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Re: 440 Cam
[Re: d-150]
#1162460
01/23/12 11:26 PM
01/23/12 11:26 PM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
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San Antonio, TX
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Yeah I agree with the both of you. When I looked at the rpm range on both the ones recommended, they are definately higher than what I want to be using on the street.
The only thing that has looked good are cams with a 224-228 duration at .050 with an exhaust duration of like 240-245 to help compensate with the manifolds. Specifically Hughes whiplash cam but that is designed for low compression stock engines.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: 440 Cam
[Re: CurYellowBird]
#1162461
01/24/12 01:11 AM
01/24/12 01:11 AM
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Joined: Jan 2003
Posts: 75,102
A Banana Republic near you.
JohnRR
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I Win
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Quote:
Without milling the heads, the six pack L2355 pistons put my compression at 10.3-10.6 range with the .020 steel head gasket. Going to go with the felpro .040 to continue to safely run on pump gas.
What are you using for a compression calculator ? I get 9.67 with real world specs since you info is vague in the original post. , first you estimate the 452's at 86-88 and say in this post you will not mill , them , try more like 90-92 actual CC . Are you going to deck the block and what rods are you using , those piston on a stock rod are .020 in the hole of a blueprint deck , which is usually shorter than actual deck according to some . the nthey is your head gasket , .021 is the thinnest steel shim ... not that .001 amounts to much. , how much did you add for the volume of the VALVE RELIEFS in those pistons ???
You should actually measure stuff instead of guessing. And I agree , talk to someone about a cam for your ACTUAL combo ...
you need to CC your
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Re: 440 Cam
[Re: JohnRR]
#1162462
01/24/12 02:03 AM
01/24/12 02:03 AM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
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https://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=7022173&Main=7022049That's the post I started a week ago where quite a few people commented on. Almost everyone was telling me that I'm going to be at 10 to 10.5 CR. The heads are from Indy and they said they milled them to 86-88 cc spec. The pistons are the L2355 replacement pistons with a CH of 2.06. The block is going to be decked for clean up but not zero deck since I want to run on pump gas. Honestly, I don't see what was vague in my original post, other than not listing the compression, figured listing the heads and pistons would be enough.
Last edited by CurYellowBird; 01/24/12 02:09 AM.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: 440 Cam
[Re: CurYellowBird]
#1162463
01/24/12 02:08 AM
01/24/12 02:08 AM
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Joined: Jan 2003
Posts: 75,102
A Banana Republic near you.
JohnRR
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I Win
Joined: Jan 2003
Posts: 75,102
A Banana Republic near you.
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Quote:
https://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=7022173&Main=7022049
That's the post I started a week ago where quite a few people commented on. Almost everyone was telling me that I'm going to be at 10 to 10.5 CR. The heads are from Indy and they said they milled them to 86-88 cc spec. The pistons are the L2355 replacement pistons with a CH of 2.06. The block is going to be decked for clean up but not zero deck since I want to run on pump gas.
The internet is full of people pulling numbers out of their backside.
IF 86 cc you will have 10.01ish , 88 cc LESS. You need to have the block decked to know where your pistons are, CC the heads THEN you can safely determine your compression ratio
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Re: 440 Cam
[Re: JohnRR]
#1162464
01/24/12 02:13 AM
01/24/12 02:13 AM
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Joined: Feb 2009
Posts: 583
San Antonio, TX
CurYellowBird
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Posts: 583
San Antonio, TX
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I'll check tomorrow when I go to the machine shop.
That being the case, that's a lot of people pulling numbers out their backside. Having 88 cc compared to 86cc is only slightly less in compression.
Last edited by CurYellowBird; 01/24/12 02:15 AM.
Project War Bird:
1971 Plymouth Roadrunner
383 4 speed with air conditioning
GY3 Curious yellow
All original
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Re: 440 Cam
[Re: CurYellowBird]
#1162465
01/24/12 02:27 AM
01/24/12 02:27 AM
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Joined: Jan 2003
Posts: 75,102
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,102
A Banana Republic near you.
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Quote:
I'll check tomorrow when I go to the machine shop.
That being the case, that's a lot of people pulling numbers out their backside. Having 88 cc compared to 86cc is only slightly less in compression.
I don't see a lot of people pulling numbers out of their backside in that thread. EXACTLY one person quoted "10.6 give or take .1" and that was after you said you were going to use a head with a 78cc chamber .
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