L98 .060 over?????
Thread Starter
Advanced
Joined: Feb 2010
Posts: 55
Likes: 0
L98 .060 over?????
Can anyone tell me is it worth doing a .060 over on a 88 L98? I was going to do a 383 but I dont think the 4+3 transmission will handle it since I already blew it twice. I dont want to replace the transmission.
I have everything off the engine done to the block.
Was going to port the stock heads and new after market manifold and runners and install a 58mm throttle body.
Also I'm removing the air pump and all hoses. Do I need to keep the EGR pipe?
Need some advice Thanks,
I have everything off the engine done to the block.
Was going to port the stock heads and new after market manifold and runners and install a 58mm throttle body.
Also I'm removing the air pump and all hoses. Do I need to keep the EGR pipe?
Need some advice Thanks,
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
Mine was bored .060 over. The previous owner was not big on spending money if he didn't have to.
Personally if I was looking at further mods down the road I would want a sound bottom end. A few hundred dollars more now could eliminate concerns later.
Personally if I was looking at further mods down the road I would want a sound bottom end. A few hundred dollars more now could eliminate concerns later.
Thread Starter
Advanced
Joined: Feb 2010
Posts: 55
Likes: 0
[QUOTE=cumbercr;1573097703]Mine was bored .060 over. The previous owner was not big on spending money if he didn't have to.
Personally if I was looking at further mods down the road I would want a sound bottom end. A few hundred dollars more now could eliminate concerns later.[/QUOTE
Is it a big power gain?
Personally if I was looking at further mods down the road I would want a sound bottom end. A few hundred dollars more now could eliminate concerns later.[/QUOTE
Is it a big power gain?
Instructor
Joined: Jan 2006
Posts: 160
Likes: 1
From: Fl
honestly, the only reason to overbore on a rebuild is to have round, clean cylinder walls. Only overbore enough to clean up the cylinder walls, in case you have to rebuild later on. If you do .060 and don't need that much to clean up the walls and if you ever have to rebuild you might be looking for another block.
Thread Starter
Advanced
Joined: Feb 2010
Posts: 55
Likes: 0
honestly, the only reason to overbore on a rebuild is to have round, clean cylinder walls. Only overbore enough to clean up the cylinder walls, in case you have to rebuild later on. If you do .060 and don't need that much to clean up the walls and if you ever have to rebuild you might be looking for another block.
Instructor
Joined: Jan 2006
Posts: 160
Likes: 1
From: Fl
FYI, when i tore down my 86 with 95k miles there was almost no wear in the cylinder, I did a .030 overbore just to be on the safe side, that leaves two more (.040 and .060) standard over bore sizes left if I ever rebuild.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
If you need to replace the pistons, you might as well go bigger! I went with a +.040 bore, which also give you a half point more compression ratio, at no additional charge. A .040 overbore gives you 357 cu. inches. I could definitely feel the difference. I'd recommend a balance job for a smooth running engine. If you need to build the engine again, you are definitely an incurable Corvettoholic! My original engine went 200,000 miles!
Drifting
Joined: Feb 2003
Posts: 1,976
Likes: 2
From: San Antonio Texas
I agree with what some have posted above...bore jobs are to give you nice round Cylinders; remove scratches, etc. I'd go .010 over only if a Hone wont clean things up.This keeps thicker, stronger Bores/Block and leaves room for .020 & .030 down the road. I don't think .060 is advisable for modern SBC blocks; at least not without Sonic checking the Block first. Way back in the old days, you could bore some brands of motors 1/8" or more and that would show some power improvements.
Drifting
Joined: Dec 2005
Posts: 1,360
Likes: 3
From: NORTHEAST
If you are going togo .060 over have th cylinders sonic tested as we find very few that willl go .060 and have enough cylinder all to maintain a good ring seal.
Which ever way you go have it plate honed for good ring seal when the heads are bolted on.
Good luck with your build
Which ever way you go have it plate honed for good ring seal when the heads are bolted on.
Good luck with your build
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
If you have the engine out of the car, and are staring at 8 empty holes, a standard .030 overbore will clean things up, and there are thousands of piston sets ready to be had for cheap at the .030 oversize.
Put a cam in it that will maximize your engine's operating speeds, and you will enjoy it a hundred times more than you do now.
Use the cam out of a ramjet 350, and you will love it. the part number is 14097395, and it will give you more low end grunt, and tons of midrange, just where the TPI flows the best.
Maximize torque, and the HP numbers will fall where they may.
HP isn't what the TPI is all about.
This cam also comes in the hi-torque 383, and is a stump puller of a cam.
Put a cam in it that will maximize your engine's operating speeds, and you will enjoy it a hundred times more than you do now.
Use the cam out of a ramjet 350, and you will love it. the part number is 14097395, and it will give you more low end grunt, and tons of midrange, just where the TPI flows the best.
Maximize torque, and the HP numbers will fall where they may.
HP isn't what the TPI is all about.
This cam also comes in the hi-torque 383, and is a stump puller of a cam.
Drifting
Joined: Feb 2003
Posts: 1,976
Likes: 2
From: San Antonio Texas
Again, why go .030 when the thing only has 56K miles on it. A Hone or if you were buying new Pistons for some reason (383-396-421), .010 would clean it up. Go .020 or .030 on the next rebuild. Hone Plate like Blockman said; it costs very little extra.
That #14097395 Cam is actually a Truck Cam ( 196/206) and is smaller than the stock L98.
That #14097395 Cam is actually a Truck Cam ( 196/206) and is smaller than the stock L98.
