566 a460 head

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Post  Racerrick on July 29th 2017, 12:24 am

I'm  an automotive machinist so all the machine work and assembly was done by me and I specced out all the components. I started with d9te block. I rough honed on the ck10 to .005 bolted on the deck plate and hone to .003  then.to .0005- with 220 then 280 to finish.then a few strokes with 400 I usually leave the bottom bigger by a .0003. I finished honed to 4.425 so.005 clearance on custom Racetec 4032 pistons. when i clean the block I use a low rpm drill with soft hone plateau brush and pump sprayer fill with hot soapy water as the honing fluid. I stroke the bore counterclockwise min 8 times and 6 times clockwise. bore is done so next I cut the 2 bolt main caps .till the vertical was .002-.003 small, torque the stock bolts to 115 with Lucas engine assembly lube and line hone it to the middle of spec. then i line honed the cam tunnel to the min spec for durabond+.005 fp30r cam bearings then I squared deck it .006 or so, to leave .050 clearance with 1018 Fel-pro head gaskets.  I gapped the total seal classic rings on a lathe with a grinding stone in the chuck and a ring holding fixture where the tool post would normally so when gapped them to .024 top and .028 2nd they are exactly that.  I drilled the oil pump passage to 9/16 and flared it. checked all the lifter bore and the clearance is .0025-.003 with comp  869 solid rollers next round I'll put morels in it to tighten it up or maybe bush the block. the rods are Molnar Dodge 6.860 rods which had to be modded to Chevy width and the pin ends narrowed for the Racetec pistons.  the Ohio 4.6 stroke crankshaft was internally Underbalanced by 1% cause IMHO big stroke motor prefer it. A Milodon windage tray, pan and pickup attached to a Melling pump. The tray is held on with 4 oil pump pick up main bolts and coupling nuts actng as spacers   Camshaft is custom Comp Xtreme street solid roller 266 272 cl110 +4.  lobes 4878 4879 driven by Cloyes billet timing set with iwis chain..When I degreed the Cam with my 20 inch billet aluminium degree wheel it was at EXACTLY 110c/l +4  and the lobes #4878, #4879 were spot on.   The Heads are TFS A460 with REV valves, Howards 98885 Proalloy springs 245 seat 600 open Manley super7 tool steel retainers, intake throat was opened to 91% for 2.350 valves , I believe in distinct angle for the intake seats not the as delivered TFS radius valve jobs so the seat angles are intake 38 45 60 75 and the exhausts are 40 45 radius.  ports were cleaned up and flowed   345@500 390@600 415@700 422@750 . Rocker are 1.7  Comp Promagnums. when setting up rocker motion I use the 2/3 GM race shop method, not Miller mid lift. I compromised the rocker sweep with the pushrod sweep anyways the pushrod length was adjusted until the rocker sweep was .050 as measured with a dial indicator and I had a .005 in, then .015 out on the pushrod. Lift at valve was .728exh and .717int so effective rocker ratio became 1.80.  16- 3/8 thick steel spacers were fab up from cold rolled 1 1/4 x.375 steel to raise the rocker stud up as I like the rocker stud base as close to the rocker as possible and the guide plate as high as possible to reduce side sweep.  I used extra long bbc rocker studs arp 235-7203 and Dart 27002204. Guide plates were cut and welded back together. Smith Bros .145 wall 9.350 and  9.7 pushrods. Final compression was 11.5 to 1, bearing clearances .003-.0032 rods and .003 mains 20w50 VR1 1150 dominator,  a tfs intake, and 2  1/4 headers It made 900 hp at 6700 on pump gas with 25% 100ll av gas. torque was over 700tq from 4000 to 6700.  33 degrees timing.


Last edited by Racerrick on August 11th 2017, 10:03 am; edited 4 times in total (Reason for editing : add info)

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Post  BBFTorino on July 29th 2017, 1:37 am

What's it going into??

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Post  windsor on July 29th 2017, 6:54 am

I like it! Lots of technical info as well.

Any pics?
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Post  Racerrick on July 29th 2017, 9:54 am

not sure if this works.    link to pics   flickr.com/photos/157357569@N08/


Last edited by Racerrick on August 1st 2017, 3:44 pm; edited 2 times in total

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Post  windsor on July 30th 2017, 11:02 am

Yep they have to be hosted but this site also self hosts if you find the correct "image"buttons when posting.
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Post  glenevans on August 1st 2017, 11:22 am

Nice!

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Post  supervel45 on August 1st 2017, 1:11 pm

Very nice build. Cool

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Post  Racerrick on August 4th 2017, 10:16 am

BBFTorino wrote:What's it going into??
Mud truck. I like the results so much I'm going to build one for me with the cncd heads and an eliminator block

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