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#1
07-02-2017, 01:51 PM
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1965 421 Tri-power
I got my 421 back from Butler Performance this week.
They bored the block to 4.120" and added a 4.250" stroke forged crank. They ported my 670 heads and added XR288HR hydraulic roller cam. The 1965 Tri-power was restored by Mikes Tripower. They put it on the dyno and it produced 491 HP and 544 ft pounds of torque. I am very pleased with the results. |
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#2
07-02-2017, 02:19 PM
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congats. sounds like a strong engine!
is it a single plane intake?
__________________
1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L Last edited by 74Grandville; 07-02-2017 at 02:25 PM. |
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#3
07-02-2017, 02:31 PM
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All factory Tri-Power intakes are dual-plane. A few aftermarket aluminum single-plane intakes were produced but none were made to fit '65 and later heads.
--------------------------------------------------- Nice engine, good numbers, should be a screamer on the street.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#4
07-02-2017, 02:43 PM
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Quote:
Have fun and enjoy the Horsepower. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#5
07-02-2017, 04:03 PM
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Quote:
Dished pistons?
__________________
 1966 GTO 1966 421-9.3-1 comp-Race Tec 23cc Pistons 1966 Tri-Power 1967 670 Heads Pontiac "Highlift" TriPower Cam by SpeedPro DUR 214 Int 224 Exh @.050 - 107 ICL LIFT .445" Int .465" Exh Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers 1966 Muncie Wide Ratio 4-Speed 1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears |
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#6
07-02-2017, 04:04 PM
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Quote:
__________________
- '67 GTO '97 993 C4S '86 951 '05 V70R |
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#7
07-02-2017, 05:39 PM
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ah the tri-power comment went right over my head.
begs the question though, Are the runners shorter like a single plane when the secondary carbs open. i only asked as I was running some DD2000 numbers to see if I could figure out the combo. single plane intake was almost spot on.
__________________
1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L |
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#8
07-02-2017, 06:49 PM
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What a nice engine. I have a 62 Catalina that would love that power plant. What RPM were your HP and Torque peaks? Also your compression ratio? I plan to build a similar engine in the future.
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#9
07-02-2017, 07:13 PM
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Sounds like a neat engine. Ditto request for cr and rpm for hp and torque peaks.
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#10
07-02-2017, 07:48 PM
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I am not sure what CR is. I have sent Butler an email asking.
A few more specs: CI = 453 Bore = 4.120 Dished piston = 27.18 CC 491.4 HP @ 5,500 544.1 torque @ 4,200 |
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#11
07-02-2017, 07:51 PM
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Quote:
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#12
07-02-2017, 07:52 PM
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Congrats! Nice power.
__________________
1961 Corvette 4spd. 1969 Chevy K5 Blazer - currently restoring |
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#13
07-02-2017, 08:07 PM
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Quote:
I just plugged your numbers into a compression ratio calculator and assuming those 670 heads have 71cc chambers after they took a very slight cut to make sure they were flat, your compression ratio would be 9.64 if your head gaskets are .041 crushed. Slightly more of course if the gaskets are thinner. What a nice engine making all of that power at modest (and safe) rpms.. |
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#14
07-02-2017, 09:09 PM
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Again, nice engine. What did they use for exhaust? Manifolds or headers. What are you installing this engine in? Stick or auto?
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#15
07-02-2017, 09:37 PM
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You will have a lifetime driver with ~ 500 HP and ~ 550 lbs/ft of torque and could take that vehicle to any show in the country (driving it there). Nice job to all involved.
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#16
07-02-2017, 09:44 PM
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I Will check all these numbers tomorrow and let you know. |
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#17
07-02-2017, 09:47 PM
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Quote:
It will be going in a 1965 GTO 4-speed. |
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#18
07-02-2017, 09:51 PM
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I will try and post some pictures tomorrow
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#19
07-03-2017, 07:07 AM
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Congrats on the numbers.
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#20
07-03-2017, 11:41 AM
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After getting back email from Butler and looking at my spec sheet on the motor, Here are the numbers.
CI = 453 CR = 9.44:1 Dished pistons = 27.18 cc Head chamber = 73 cc Head gasket = .044 Valve lift intake = .520 Exhaust = .540 Duration @.006 Int = 288 Exh = 294 Duration @ .050 Int = 236 Exh = 242 Lobe separation = 110 It was ran on 91 octane pumped gas 507 torque @ 3,000 544.1 torque @ 4,200 491.4 HP @ 5,500 I think that's everything. |
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