Author Topic: 427 - 482, CNC Edelbrock heads, big solid roller, 850 QFT  (Read 14798 times)

faulkdaddy

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Re: 427 - 482, CNC Edelbrock heads, big solid roller, 850 QFT
« Reply #5 on: February 10, 2013, 11:58:37 AM »
Barry,
   You just confirmed that my 466 stroker is making atleast 700h/p as we had thought. My compression is .5 higher, cam is  Solid roller 275 @.050 I and 286 @.050 E. .750 lift after lash. head flow 329 @.600 324@.650 320 @.700 intake and exhaust is 241 @650, 244@.700 and 244@750 as well. Intake is Dove (ported) heads are Dove Ported. Erson  roller system  235 # seat and 700# @ full lift. I do however run a 1050 dominator. Thanks for putting this up. To some this engine and your 482 may seem radical but, in a1967 f100 with a Liberty Clutchless 5 speed drag truck it is fairly docile and smooth and has been reliable to say the least. I am still using the 4.25 crank I bought from you in 2006. Been out once for a check and micropolish that is all. keep up the good work. Later

bruce faulkner

canada1

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Re: 427 - 482, CNC Edelbrock heads, big solid roller, 850 QFT
« Reply #4 on: January 31, 2013, 12:48:56 PM »
This type of combo would be a great test for the CNC Eddys vs. an out of the box Survival Motorsports head.
Would love to see a high power shootout to really evaluate the new castings.

ScotiaFE

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Re: 427 - 482, CNC Edelbrock heads, big solid roller, 850 QFT
« Reply #3 on: January 26, 2013, 08:43:49 PM »
NICE!!!

The T will be needing a couple of them carb thingys. Just for a stock look. ::)

hotrodfeguy

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Re: 427 - 482, CNC Edelbrock heads, big solid roller, 850 QFT
« Reply #2 on: January 26, 2013, 01:39:49 AM »
Was that a "custom" roller cam or is that a STD cam you can order through you?
What would those FT pistons come out to CR wise on a STD 76 cc chamber without a shaved ED head?

I am looking at a real similar build soon when I off load my 480 to Dave, I am looking at a 427 @ .060 over and 4.375 stroke If my math is right thats 506 CI. Tunnel wedge intake and 750 VAC sec carbs as you said. That should make full use of that cam and the twin carbs I think will deliver the air. I think with the CR down a point or so should put me in the same park as this build. As I have fully ported my heads my ED heads myself with the MR valves in them.
« Last Edit: January 27, 2013, 10:31:03 AM by hotrodfeguy »

Barry_R

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427 - 482, CNC Edelbrock heads, big solid roller, 850 QFT
« Reply #1 on: January 25, 2013, 10:20:54 PM »
The common cliche tossed around by every car guy on earth is "it's in the combination, not just a collection of parts".  Last week we tried a combination partially made up of a collection of pre-existing parts and it worked pretty well - better than expected.

The candidate was a Genesis based 482" engine - Scat 4.25 stroke and 4.25 bore.  The engine was going into a pretty lightweight bracket style T-bolt with partial tube chassis, so we were able to get pretty serious about cam and compression - but there was a budget and functional constraint as well - wanted to stay out of the "pure race" stratosphere on cost and reasonably low maintenence desired.  We thus re-used existing parts from the previous milder engine - a set of Edelbrock heads, a 4150 flange Victor intake, a Moroso "T" type pan, the older MSD billet distributor, and the Meziere electric water pump.  All very good parts to start with.  The target power was 650ish, and I thought that would be pretty easy - expected to go 670 or so given the opportunity.

We CNC ported the Edelbrock heads, as older castings they were not perfect but came out just fine.  We used a flat top Diamond piston and milled the heads for around 12:1 compression (they needed to be milled in any case, so it was a low cost way to get what we wanted).  Rings are a basic 1/16-1/16-3/16 low tension race set, and we back cut the second to drop friction a bit.  We port matched the Victor and acquired an 850 Quick Fuel carb - more on that in a minute.  The cam is not exactly an RV grind - 275/284@.050 with .770/751 lift on 110 LSA.  Subtract the lash and we're right against the .750 lift limit suggested for the Manley Nextec springs I used.  I chose the springs to hold spring pressure to +/-610 open and +-/235 on the seat.  T&D bolt on rockers were used - I described the setup in detail to the guys at T&D and they felt we'd be OK.

We bolted the package to the dyno and it sounded pretty wicked right off the bat.  A few warm ups and we made pulls - the sucker ran really strong.  Really, really strong - reaching 716 horsepower at 6800RPM.  She flattened out from there past 7000.  A look at vacuum data showed why - that 850 was holding 2.4 inches of vacuum at that RPM!  A Dominator would definitely have picked up more power - but that move would have cost an extra grand or so.  Still considering the fairly basic package - shelf stock pistons, pretty normal rings - no gas ports, no super thin expensive stuff, bolt on rockers, and a small carb - this made a really good showing.

The obligatory images, dyno charts, and Youtube video are below






http://youtu.be/aFALF--O9_w