383 Stroker build question
Thread Starter
TECH Fanatic
Joined: Aug 2008
Posts: 1,740
Likes: 2
From: Nebraska
383 Stroker build question I have a 93 Formula LT1 M6 and I'm planning a 383 stroker build for it.
My question is if the stock 1.94" Intake/1.50" exhaust valves are enough flow for a N/A 383 that I want to build or do i need to upgrade to 2.02"/1.60" valves for this build?
Please help
My question is if the stock 1.94" Intake/1.50" exhaust valves are enough flow for a N/A 383 that I want to build or do i need to upgrade to 2.02"/1.60" valves for this build?
Please help
If you think valve size is THE BIG concern in a head then you will not pull off a good build.
Few people bother with 2.02/1.6 valves in the LT1 heads because it takres a LOT of extra work and money for no proven gain over the very popular 2.00/1.56 that is usually used with porting.
The porting is what is KEY it is MORE important than the stroker crank when it comes to making power. If you can't afford GOOD heads and GOOD rotating parts skip the rotating parts for now. The stock shortblock can make a lot of power with a good heads and cam package like.
https://ls1tech.com/forums/lt1-lt4-m...-purchase.html
Few people bother with 2.02/1.6 valves in the LT1 heads because it takres a LOT of extra work and money for no proven gain over the very popular 2.00/1.56 that is usually used with porting.
The porting is what is KEY it is MORE important than the stroker crank when it comes to making power. If you can't afford GOOD heads and GOOD rotating parts skip the rotating parts for now. The stock shortblock can make a lot of power with a good heads and cam package like.
https://ls1tech.com/forums/lt1-lt4-m...-purchase.html
Thread Starter
TECH Fanatic
Joined: Aug 2008
Posts: 1,740
Likes: 2
From: Nebraska
Ok thanks guys, Any Cam ideas for my build?
My plans are:
Forged Scat H beam 6 in" rods
Stock ported heads Not sure on valve size?
Scat Forged 3.75 Crank
Forged Keith Black Flat top pistons
ARP studded everything
Splayed 4 bolt Caps
36lb injectors
52 mm TB
Edelbrock Intake
Comp 1.6 rockers
Edelbrock shorties
Magnaflow catback
My goal is a streetable 383 with a choppy idle and roughly 400-450 HP.
I drive my Formula almost every day so i want it streetable.
Please leave your imput and give me ideas and some constructive criticism
My plans are:
Forged Scat H beam 6 in" rods
Stock ported heads Not sure on valve size?
Scat Forged 3.75 Crank
Forged Keith Black Flat top pistons
ARP studded everything
Splayed 4 bolt Caps
36lb injectors
52 mm TB
Edelbrock Intake
Comp 1.6 rockers
Edelbrock shorties
Magnaflow catback
My goal is a streetable 383 with a choppy idle and roughly 400-450 HP.
I drive my Formula almost every day so i want it streetable.
Please leave your imput and give me ideas and some constructive criticism
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TECH Fanatic
Joined: Aug 2008
Posts: 1,740
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From: Nebraska
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Joined: Mar 2009
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From: Clearwater
splayed caps might be an unnecessary expense, it really depends on whom you ask since its a DD you might never push it to that limit. does the edelbrock intake you are referring to happen to be the air gap? the smaller plenum volume seemed to eliminate the vaccuum issues i had (as opposed to a really well sealed stocker) from using a GM847 but in terms of performance i think it serves more as eye candy than a power adder. mine was free with the heads i bought so no complaints about wasted funds here 
. i do love my pace setter long tubes. spring for the coated ones. the magnaflow catback sounds great on my car plus it is stainless.
. i do love my pace setter long tubes. spring for the coated ones. the magnaflow catback sounds great on my car plus it is stainless. Thread Starter
TECH Fanatic
Joined: Aug 2008
Posts: 1,740
Likes: 2
From: Nebraska
splayed caps might be an unnecessary expense, it really depends on whom you ask since its a DD you might never push it to that limit. does the edelbrock intake you are referring to happen to be the air gap? the smaller plenum volume seemed to eliminate the vaccuum issues i had (as opposed to a really well sealed stocker) from using a GM847 but in terms of performance i think it serves more as eye candy than a power adder. mine was free with the heads i bought so no complaints about wasted funds here . i do love my pace setter long tubes. spring for the coated ones. the magnaflow catback sounds great on my car plus it is stainless.
. i do love my pace setter long tubes. spring for the coated ones. the magnaflow catback sounds great on my car plus it is stainless.I was set on Pacesetters because I saw how well they fit on my uncles 93 Z28 and he has Magnaflow and it sounds BA!
not trying to hijack the thread but I am curious about what was said earlier about cams, is it true that you can get away with a larger cam in a 383 and still pass emissions? I thought that if you went with more duration your valve overlap would allow unburnt fuel to pass through you exhaust valve before it hits the seat and that was the biggest contributor to the larger cams not being emissions friendly? Someone please shed some light on this if I am backwards. I am building a new engine as we speak and was planning on sticking with the same cam but if I can go a little larger and still pass emissions I would love to.
JB, you're on the right path. The reason the larger motor will produce less emissions is because of the increased hang time at BDC that the piston will have. So, if you have the same cam specs but a longer stroke the piston will linger at the bottom of the cylinder longer in the cycle while the big end of the rod takes the 3.75in stroke trip in a 360* rotation vs. the much shorter 3.48in. Because piston speed is increased with the longer stroke the cam will act different in the cycle because your valves wont be able to evacuate the exhaust as quickly and the valve will shut before it can.