Top End vs Bottom End

triggers68 · March 12th, 2009, 11:28 AM

I am trying to get my motor build planned out and would like some helpful comments. 68 coupe with original 289 2v. I am looking at a top end build kit from Summit. My question is can I keep the bottom end stock or should I build it up also.

Trick Flow Specialties TFS-K514-360-350 - Trick Flow® 360 HP Twisted Wedge® Top-End Engine Kits for Ford 5.0L - summitracing.com

Eagle Specialty Products 14003-030 - Eagle Competition Rotating Assemblies - summitracing.com

Thanks ahead for your wisdom,

Mike

fatoeknee · March 12th, 2009, 03:23 PM

Unless you are planning on going EFI I wouldnt buy that TFS kit because you are buying extra stuff you dont need (The upper intake). Just get the heads/rockers/cam and save you some money. If the bottom end has never been refreshed I would go ahead and build it at the same time if you have the cash...

triggers68 · March 12th, 2009, 03:59 PM

Originally Posted by fatoeknee

Unless you are planning on going EFI I wouldnt buy that TFS kit because you are buying extra stuff you dont need (The upper intake). Just get the heads/rockers/cam and save you some money. If the bottom end has never been refreshed I would go ahead and build it at the same time if you have the cash...

I actually like the efi idea vs carb but dont want to go with all the electronics and harnesses. I planned on building the bottom end but wasnt sure if the stock crank and rods could handle the horsepower gain. The other option is going steel crank and rods.

460brevill · March 12th, 2009, 04:04 PM

all the extra pressure on top may kill the bottom.

MustangOne · March 12th, 2009, 11:04 PM

If you going to keep stock bottem end I would look for 58cc heads not the 61cc heads.
That way you can bump the compression up a little.

But if you go the rotating assembly you go with flat tops and stay at 10.0:1 and keep the 61cc heads

fatoeknee · March 13th, 2009, 12:13 PM

Originally Posted by triggers68

I actually like the efi idea vs carb but dont want to go with all the electronics and harnesses. I planned on building the bottom end but wasnt sure if the stock crank and rods could handle the horsepower gain. The other option is going steel crank and rods.

my EFI setup the wires and harnesses werent actually too bad at all - I had about 3 main wires to hook up... of course there are a few odds and ends that have to be done that get kind of time consuming and costly - I ended up nickle and diming myself to complete it

Racinjason81 · March 18th, 2009, 10:37 PM

you might as well freshen up the engine all the way,do the top and bottom end.

BlessedHellride · March 18th, 2009, 10:46 PM

I'd freshen the bottom end with some better rods and pistons for sure. Then have the rotating assembly balanced. Then I would go with a set of AFR 165 heads and one of the Comp Cams XE cams. A Holley Systemax is an awesome intake for EFI applications and you could probably find these parts cheaper than what a Trick Flow kit cost. If you wanted to stay carb'd, I'd go with a Edelbrock Air Gap intake manifold and a Holley or Demon style 650cfm carb.

March 12th, 2009, 11:28 AM	#1
triggers68 Newbie Join Date: Feb 2009 Posts: 11 iTrader: 0 reviews	Top End vs Bottom End I am trying to get my motor build planned out and would like some helpful comments. 68 coupe with original 289 2v. I am looking at a top end build kit from Summit. My question is can I keep the bottom end stock or should I build it up also. Trick Flow Specialties TFS-K514-360-350 - Trick Flow® 360 HP Twisted Wedge® Top-End Engine Kits for Ford 5.0L - summitracing.com Eagle Specialty Products 14003-030 - Eagle Competition Rotating Assemblies - summitracing.com Thanks ahead for your wisdom, Mike

March 12th, 2009, 04:04 PM	#4
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	all the extra pressure on top may kill the bottom. __________________ i sixing 200 six with 300 hp.

March 12th, 2009, 11:04 PM	#5
MustangOne Lost in the 60's 1968 GT 500 Super Snake 12.6 @ 114.3 Join Date: Mar 2008 Location: Sapulpa Oklahoma Posts: 2,053 iTrader: 0 reviews	If you going to keep stock bottem end I would look for 58cc heads not the 61cc heads. That way you can bump the compression up a little. But if you go the rotating assembly you go with flat tops and stay at 10.0:1 and keep the 61cc heads __________________ MustangOne's Car's How to post Photos in Your Thread. Vote for your Favorite Ride of the month, Every Month Modded Mustangs Facebook Last edited by MustangOne; March 12th, 2009 at 11:07 PM.

March 18th, 2009, 10:37 PM	#7
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,559 iTrader: 0 reviews	you might as well freshen up the engine all the way,do the top and bottom end. __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

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March 12th, 2009, 03:23 PM	#2
fatoeknee Regular 2002 Mustang GT Haven't run it Join Date: Jan 2009 Location: Houston Posts: 92 iTrader: 0 reviews	Unless you are planning on going EFI I wouldnt buy that TFS kit because you are buying extra stuff you dont need (The upper intake). Just get the heads/rockers/cam and save you some money. If the bottom end has never been refreshed I would go ahead and build it at the same time if you have the cash...

March 18th, 2009, 10:46 PM	#8
BlessedHellride Regular 1988 Notchback 11.19 @ 122mph N/A Join Date: Mar 2009 Location: DeRidder, Louisiana Posts: 424 iTrader: 0 reviews	I'd freshen the bottom end with some better rods and pistons for sure. Then have the rotating assembly balanced. Then I would go with a set of AFR 165 heads and one of the Comp Cams XE cams. A Holley Systemax is an awesome intake for EFI applications and you could probably find these parts cheaper than what a Trick Flow kit cost. If you wanted to stay carb'd, I'd go with a Edelbrock Air Gap intake manifold and a Holley or Demon style 650cfm carb.

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