Engine Plan Please Review
Thread Starter
Pro
Joined: Aug 2001
Posts: 626
Likes: 0
From: Lake Lure NC
Engine Plan Please Review
I am finally ready to start the engine build on my 92 LT1. My objective of the build is to create 425 flywheel horses. Here is my plans:
-Stage 3 heads by CNC Cylinder heads 11:1 compression
-220/230 roller cam
-Gold Roller Rockers
-52mm throttle body
-Stainless works headers 1 5/8 primary running to corsa exhaust
-No Cats Off Road only of course
-Block work will be 30 over (355)
-tuning
Now for the questions
- Will I need bigger injectors to go with this setup?
- Will the standard crank, rods and hypereutetic pistions be ok or do I need forged? And a better question might be are forged worth the money in this setup
- Is my horsepower expectations resonable?
My goal is streetable with reliable horsepower I can take to the track. Autocross, Roadrace and drag.
-Stage 3 heads by CNC Cylinder heads 11:1 compression
-220/230 roller cam
-Gold Roller Rockers
-52mm throttle body
-Stainless works headers 1 5/8 primary running to corsa exhaust
-No Cats Off Road only of course
-Block work will be 30 over (355)
-tuning
Now for the questions
- Will I need bigger injectors to go with this setup?
- Will the standard crank, rods and hypereutetic pistions be ok or do I need forged? And a better question might be are forged worth the money in this setup
- Is my horsepower expectations resonable?
My goal is streetable with reliable horsepower I can take to the track. Autocross, Roadrace and drag.
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Originally Posted by mothersworry
I am finally ready to start the engine build on my 92 LT1. My objective of the build is to create 425 flywheel horses. Here is my plans:
-Stage 3 heads by CNC Cylinder heads 11:1 compression
-220/230 roller cam
-Gold Roller Rockers
-52mm throttle body
-Stainless works headers 1 5/8 primary running to corsa exhaust
-No Cats Off Road only of course
-Block work will be 30 over (355)
-tuning
Now for the questions
- Will I need bigger injectors to go with this setup?
- Will the standard crank, rods and hypereutetic pistions be ok or do I need forged? And a better question might be are forged worth the money in this setup
- Is my horsepower expectations resonable?
My goal is streetable with reliable horsepower I can take to the track. Autocross, Roadrace and drag.
-Stage 3 heads by CNC Cylinder heads 11:1 compression
-220/230 roller cam
-Gold Roller Rockers
-52mm throttle body
-Stainless works headers 1 5/8 primary running to corsa exhaust
-No Cats Off Road only of course
-Block work will be 30 over (355)
-tuning
Now for the questions
- Will I need bigger injectors to go with this setup?
- Will the standard crank, rods and hypereutetic pistions be ok or do I need forged? And a better question might be are forged worth the money in this setup
- Is my horsepower expectations resonable?
My goal is streetable with reliable horsepower I can take to the track. Autocross, Roadrace and drag.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by Pete K
You are asking for reasonable results. Stock injectors will likely be fine. Factory crank and rods will likely do. You at least should upgrade to forged pistons for insurance.
I would also upgrade the rods to a good 4340 H or I beam. There are Eagles around that are very good and decently priced. You can do a 6" rod in your 350 which is worth a bit more performance. Plus it will help with running 11:1 compression. I am not totally convinced that rebuilding the stock PM rods and upgrading to new hi-strength rod bolts are that reliable. Getting a set of new rods is added insurance, and as stated above will enhance performance and reliability. Off the shelf forged replacement pistons are very reasonable as well, and the added strength is also worth it.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Hell, why not an aftermarket block and a forged crank while he's at it? How about a dry sump oiling system? *I* think the original plan is sound. The power expectations might be a little optimistic, but it ought to be a good runner just as he's outlined it.
RACE ON!!!
RACE ON!!!
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by mothersworry
Does this mean that the stock crank is sufficient for 425 horseand the weekness in the lt1 is rods and piston?
One also has to take into account that having to buy bolts, machine the rods costs X amount depending on the machine shop. You can buy forged 5140 rods from Eagle for less than $250 from Summit or step up to their 4340 rods for under $450.
Given the cost of a set of ARP rod bots at $60, labor to rebuild the rods at around $20 each and you have a total of $220 which is nearly enough to cover the low end set of the Eagle rods.
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