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Dec 17, 2012 | 09:10 PM

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Laughing Gas

Joined: Jun 2010

Posts: 1,056

Likes: 10

From: Indiana, PA

Am I missing anything

Well for my winter project I have decided to tear out and re-build my 390 because it is gutless. So after tearing it down and figuring it out, I have found my motor to be an emissioned up truck motor with 7.92 to 1 compression. In order to build the motor up I am planning to cam it up and increase the compression. I was thinking of getting earlier car pistons which should bring the compression up to 9.47 to 1. Also I am planning to run this cam. COMP Cams Xtreme Energy Cam and Lifter Kits K33-238-4 - SummitRacing.com

I just wanted to know if anybody saw any red flags with my plan before I ordered my parts. Also do you all think I might be going too big with this cam. I have stock port heads with a edelbrock dual plane intake and long tube headers.

Dec 17, 2012 | 10:04 PM

1972RedNeck

Logistics Pro

Joined: Feb 2011

Posts: 3,522

Likes: 11

From: Townsend, MT

You might want to have the rods re-bushed. I assume you are going to install new bearings and rings? Do you already have headers and 4 barrel intake? 360 pistons bring the compression right up too (probably the same piston).

If you want more power get a 428 crank. If you want even more, contact survival motor sports.

Dec 18, 2012 | 07:14 AM

krewat

FTE Leadership Emeritus

Joined: Jul 2002

Posts: 42,561

Likes: 423

From: Long Island USA

Yes, check out 360 pistons - the pin height is different, making the piston sit up higher in the bore, increasing the compression, I think to around the 9.5:1 or maybe 10? can't remember

Dec 18, 2012 | 08:28 AM

69cj

Hotshot

Joined: Jul 2005

Posts: 13,834

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From: Middle Tn.

If you get the 428 crank to make a 410 motor get the 428 cj pistons for 10:6 to 1 comp.

Dec 18, 2012 | 09:39 PM

stromburg

Senior User

Joined: Oct 2012

Posts: 422

Likes: 2

From: Arlington

It looks good to me, I am building the same engine, 390 with 360 pistons [H395P] ,edelbrock performer and try-y headers, also that 33-238-4 [XE262h] camshaft was recommended by Comp and a local engine builder for my 1976 Highboy with manual trans, 410 gears and 35" tires. The guy's over on the FE forum said I should keep the duration at .050 below .220 which meant the XE256H would be the correct cam choice for my build and that is what I ordered but the XE262H showed up this weekend instead [I think Santa wants me to run the bigger cam

] so it's what i am going to run.

Dec 19, 2012 | 09:54 AM

MIKES 68 F100

Logistics Pro

Joined: Jan 2011

Posts: 4,762

Likes: 54

From: Antelope Valley ,CA

I used the h395p pistons in my 390 , with 72cc heads i am at 10:1 cr
do your self a favor and home port the heads ( just smooth the nasty castings)

the xe262 is close the the lunati 62001 , you're going to love the power !!

Dec 19, 2012 | 08:51 PM