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05-19-2005 06:39 PM #1
How to tell 390ci 300hp from 375hp
I have a 61 T-Bird and do not know how to tell what Holly 4B engine I have. Markings on engine? Data base of Vin or serial Numbers? The serial number plate list style as 55.
Anybody have some ideas
Thanks
Ed
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05-19-2005 07:08 PM #2
I just read the new guy identify thread. I will crawl around and get the various numbers discussed.
What were the differences between the two engines?
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05-20-2005 03:42 AM #3
Ed, the block will have HP markings on it. Look on the right side of the block where your casting number is. You should see a HP cast into the block. All 375 and 401 HP 390's have this HP mark.
G.
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05-20-2005 04:23 AM #4
G,
I've been having problems with right and left.
You are talking about the number on the generator / pasenger side?
Ed
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05-20-2005 05:48 AM #5
If it's the original engine it's an easy question. It's the "Z" code 300HP version (the Z is found in the Vin on the door tag).
There were no optional or special order engines available in the 61 Birds.
The 62/3s had the optional "M" code engine available. This was the higher compression Tri-power motor.
The Tri-power is a nice upgrade to the engine, but if you go looking for one make sure you get the T-Bird version as it's shorter to fit under the Thunder Chicken hood and the 406 versions won't let the hood close.I've NEVER seen a car come from the factory that couldn't be improved.....
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05-20-2005 06:26 AM #6
Originally posted by EdBird
G,
I've been having problems with right and left.
You are talking about the number on the generator / pasenger side?
Ed
Drivers side = left side
Passengers side = right sideFrank
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05-20-2005 06:49 AM #7
Well, unless you happen to be in Australia, then left and right is all messed up again..............Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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05-20-2005 06:56 AM #8
Originally posted by Dave Severson
Well, unless you happen to be in Australia, then left and right is all messed up again..............
And using a mirror under the hood will compound the mess up more.
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05-20-2005 11:35 AM #9
Geez, thanks Walt. Now you have me confused. If I'm using a mirror and standing backwards, then...........Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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05-21-2005 07:04 AM #10
Check to see if you cast a reflection in a chrome hubcap,,,,if you dont,,, then it's a good bet you have been bitten by the hotrod bug,,and shall forever more,, "Haunt the auto swapmeets"....Booowahhahahhahhh"I don't know everything and i like it that way"
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05-22-2005 06:51 AM #11
Ed yes it will be above the casting number around the generator area. The HP letters are around 1/2" tall. Mike is correct though about the Z code 390. This would not be a HP block if original. The 390HP, 406 and early 427 blocks have this HP identfier. It's also on the rear of the block and inside by the cam bearing and main bearing areas. G.
EDIT: Also the HP is cast in the lifter valley of the block.Last edited by FFR428; 05-22-2005 at 08:36 AM.
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06-16-2005 07:30 AM #12
Best way to tell which is which is to stand on the loud pedal!
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06-17-2005 01:59 AM #13
.Frank
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