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Old Mar 11, 2018 | 05:05 PM
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Default Zl1 427
I am starting new 427 (yes, standard bore) build with a new ZL1 block and L88 replacement heads. Any body out there having luck with pump premium at 11.0:1?
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Old Mar 11, 2018 | 06:57 PM
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Originally Posted by bjerdin
I am starting new 427 (yes, standard bore) build with a new ZL1 block and L88 replacement heads. Any body out there having luck with pump premium at 11.0:1?

going to depend on cam timing and your dynamic compression ratio
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Old Mar 11, 2018 | 08:23 PM
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pay 5-10 bux morea the pump and get some real heads/cam

Really?
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Old Mar 11, 2018 | 11:28 PM
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My 555" was 11.6 with iron block and aluminum heads. Did fine on 93 octane. Real tight quench and tuned. 266#@.050 cam.

My 427 was 11.2 with iron heads..also did fine. 244*@.050 cam.

Keep it cool and tuned.

JIM
Last edited by 427Hotrod; Mar 11, 2018 at 11:28 PM.
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Old Mar 12, 2018 | 03:12 AM
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I run pump premium with 10.5 and iron heads. Shouldn't be a problem with 11.0 and aluminum heads.
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Old Mar 12, 2018 | 11:01 AM
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Originally Posted by 427Hotrod
My 555" was 11.6 with iron block and aluminum heads. Did fine on 93 octane. Real tight quench and tuned. 266#@.050 cam.

My 427 was 11.2 with iron heads..also did fine. 244*@.050 cam.

Keep it cool and tuned.

JIM
Thanks Jim,
Warmed block to 200f and found deck grew .015. Will make pistons to be .008 above cold. Should hold quench below .050.
To cuisinart: Really
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Old Mar 12, 2018 | 11:05 AM
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"Pump Premium" has different octane depending on what part of the country. Do you have 93 octane available?
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Old Mar 12, 2018 | 11:09 AM
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Originally Posted by MelWff
"Pump Premium" has different octane depending on what part of the country. Do you have 93 octane available?
You`re right Mel, I am in Califruity and have 91 but have access to LL100 Av to boost.. Also use a little tolulene from time to time. thx/bj
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Old Mar 13, 2018 | 01:40 AM
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Is this block is what you bought?

https://www.summitracing.com/parts/NAL-12370850/
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Old Mar 13, 2018 | 10:54 AM
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Originally Posted by gkull
Is this block is what you bought?

https://www.summitracing.com/parts/NAL-12370850/
Yes.
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Old Mar 13, 2018 | 01:41 PM
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My 427 has 11.7 C/R. Aluminum heads and adequate roller cam. It runs nice on our local 91 Super.
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Old Mar 13, 2018 | 06:27 PM
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Originally Posted by gkull
My 427 has 11.7 C/R. Aluminum heads and adequate roller cam. It runs nice on our local 91 Super.
Thank you for the input
bj
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Old Mar 13, 2018 | 06:54 PM
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My first roller cam was a comp cams extreme 242/248. 830 carb on a single plane

second cam was a custom comp cams 4/7 firing order swap 252/256. Using lobes from the lobe profile pages. It is a solid roller with. 685/714 lift 110 LC
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