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Will this combo run on 91?

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Dave De
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Will this combo run on 91? Empty Will this combo run on 91?

Post  Muddy557 August 30th 2022, 10:38 am

Will this combo run on 91? 83c75f10
Will this combo run on 91? B7d74010

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Post  Dave De August 30th 2022, 4:08 pm

Yes in a vehicle less than 4,000 pounds but 93 would be more safe and may allow 38 degrees total timing that those heads will like over your stated 35 degrees.
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Post  rmcomprandy August 30th 2022, 7:31 pm

Muddy557 wrote:Will this combo run on 91? 83c75f10
Will this combo run on 91? B7d74010

Be sure to keep the engine temperature on the low side ... 160 degrees; 180 degrees max.

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Post  BBFTorino August 31st 2022, 4:10 pm

What size is this motor? 557?

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Post  Dave De August 31st 2022, 8:28 pm

BBFTorino wrote:What size is this motor? 557?

Pistons show 3.85" stroke
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Post  Muddy557 August 31st 2022, 9:20 pm

.040 over 460, roughly a 468
BBFTorino wrote:What size is this motor? 557?

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Post  droppedf100 September 1st 2022, 10:40 pm

I have a very similar combo to you. My d0ve heads are milled down to 66cc so compression should be similar and my cam is 251/260 .606-.632 108ls solid flat tappet. My trucks 4100lbs and I run it on 93 with 40* timing
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Post  Muddy557 September 2nd 2022, 4:11 pm

Thanks for the replies guys , does anyone have a rough guess what the comp ratio would be with a set of d3’s instead of the doves ?

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Post  supervel45 September 2nd 2022, 4:55 pm

8.48/1 assuming 95cc on the D3's

http://www.wallaceracing.com/cr_test2.php

I started with your claimed 10.125/1 compression and only changed the head cc's.

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