e street, rpm or ported 452
#2914992
04/25/21 11:40 PM
04/25/21 11:40 PM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
NTOLERANCE
OP
master
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OP
master
Joined: Aug 2003
Posts: 4,384
Madison Wi
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Heres my set up ....which heads would you run?
3400 65 b body 383. Stock bottom end. 1970 short block ultra low mileage. Zero ridge factory cross hatch still in place. Crower .500 / 290 advertised mech flat tapped lifter Tunnel ram with 450 holleys Hooker comp headers. 3inch exhaust. Summit flow master knock offs Crane iron rockers Mallory unilite dist. 143 tooth flywheel. 23 spline 833 with liberty pro shift gears Dana 60. 4.10 power lock. Mini tubbed. 325/50-15 tires
Currently have ported 452's in the shop. 2.14 / 1.81 valves. Have a local guy with a set of e street and a set of rpm eddy heads. Both 75 cc chambers. Prices are reasonable. Compression ratio figured in my head: 452s have been surfaced. Steel shim head gasket 452 heads 9:1 Eddy heads 9.75:1
With those compression numbers i think my cam is too big but then again i have seen worse run well. Crower recommended 9.2:1 Not moving away from solid lifters.....and this is the short block I have ready so I'm sticking with that.
Thinking the 75 cc chambers will help..... I could mill my 452s down.
Which heads would you choose? Rpm ports too big for a 383?
Im unlikely to go smaller in camshaft. In fact i have two larger ones on the shelf. Next one up is an stx19 racer brown mech flat tappet.
Which heads would you use or please feel free to correct my combo.
Its a street/strip car.....i don't plan to rack up miles and miles cruising.
I used to care but....... things have changed
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Re: e street, rpm or ported 452
[Re: NTOLERANCE]
#2914999
04/26/21 12:25 AM
04/26/21 12:25 AM
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Joined: Jul 2008
Posts: 30,460 Florida STAYcation
dOOc
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,460
Florida STAYcation
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I’ve been away from a major engine rebuild for awhile.... But one thing I know is QUENCH.... And you can’t get that with 452s Closed chambered alum heads please
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Re: e street, rpm or ported 452
[Re: NTOLERANCE]
#2915010
04/26/21 02:24 AM
04/26/21 02:24 AM
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Joined: Aug 2003
Posts: 43,251 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,251
Bend,OR USA
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All the fast 383 motors I've seen, built and help race had to be revved up(above 7000 RPM ) to go fast Post the duration at .050 lobe lift, lobe separation angle and the actual lobe lift please on all the cams you have that you want to use As far as my choice based on heads I have used I would choose the Eddy RPMs only
Last edited by Cab_Burge; 04/26/21 02:25 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: e street, rpm or ported 452
[Re: Moparteacher]
#2915338
04/26/21 05:20 PM
04/26/21 05:20 PM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
mopar
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mopar
Joined: Mar 2008
Posts: 553
Kentucky
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How fast are you wanting to go? Are you going to run pump gas?
If it is factory 383 short block there is a good chance that the pistons are in the hole at least .030, so closed chamber or not quench wiil be difficult.
Last edited by clovis; 04/27/21 03:23 PM.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: e street, rpm or ported 452
[Re: clovis]
#2915341
04/26/21 05:31 PM
04/26/21 05:31 PM
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Joined: Jun 2014
Posts: 3,216 Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,216
Md.
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If I'm not mistaken the E streets and rpm's are the same head. I'll bet they still outflow the 452's ootb. What is reasonably priced if you don't mind me asking?
America First!
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Re: e street, rpm or ported 452
[Re: NTOLERANCE]
#2915894
04/27/21 09:11 PM
04/27/21 09:11 PM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
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Madison Wi
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Thanks for the replies. I have been trying to find my cam specs online since I'm travelling but i will have to find them when i return home.
I can buy like new rpms for about $1000. E streets for less.
I used to care but....... things have changed
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Re: e street, rpm or ported 452
[Re: NTOLERANCE]
#2916323
04/28/21 10:04 PM
04/28/21 10:04 PM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
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Stx19m cam specs attached.
The crower is grind 32001. .500 lift with 1.5 arm. Advertised duration 300 254 degrees at .050. Lobe separation 105
I do have a crane cc280 as well. Cannot find the specs on it.
I cannot find my depth mix to measure the piston height
Im not opposed to decking the block.
I used to care but....... things have changed
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Re: e street, rpm or ported 452
[Re: NTOLERANCE]
#2916370
04/29/21 12:54 AM
04/29/21 12:54 AM
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Joined: Aug 2003
Posts: 43,251 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,251
Bend,OR USA
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Those valve spring pressures are way lower than I would use I'm thinking 140 Lb. to 160 Lb. on the seats and 350 Lb.to 380 Lb. over the nose I would want more lift for those duration also I use to use the original Racer Brown for cams in my motors, I did buy and use both the STX20 and STX 21 cams, I wasn't smart enough to record and keep those cam specs though I think the STX22 and STX 23 grinds were consider to be SS grinds and to be used on roller cams mainly
Last edited by Cab_Burge; 04/29/21 12:56 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: e street, rpm or ported 452
[Re: Cab_Burge]
#2916372
04/29/21 01:11 AM
04/29/21 01:11 AM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
NTOLERANCE
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OP
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Madison Wi
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Those valve spring pressures are way lower than I would use I'm thinking 140 Lb. to 160 Lb. on the seats and 350 Lb.to 380 Lb. over the nose I would want more lift for those duration also I use to use the original Racer Brown for cams in my motors, I did buy and use both the STX20 and STX 21 cams, I wasn't smart enough to record and keep those cam specs though I think the STX22 and STX 23 grinds were consider to be SS grinds and to be used on roller cams mainly That cam came from AndyF. I'm assuming that's his writing on the box. I have three different sets of valve springs. I don't recall the specifics on each but one set should work. Not sure i can run more lift. Ill have to clay it up. Im going to get the rpm heads. Still would like for opinions on this build.
I used to care but....... things have changed
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Re: e street, rpm or ported 452
[Re: NTOLERANCE]
#2916519
04/29/21 12:29 PM
04/29/21 12:29 PM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
top fuel
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top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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To me this is a no brainer! Get the rpm heads. Heads are not by any means too big. Fwiw I had a 383 12.5 to 1 with ported 915s and a 590 cam. It liked rpm but one day at the track a wise man told me he bet I would run the same numbers shifting at 6k. He was correct. With rpm heads I think it’s as good a combo as you’re going to get with what you have. Good luck 👍 With 9.75 to 1 I don’t think your cam is too big but I would not go any bigger. If you stay with 452 and 9 to 1 I would agree it’s too large.
Last edited by viperblue72; 04/29/21 12:31 PM.
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