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Author
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Topic: hi-po motor
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two89w
Gearhead Posts: 319
From: sydney australia
Registered: Sep 2002
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posted 10-16-2002 08:46 AM
   
what if any, are the differences between a hi-po short motor and a a stock 289?
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Dave Gibson
Moderator Posts: 10139
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99
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posted 10-16-2002 04:50 PM
See if you can find or purchase "The 289 High Performance Mustang" book by Tony Gregory. Lots of great information to help i.d. Hi-Po blocks, heads, cranks, carbs, etc.  Dave & Terri ------------------
Poison Ivy (Dave's)
'65 Fastback Modified 289 4V, C-4, dual exhaust, styled steel wheels, rally pac, A/C
'02 Explorer XLT, Black, 3.73:1 limited slip, class III tow package! [This message has been edited by Dave Gibson (edited 10-16-2002).]
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Rustang
Gearhead Posts: 821
From: Clarion PA
Registered: Nov 2000
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posted 10-16-2002 05:37 PM
I know there's others on here that know more on this, but from what I remember, they have heavier main caps, thicker dampner, beefier rods, and the pistons are domed. Some are 5 bolt bell, newer ones 6.------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
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two89w
Gearhead Posts: 319
From: sydney australia
Registered: Sep 2002
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posted 10-16-2002 05:58 PM
are they worth more than ordinary set ups,as i sold a long motor to a guy i know for $600 and he told me last night he thinks its a hi-po motor
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clevelandstyle
Gearhead Posts: 1309
From: central Indiana
Registered: Jul 2001
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posted 10-16-2002 07:00 PM
I know Alex can answer this hipo question easily.
BTW. Every old fart thet I've ever talked to that had a 289 calls it a hipo. I tend to be skeptical.  ------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 351C 4V
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Rustang
Gearhead Posts: 821
From: Clarion PA
Registered: Nov 2000
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posted 10-16-2002 09:01 PM
The heads are the easiest clue, as the spring seats are cast up around the spring instead of being flat or below the spring seat like the garden variety
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V8 Thumper
Gearhead Posts: 4681
From: Phoenix, Arizona
Registered: Dec 2001
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posted 10-16-2002 09:30 PM
I don't think the pistons were domed, but had only two valve reliefs instead of the four reliefs on all garden variety cast slugs. Solid lift flat tappet camshaft, dual point distributor, heavier duty motor mounts and a larger alternator pulley (along with the above mentioned beefier block and rods). Anyone else?
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SteveLaRiviere
Administrator Posts: 45869
From: Saco, Maine
Registered: May 99
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posted 10-16-2002 09:37 PM
271 horse vs 200 or so for the vanilla version, right? ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 10-16-2002 10:15 PM
Thick 2 bolt main caps.
High nodular crankshaft.
Counter balance weight between crank gear and front main cap.
Flat top pistons with 4 valve reliefs.
Solid lifters.
As mentioned above, cast in valve spring seats for HD valve springs with dampners in heads with slotted push rod holes.
Screw in rocker arm studs.
Chrome valve covers.
8 inch diameter 1.300 thick harmonic balancer.
3/8 rod bolts.
Aluminum timing cover with cast in timing pointer.
Aluminum water pump. 289 HIPO was 271 HP
289 2 barrel was 200 HP
289 4 barrel low compression was 210 HP
289 4 barrel high compression was 225 HP
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Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
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