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Discussion Starter · #1 · (Edited)
What I started with - Built in 2011.

4.605 bore x 4.25 stroke = 565 actually 566"
A-460 Block
Crower/Ford Motorsport crank 4.25 stroke ( .020 under)
Crower rods w/ BBC journal 6.536"
Modified A-460 angle milled with 2.40" Ti intake 1.88" Ex w/ 66cc chamber
Carb: Old - Holley Barry Grant 1,050 (from 1991) It's been reworked a few times now.
Crower Roller cam (Danny Crower) 278/285 @ .050 with .438 lobe lift ( installed at 4* advanced intake opening at 30*) 109IC
T&D Shaft rockers 1.8 ratio
Manton Push rods 3/8" thick wall.
Arias pistons, gas ported (13:1)
Akerly & Childs ring pack .043, 1/16th, 3/16th with a Tool Steel top ring
Stephs oil pan w/ kick out
Kaase oil pump
MSD crank trigger
Cometic head gaskets .045






Did a back yard hone job and put in a new set of rings from Akerly and Childs: .043,1/16th, 3/16th lite tension oil ring. Added a GZ Vac pump.

Put everything back together with the help of an old friend, Geoff Mummert.

Played around with the Dynomation 6 program and a dozen plus different cam profiles. Ended up with a cam profile we liked and placed the order with Comp. When we got the cam it was smaller than we ordered. It was delivered 275/277 @ .050 lobe lift .455/.421 (ordered 278/279) cam is 4* smaller @ .200 than ordered. Cam ground on a 113 lobe sep. Lift .819/.758

GZ vac pump pulling 9.5" and we replaced the old oil pan with a new pan from Williams.

We made two trips to Westech over two months.
Here's what we ended up with:







Lightly ported TR:


Fully ported TR:


Cly A/F's lightly ported intake:


Cly A/F's fully ported and worked floor:


Here's an overlay of the single 4 and the new TR setup:


All else being equal the GZ vac pump was worth about 30 hp.

This rebuild has given me a few good ideas for the 600" pump gas I'm going to do.
 

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Discussion Starter · #3 · (Edited)
The intake lobe is about what we first wanted from Comp ( as far as duration goes at both .050 and .200") and it has a bit more lift .010" . The inverse radius might have some benefit. He picked the same lobe I was looking at.

The exhaust lobe he picked is just a tad bigger than ( 1 lobe up) from what I was looking at from his lobe designs. We ( me and Mummert) don't think this head needs too much on the exhaust side. I wish I had the time and $$ to spend time on the dyno to prove it. It would be interesting to swamp out the T&D 1.8 rocker on the dyno to a 1.65 ex and see what happens.

The Comp is ground on a 113* lobe sep. The new cam is on a 112*. My current PV was a bit close to get the cam on a 110*. (what I wanted to try). I'm not sure if this cam will get me 800 lbs ft, but we'll see.

When we run it I'll post the exact specs.
 
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Discussion Starter · #4 · (Edited)
Here's an overlay from the single 4 with the Crower cam that was originally ground in 2000. It had a regrind some years later that changed the specs -

Old Crower cam - On dyno in 2011 - Red color .
regrind on cam from Cam Doctor: 281/286 @ .050 & 201/206 at .200" installed 4* advanced IO @ 30* ground on a 113 lobe sep
Lobe lift .436- .438 with 1.8 rocker

New Comp cam- Blue color - On dyno in March of 2021

275/277 @.050 & 196/186 @ .200" IC @ 26* ground on a 113* lobe sep
Lobe lift .455-.421 with a 1.8 rocker.

 

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Discussion Starter · #5 ·
Engine install:







Here's how it fires and idles 95% of the time:

 

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Discussion Starter · #7 · (Edited)
They are no longer than the over the transom headers on the dyno. 32”
 
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