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#1
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Lifter bore brace.
Under what conditions is a lifter bore recommended ?? Cam specs are below. Spring pressures according to Tin Indian who made my heads is 110-120 on the seat. About 300 open.
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67 Firebird Convert 455 +.060 TH400 74cc KRE d-ports piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.50 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s Last edited by 67 455 Bird ragtop; 12-28-2019 at 09:48 AM. |
#2
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Post number 3
https://forums.maxperformanceinc.com...r+bore+bracing Your intake lobe has about 161 degrees duration at 0.200" lift and the exhaust about 171 .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE Last edited by Steve C.; 12-28-2019 at 10:05 AM. |
#3
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Thanks Steve. Very good info. I missed that one when I did a search some how.
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67 Firebird Convert 455 +.060 TH400 74cc KRE d-ports piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.50 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s |
#4
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FYI :
I have a new brace kit out that I'll start advertise/selling here early next month.... Digitized from the 481988 PMD blocks. Each aluminum block has two clamping forces acting on it plus a 360° epoxy bond.. It'll also serve a job of retaining loose valve train parts from hitting the camshaft. Kris. ( click the pics for a larger copy )
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*** THE BIG BRACE is here *** |
#5
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Kris...looks very nice!
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#6
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Quote:
what kind of pricing are you looking at? SPEED SAFE, NICK
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"The grass is not greener on the other side, its just fertilized with different $h!t" |
#7
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That is a nice piece(s) Kris! As for the topic and the way I interpreted Ken Keefer (Pontiac Dude) from my recent post, just about any solid roller lifter would wisely benefit (insurance) from a lifter bore brace. The #2 and #6 intake lifter bores are totally unsupported due to the direction of the camshaft rotation (away from the block and towards the center webbing) would benefit from using lifter bore braces. I'm using a Comp 308R (262 @ .50 duration .575 lift) cam for this 428 build and I am using a (used) Butler Mega-Brage just so I don't have to worry or think about it...
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Johnny US Army Retired 1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
#8
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All engines should be braced. Pontiac cut corners not following the RAV and SD blocks. It’s not only about the cam profile, but in the event a lifter takes a crap.
Calvin Hill Hill Performance 708-250-7420 |
#9
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Quote:
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The Following User Says Thank You to hgerhardt For This Useful Post: | ||
#10
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Thanks for the interest,
this kit will always need some fitting so I’m not sure if 316/17-4 steel will be popular.. I do it the subtractive way as is. Pontiac Yodas have used aluminum braces for years and poured aluminum in the heads as well w/o expansion issues that I’m aware of. Final pricing not quite yet out there.. Ps. Bare in mind that these are modeled after 70’s blocks and blocks will vary.. pre 70’s blocks seem to need more fitting work and they lack material in some areas. Kris. Sent from my iPhone using Tapatalk
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*** THE BIG BRACE is here *** |
#11
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...and i thought the #2 Exhaust Lifter bore was the worst/only problem.
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#12
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Pretty slick looking!
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#13
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I'm with you on that one Calvin, even if using a relatively mild hydraulic roller. A full SD brace kit doesn't cost much and you'll sleep better at night.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#14
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It is for me. I have a 455 4-bolt main '70 XF block standard bore with a hairline crack in #2 exhaust. That brace mite be the answer.
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3 Generations of "Beach Boys Racing" ! Everybody knows somthin. Nobody knows everything ! 1st time on a dragstrip, 1964. Flagstart ! "Thanks for the entertainment." "Real Indians Don't Wear Bowties" |
#15
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Quote:
Interested when it’s released.
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#16
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It has been advertised in the perf parts for sale forum already.
http://forums.maxperformanceinc.com/...d.php?t=836832 |
#17
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Quote:
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#18
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Thanks for the interest... I just posted up my new install guide as a huge image bundle down in the ad....
Kris.
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*** THE BIG BRACE is here *** |
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