of 37 (permalink) Old Jun 19th, 15, 04:20 AM
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Re: Engine suggestions....taking out the original dz 302

You could still make a 383, you just need to dish the pistons to keep the CR down when using the 186 heads. Get an internally balanced kit and an older large pad block and you would not notice the difference. Of course power would not be the best it could be when using the heads and factory exhaust manifolds. But it would have more TQ than you have now.

Kevin


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post #8 of 37 (permalink) Old Jun 19th, 15, 04:37 AM
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Re: Engine suggestions....taking out the original dz 302

Quote:
Originally Posted by xxxg00w0pilot View Post
Hi all,
I wanted to take out my original dz 302 from my 69 z28 for safe keeping and replace it with another sbc engine. The only thing stipulation is that it looks like the original dz motor (hump heads, winters intake, mechanical fuel pump,etc). This car will not be raced but just for spirited driving, cruise nights, and car shows. I know I can have dart iron heads altered to have the double humps but other than that I'm open to engine suggestions. I do have (2) 140 offroad cams laying around to use but don't have to use them in the replacement motor.
Thanks
4.125 x 3.25 stroke. Nothing but fun!

Chris

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post #9 of 37 (permalink) Old Jun 19th, 15, 05:03 AM
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Re: Engine suggestions....taking out the original dz 302

I like Chris' idea. The car should have fairly low gearing (if it still has the original rear end), so may as well take advantage of it and build an engine with the same basic stroke/bore ratio as the original.... all while gaining 45 cubic inches over the 302.

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post #10 of 37 (permalink) Old Jun 19th, 15, 05:28 AM
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Re: Engine suggestions....taking out the original dz 302

How about a 350 built to 70 LT1 specs. I did that with my 69 vert and it is awesome!
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post #11 of 37 (permalink) Old Jun 19th, 15, 06:07 AM Thread Starter
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Thanks for the ideas. Car has the original rear end and 3.73 gears. I like the short stroke large bore motors but also like the big cubic inch small blocks but realize the stock heads doesn't flow well.
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post #12 of 37 (permalink) Old Jun 19th, 15, 07:15 AM
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Re: Engine suggestions....taking out the original dz 302

SBC 400 would be my choice. Paint the heads orange correct valve covers etc to keep the original look.

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post #13 of 37 (permalink) Old Jun 19th, 15, 07:35 AM
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Re: Engine suggestions....taking out the original dz 302

SBC 406 with a set of seven rib valve covers with the oiler nibs ground down to clear the short poly lock nuts on top of your roller rockers and a set of AFR heads that have been put in a CNC mill to replicate your existing head's identification casting marks.



I wouldn't even pull and modify your valve covers instead using a set purchased used of line.

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post #14 of 37 (permalink) Old Jun 19th, 15, 07:47 AM
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Cool Re: Engine suggestions....taking out the original dz 302

I really don't understand the thinking that goes on about these cars. You either buy them to enjoy or you put them in a trophy room and never touch them. My thinking is, you only live once so why not enjoy it cause the next guy will after your gone. I know guys who hammer these original cars at The Mid Mich 1/4 mi track for the all stock drags each yr. Get out there and enjoy what you have rather then saving it for the next person. My .02.

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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post #15 of 37 (permalink) Old Jun 19th, 15, 08:06 AM
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Re: Engine suggestions....taking out the original dz 302

When you add stroke you add piston speed. As piston speed goes up so does the demand on intake track and exhaust track. By increasing the stroke to 3.25 and going big bore you will be able to use the induction and exhaust manifolds originally designed for these cars while still maintaining the "Vintage Sleeper Look".

Yes a 383 and 406 are more CID but they require bigger stuff to let them breathe. The short stroke engine will still make power to the rpm where the 3.73 gear wants to go.

If this is a play engine then go 4.185 x 3.25 with a 6.250 Long rod. This will give you a 358CID power plant an I will promise you......more tire smoke than you can shake a stick at!!!!!!

Chris

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