Head and intake combo for 455

Old May 9th, 2018, 10:09 PM
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Head and intake combo for 455

My current project is a 455 going into a 67 Cutlass Supreme Convertible. Short block consists of Mondello nodular crank with .010 on main & rod journals and reworked rods. Pistons are L2323.060 All have been balanced. Comp Cams XE-268H cam and Cloyes double roller. High volume Melling oil pump with no restrictors in the main oil gallery stock pan. Chrome moly steel distributor oil pump drive shaft. Crankshaft windage and valley tray installed. Comp Cams High Energy pushrods and lifters. All Clevite bearings.
I have big valve ĎCí heads that have had some chamber work done. Mondello heat crossover block-off plates. Rockers are Comp Cams roller tips on screw studs and guide plates.
Intake manifold is a Edelbrock Performer. Distributor is HEI with MSD upgrade module, coil and wires. Fuel will be supplied by a Fitech Go Street EFI rated at 400hp.
Exhaust is handled by Thornton big block factory fit headers to 2.5Ē mandrel bent X-pipe and Hooker Aero-chamber mufflers.
Drivetrain is 200-4r to 10-bolt with 3:55 gears and Powertrax traction system.
This was going to be the original plan for the engine then came along a pair of Edelbrock 6051 heads with Crane Cams roller rockers and Torker intake.
My question is are the Eddy heads and Torker to much for this cam? Use Eddy heads with the Performer? Use ĎCí heads and the Torker? Stick to original plan of Performer and ĎCí heads and shelf Eddy heads and Torker for another build?
All this came about when the 455 originally came with an RV cam, Q-jet and W-X exhaust manifolds. Built the car around that set up then the need for speed, on a budget came about I know this was long winded so thanks in advance for your time.
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Old May 9th, 2018, 10:23 PM
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Here is the spec card for the cam and the ĎCí heads.

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Old May 10th, 2018, 02:08 PM
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Use the Edelbrocks, Performer and a different FITech. That one is too small, even for your original combination.
Then if you can, return the cam if itís not been used. With the Edelbrock heads youíre better served to having more lift
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Old May 10th, 2018, 08:55 PM
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Thanks for your response cutlassefi, I was wondering if Iíd be getting the most out of those Eddy heads with that cam. Now the Fitech being small is a surprise. I called the tech line and they said it would be enough for the engine in the original configuration as long as it doesnít go over 400hp which I thought it wouldnít because I considered this a mild performance upgrade, but torque on the other hand...
I always wanted to build a stroker so Iíll probably put the Edelbrocks on that when the time comes. The cars been on jack stands for two years now and summers coming time to get it back on the road. Thanks again for the info.
Before the rebuild.
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Old June 20th, 2018, 02:45 PM
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[QUOTE=67CSConvert455;1094729]
Thanks for your response cutlassefi, I was wondering if Iíd be getting the most out of those Eddy heads with that cam. Now the Fitech being small is a surprise. I called the tech line and they said it would be enough for the engine in the original configuration as long as it doesnít go over 400hp which I thought it wouldnít because I considered this a mild performance upgrade, but torque on the other hand...
I always wanted to build a stroker so Iíll probably put the Edelbrocks on that when the time comes. The cars been on jack stands for two years now and summers coming time to get it back on the road. Thanks again for the info.
Before the rebuild.

I found this article on the web:
http://www.hotrod.com/articles/ccrp-...-engine-build/
Their build is very similar to the one iím currently doing.
I upgraded the 400hp Go Street to the 600hp Easy Street.
hopefully I can accomplish the same power numbers as the article.

I still have the Performer manifold just in case.

Just got the heads and intake back from the machine shop
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Old June 20th, 2018, 02:58 PM
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[QUOTE=67CSConvert455;1103653]
Originally Posted by 67CSConvert455 View Post
Thanks for your response cutlassefi, I was wondering if Iíd be getting the most out of those Eddy heads with that cam. Now the Fitech being small is a surprise. I called the tech line and they said it would be enough for the engine in the original configuration as long as it doesnít go over 400hp which I thought it wouldnít because I considered this a mild performance upgrade, but torque on the other hand...
I always wanted to build a stroker so Iíll probably put the Edelbrocks on that when the time comes. The cars been on jack stands for two years now and summers coming time to get it back on the road. Thanks again for the info.
Before the rebuild.

I found this article on the web:
http://www.hotrod.com/articles/ccrp-...-engine-build/
Their build is very similar to the one iím currently doing.
I upgraded the 400hp Go Street to the 600hp Easy Street.
The power numbers in the article are what I want to accomplish.

I still have the Performer manifold just in case.
Also I upgraded the lifters to Lunati Micro-Trol 71951
& pushrods to Manly chromoly 29506

Just got the heads and intake back from the machine shop
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Old August 19th, 2018, 09:25 AM
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The FiTech system usually prefers a single-plane intake. Might want to double check with them. Not sure you'd notice it but the engine will be a lot happier.
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Old August 19th, 2018, 01:19 PM
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Originally Posted by Oyler85 View Post
The FiTech system usually prefers a single-plane intake. Might want to double check with them. Not sure you'd notice it but the engine will be a lot happier.
I used one on a small block RPM, no issues.
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Old April 24th, 2019, 06:27 AM
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Did you have to modify header if not what is part number for those headers much appreciated
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