l92 with prc 5.3 head build
Thread Starter
On The Tree
Joined: Mar 2009
Posts: 175
Likes: 1
From: shrewsbury, ma
l92 with prc 5.3 head build Some changes being made this winter/spring. I have decided to go with a forged lower end l92 using wiseco 4.070 pistons, eagle 6.125 rods and stock crank for safety. I am also sticking with my prc 5.3 heads for the time being. The old stock bottom end 6.2 with a pat g 235/243cam and these heads went almost 126 mph in a 3700 pound car. Compression will be unchanged @ 11.46:1.
I have sent the heads out to Ed Curtis for a freshen up and a new matching cam. The springs were shimmed to 1.770-1.780 to achieve 160 pounds of pressure on the seat. A new valve job was also done. Ed ended up specing out a tweaked version of his hellraiser cam. (239/244 .638/.631) I also had my fast ported by him last year but never got to see the results. I will be using that on this motor as well.
The old set up made 475/436 on a mustang dyno but Ed thinks it may have been unstable over 6200 with the lsl lobes and the lower seat pressure. Im not sure what its going to do but i told Ed i wanted 10's and 130ish traps. Lets hear it!
I have sent the heads out to Ed Curtis for a freshen up and a new matching cam. The springs were shimmed to 1.770-1.780 to achieve 160 pounds of pressure on the seat. A new valve job was also done. Ed ended up specing out a tweaked version of his hellraiser cam. (239/244 .638/.631) I also had my fast ported by him last year but never got to see the results. I will be using that on this motor as well.
The old set up made 475/436 on a mustang dyno but Ed thinks it may have been unstable over 6200 with the lsl lobes and the lower seat pressure. Im not sure what its going to do but i told Ed i wanted 10's and 130ish traps. Lets hear it!
Last edited by mercccc; Apr 4, 2012 at 07:18 PM.
Trending Topics
Joined: Jul 2007
Posts: 1,503
Likes: 178
From: ELSA, South TEXAS (956) 802-7700
sounds like the potential will definitely be there. if suspension and all else is tweaked and set up accordingly, it is possible. good luck, rob. 
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Thread Starter
On The Tree
Joined: Mar 2009
Posts: 175
Likes: 1
From: shrewsbury, ma
It was a tad over 3000$ just for machine work. It was roughly 1100 for rods and pistons, 450 for the main and head studs, 350 ish for all the bearings, 460 for the cam. I still need a melling oil pump, rollmaster timing set, morel link bar lifters, fti .116 wall pushrods. I have been storing parts for the last year and a half for this.thing lol
It was a tad over 3000$ just for machine work. It was roughly 1100 for rods and pistons
Almost seems like it would've been worth it to get an already build brand new shortblock for the same price and without the 8 month wait.
Thread Starter
On The Tree
Joined: Mar 2009
Posts: 175
Likes: 1
From: shrewsbury, ma
The block was decked square, the ends squared, valley and oil pan rails slightly gone over, arp main studs installed/line honed, cnc honed with tourqe plate, race balance, rods pin fitted for correct clearance, i had the eagle rods checked for alignment and made sure the ends were round, crank needed some attention but did not need to be cut, cam bearings installed, short block assembly, file fit rings for application, it also needed a small amount of welding where the starter bolts, there was a hairline crack.
Thread Starter
On The Tree
Joined: Mar 2009
Posts: 175
Likes: 1
From: shrewsbury, ma
Update: I just got my melling oil pump, rollmaster timing set, and comp trunion upgrade. The morel 5290s should be here this week. Im looking at cometic head gaskets. What bore size would be better the 4.085's or the larger 4.1. I'm thinking a .040-.045 thickness would be safe. Thoughts? I should beable to get this thing rolling in the next few weeks!
