383/Stroker Guru's Please Step Inside
Thread Starter
Racer
Joined: Apr 2003
Posts: 286
Likes: 2
From: Suffolk VA
I believe Summit sells Hyper pistons as a recommended part for 383 stroker motors... thus I don't see an issue there..... I think if you stick to your original plan of low $$$ and remember that you get what you pay for you'll be happy for a few passes anyway.
Team Owner
Joined: Sep 2003
Posts: 88,393
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From: eville in
Originally Posted by KyRP2NITe Corvette
I believe Summit sells Hyper pistons as a recommended part for 383 stroker motors... thus I don't see an issue there..... I think if you stick to your original plan of low $$$ and remember that you get what you pay for you'll be happy for a few passes anyway.
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
If you do not run lean you will be very pleased with the durability of "el cheapo" stuff. I just wore out my "el cheapo" 383 that I built in 96 or 97. After many miles and dragstrip beating it finally started blowing oil out the dipstick. It owes me nothing. I will likely rebuild it and keep it for back up or possibly sell it. I was warned almost daily about how foolish it was to use such low dollar stuff. Kept it on the rich side and I got very lucky. It worked for me.
Team Owner
Joined: Sep 2003
Posts: 88,393
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From: eville in
Originally Posted by Pete K
I assume so. I haven't ripped into it yet. Still runnin pretty well and hitting on all 8. Only blows out under heavy load with rpm's. Been using oil for a few months. 
Race Director
Joined: Feb 2004
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Originally Posted by comp
how bad??? can you do a leak down test before you open ???
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
While we are on the subject of budget rebuilds,
are the Vortec PM rods the same as the LT1/4 PM rods?
All the crate motors seem to based around a Vortec roller block and state they have forged PM rods.
GM#10108688
are the Vortec PM rods the same as the LT1/4 PM rods?
All the crate motors seem to based around a Vortec roller block and state they have forged PM rods.
GM#10108688
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Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by Pete K
The motor had the kb pistons and were loose from day 1. It has something like .038 in the top ring gap. That is what kb wanted. I will never run those pistons again. Noisy and oil pumper from the 1st day it fired.
Originally Posted by rodj
All the crate motors seem to based around a Vortec roller block and state they have forged PM rods.
GM#10108688
GM#10108688
RACE ON!!!
Race Director
Joined: Feb 2004
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Don't be fooled by kb's claims. They claim that if piston to wall is less than ...0025 they will be quiet. Mine are set at .002 and they have been noisy as hell. The min is .0015 and they have a max clearance of .005 (if I recall correctly) They took the abuse well but annoyed the heck out of me with the noise. I look foward to the day I toss em in the trash. They advertised them as "strong like forged and quiet like cast" They don't make that quote anymore.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
"They may use a forging method to compress the powder, but that shouldn't be confused with a forged steel rod that is impacted from a solid chuck of steel"
I am aware of the differences in manufacture.
All the GM HiPo engines including the LT1 /4 , ZZx motors use the forged powdered metal rod (#10108688) stated to be good for 450hp , I just can't establish if the Vortec one is the same.
I am using a L31 Vortec roller block for my 383 build up and if the Vortec rods are the same quality as the LT1s then I will reuse them and put the saved money into new heads.
I am aware of the differences in manufacture.
All the GM HiPo engines including the LT1 /4 , ZZx motors use the forged powdered metal rod (#10108688) stated to be good for 450hp , I just can't establish if the Vortec one is the same.
I am using a L31 Vortec roller block for my 383 build up and if the Vortec rods are the same quality as the LT1s then I will reuse them and put the saved money into new heads.
