706 5.3 heads question
Thread Starter
Launching!
Joined: Dec 2003
Posts: 288
Likes: 0
From: Tifton, Gerogia
706 5.3 heads question i have some ported 5.3 heads and was wondering if i could just drop in some 2.00 in valves in place of the 1.89 in or should i just go ahead and do 2.10 in valves? and what kind of valves do i buy cuase the 5.3 valves look differint from the 5.7s valves
what shold i do help thanks there is a chart below
Casting Number 241
LS1 / 5.7L Passenger Car and Corvette
97-00 P/N 12559853
01-03 P/N 12564241
Material: Aluminimum
Combustion Chamber Volume: 66.67cc
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
Casting Number 706 or 862
99+ 4.8L Truck P/N 12559852
99+ 5.3L Truck P/N 12561706
Material: Aluminimum
Combustion Chamber Volume: 61.15cc
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches
what shold i do help thanks there is a chart below
Casting Number 241
LS1 / 5.7L Passenger Car and Corvette
97-00 P/N 12559853
01-03 P/N 12564241
Material: Aluminimum
Combustion Chamber Volume: 66.67cc
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
Casting Number 706 or 862
99+ 4.8L Truck P/N 12559852
99+ 5.3L Truck P/N 12561706
Material: Aluminimum
Combustion Chamber Volume: 61.15cc
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches
I recommend upgrading to 2.02" intake and 1.57" exhaust valves. These will fit nicely onto the factory installed seats and they also fit nicely into the 3.90" bore. Larger valves will require installing larger seats and that gets into some buck$. If your on a budget, then install a 2.0" intake and go have some fun.
What size cam are you planning? Valve/piston clearance could be an issue with larger valves.
Good luck,
Richard
What size cam are you planning? Valve/piston clearance could be an issue with larger valves.
Good luck,
Richard
Thread Starter
Launching!
Joined: Dec 2003
Posts: 288
Likes: 0
From: Tifton, Gerogia
okay so i could just install 2.00" intake valves without any kind of machine work being done? and i plan on running neither a TR 220/220 or TR 224/224 my bottom end is stock 98 LS1, also this engine is going into a S-10 blazer, i will have full bolt ons and true free flow duals..................
Trending Topics
It'll cost between $275-$300 to properly seat the valves. That also includes cleaning, surfacing and new valve seals.
Yes more power will be gained, but I can't quote numbers.
That S10 sounds like a ton of fun!
Good luck,
Richard
Yes more power will be gained, but I can't quote numbers.
That S10 sounds like a ton of fun!
Good luck,
Richard
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
