Preformance build for 360
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Joined: Dec 2003
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Hey guys thanks for all the info. I just got a 390 free from a friend of mine, and the best part is it runs. Iam lookin to run either 9.5:1 or 10.0:1 compression, preformer RPM intake. Iam not sure on the cam yet, Ive been lookin at the preformer RPM 236@.050" and .572lift. The stock heads will probly be used(unless I find some money layin around) after they are ported, the block will be .030 over, MSD ignition, carb likely to be 650cfm holley double pumper, any other thoughts yall have would be great.
Post Fiend
Joined: Feb 2001
Posts: 6,624
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From: Missouri
WElcome to FTE I2KLEVR4U!
Take a look at the cam I plan on running next. Its on www.lazercams.com in the hydraulic FE section. It's the one with 290/295 duration.
Take a look at the cam I plan on running next. Its on www.lazercams.com in the hydraulic FE section. It's the one with 290/295 duration.
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Joined: Jul 2002
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From: Long Island USA
Originally posted by Ratsmoker
WElcome to FTE I2KLEVR4U!
Take a look at the cam I plan on running next. Its on www.lazercams.com in the hydraulic FE section. It's the one with 290/295 duration.
WElcome to FTE I2KLEVR4U!
Take a look at the cam I plan on running next. Its on www.lazercams.com in the hydraulic FE section. It's the one with 290/295 duration.
Post Fiend
Joined: Feb 2001
Posts: 6,624
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From: Missouri
I don't base that on valve size. In order to run a single pattern cam (the ideal cam to run) you should have 75% of the intake flow on the exhaust.
The edelbrock heads in stock form are 74% (270cfm intake and 200cfm exhaust). The C8AE-H heads are at 68% (207cfm intake and 147cfm exhaust). This is the reason a dual pattern cam works better with stock heads.
I don't think the ratio changes much on stock heads by just installing CJ vavles. It just makes the flow numbers bigger.
The edelbrock heads in stock form are 74% (270cfm intake and 200cfm exhaust). The C8AE-H heads are at 68% (207cfm intake and 147cfm exhaust). This is the reason a dual pattern cam works better with stock heads.
I don't think the ratio changes much on stock heads by just installing CJ vavles. It just makes the flow numbers bigger.
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From: Long Island USA
Originally posted by Ratsmoker
I don't think the ratio changes much on stock heads by just installing CJ vavles. It just makes the flow numbers bigger.
I don't think the ratio changes much on stock heads by just installing CJ vavles. It just makes the flow numbers bigger.
The reason I ask is I have a set of C8AE heads done up with CJ exhaust valves and heavy porting, and a 292/292 (230/230@.050"), .554/.554" cam - while I have no idea if it could have been better, I have great low-end (but lopey idle), mostly I think because of less overlap, because of the shorter exhaust duration.
Quite a punch in the exhaust note, that's for sure.
Just curious...
thanks!
art k.
Post Fiend
Joined: Feb 2001
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From: Missouri
The stock 390 size was 2.03 X 1.55. The CJ was 2.09 X 1.66. If you have heavy porting on the exhaust side then you are probably running a very good cam for your setup. I'll bet that is pretty lopey!
FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
Originally posted by Ratsmoker
The stock 390 size was 2.03 X 1.55. The CJ was 2.09 X 1.66. If you have heavy porting on the exhaust side then you are probably running a very good cam for your setup. I'll bet that is pretty lopey!
The stock 390 size was 2.03 X 1.55. The CJ was 2.09 X 1.66. If you have heavy porting on the exhaust side then you are probably running a very good cam for your setup. I'll bet that is pretty lopey!
11 inches of vacuum at 900-1000RPM with almost 20 degrees advance? Yeah, pretty lopey
The multi-spark MSD helped a LOT. Didn't help the vacuum though
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From: Long Island USA
Originally posted by Janimal
I'm wondering how much gas a beast like that would drink?
I'm wondering how much gas a beast like that would drink?
I noticed it was quite a bit better than my stock 360 with a 2bbl, which was lucky to get 10MPG on the highway, so I'm putting my current 390 at around 15MPG. Quite a difference.
Senior User
Joined: Mar 2004
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From: Tankville
360 would be a good hard-rever if there were some beefier 360 rods availible... The longer rods seem to bend/get loose after lots of 5000+rpm shifts. 390 rods are tough right out of the box, I'm creeping up on 25 000 miles and no rods have flown outta my 390 yet... The last 360 I had gave out after 4500miles of leadfoot treatment.
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From: Long Island USA
I had a totally stock 360 that regularly saw 6000RPM and never threw a rod. (side note: this 360 is the same one that had an externally balanced crank - so the crank sounds like a 361 FT, which means my rods may have been beefier than they should have been).
Granted, it was totally stock - if you're pushing more power out of it, the stock rods DO look sorty wimpy...
art k.
Granted, it was totally stock - if you're pushing more power out of it, the stock rods DO look sorty wimpy...
art k.
Post Fiend
Joined: Jan 2003
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From: Iowa
I think the long rods would be perfectly ok if ARP bolts were used in 'em.
I've got this crazy 360 idea stuck in the back of my head. It involves the Crane 349521 roller cam, beefed up valve train, custom forged flat top pistons (for less deck clearance, about 1.85" compression height), and about 9.8:1 compression. The heads would be ported with CJ valves, and it'd use a single plane intake. Desktop Dyno shows over 500hp.
Part of my interest in the 360 is that there are SO many of them up at the junkyard for almost nothing in terms of price.
I've got this crazy 360 idea stuck in the back of my head. It involves the Crane 349521 roller cam, beefed up valve train, custom forged flat top pistons (for less deck clearance, about 1.85" compression height), and about 9.8:1 compression. The heads would be ported with CJ valves, and it'd use a single plane intake. Desktop Dyno shows over 500hp.
Part of my interest in the 360 is that there are SO many of them up at the junkyard for almost nothing in terms of price.
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From: Long Island USA
Originally posted by rusty70f100
Part of my interest in the 360 is that there are SO many of them up at the junkyard for almost nothing in terms of price.
Part of my interest in the 360 is that there are SO many of them up at the junkyard for almost nothing in terms of price.
Are the rods really different length? I was told they were all the same length, but strength varied. But, I may be mistaken and I'm thinking of something else.
Post Fiend
Joined: Jan 2003
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From: Iowa
I am doing a 390 with the Crane 343941 cam, Edelbrock performer RPM intake, and ported heads. Ongoing project. It's just that this 360 idea keeps sitting in the back of my head. If I had the resources to build these 360's up into crate engines and sell them for profit, I think the profit margin would be high.
I just got a spare parts 360 for $35. That gives you an idea of how many this guy has. He has only one 390 that I know of, and that's in an F-250.
And yes, the rods are different lengths. 2 lengths are used on FE's. 6.54" for the long rods, 6.488" for the short rods.
I just got a spare parts 360 for $35. That gives you an idea of how many this guy has. He has only one 390 that I know of, and that's in an F-250.
And yes, the rods are different lengths. 2 lengths are used on FE's. 6.54" for the long rods, 6.488" for the short rods.