Building a stroker on an old block?
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Racer
Joined: Sep 2000
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Building a stroker on an old block?
I am planning on building me a 383 from an old block (69). Since money is an issue (as always) I want to do it step by step.
First I am going to stroke it. Putting in all forged parts. Then I will drop that old block in my 1991 Vette. Put my old TPI and heads on top of it. I will put in a 74219 camshaft because I know I will upgrade to a Superram later.
Questions are:
1) Can I use my old heads (from the L98) on the new (old 1969) block?
2) What about compression ratio? When I decide can afford) to change to aftermarket heads will I find some with 58cc combustion chambers? Is it better to optimize the bottom end for bigger combustion chambers at once?
3) Will the Superram with base fit on the old block (1969)?
Thanks in advance.
:cheers: :cheers:
First I am going to stroke it. Putting in all forged parts. Then I will drop that old block in my 1991 Vette. Put my old TPI and heads on top of it. I will put in a 74219 camshaft because I know I will upgrade to a Superram later.
Questions are:
1) Can I use my old heads (from the L98) on the new (old 1969) block?
2) What about compression ratio? When I decide can afford) to change to aftermarket heads will I find some with 58cc combustion chambers? Is it better to optimize the bottom end for bigger combustion chambers at once?
3) Will the Superram with base fit on the old block (1969)?
Thanks in advance.
:cheers: :cheers:
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Re: Building a stroker on an old block? (Cratzy)
L98 is just a typical SBC, everything should bolt up fine.
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Re: Building a stroker on an old block? (Cratzy)
Because of the amount of power possible with the 383, and overall expense, I would make sure that the 69 block is a sound block. Have you had it crack tested or anything? If your heads are aluminum I would port them and the intake runners and you should be fine. That would put you up to around 183cc. Then later maybe upgrade to APR 195s. I'm not sure about the specs on a Superram, but there are plenty of more knowledgable people on this than me in this forum.
Thread Starter
Racer
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Re: Building a stroker on an old block? (castivers)
Thanks for the answers. :)
I haven't had it crack tested; I bought it from a friend though... :eek:
I am going to port my heads and when I can afford AFR heads I will upgrade, but what about compression ratio? If I chose pistons for my present heads (58cc) and change to new heads I will have to chose heads with 58cc combustion chambers or put in other pistons if I want heads with bigger chambers... or? :confused:
BR
:cheers:
I haven't had it crack tested; I bought it from a friend though... :eek:
I am going to port my heads and when I can afford AFR heads I will upgrade, but what about compression ratio? If I chose pistons for my present heads (58cc) and change to new heads I will have to chose heads with 58cc combustion chambers or put in other pistons if I want heads with bigger chambers... or? :confused:
BR
:cheers:
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Re: Building a stroker on an old block? (Cratzy)
Since you are going all forged components you will be replacing the pistons. If you know what compression ratio you want, you need to know the desired stroke 3.75 with a 383. You will need to know the CC of the heads, the thickness of the head gasket and any dish/dome on the piston.
You can build it to have whatever compression you want. I would call SRP and tell them what you've got and what you want for compression, they will be able to help you pick out a piston.
You can build it to have whatever compression you want. I would call SRP and tell them what you've got and what you want for compression, they will be able to help you pick out a piston.
Team Owner
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Re: Building a stroker on an old block? (Cratzy)
You need to set a compression ratio to shoot for to select pistons, and know what heads youre gonna possibly change too so you dont go too high
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Racer
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Re: Building a stroker on an old block? (vader86)
I haven't decided on what heads I am going to go with, but I think AFR.
What difference does the size of the combustion chambers make? If it doesn't matter what sizes they are perhaps I can just find a pair of heads with 58cc or as close as possible?
:confused: :confused:
:cheers:
What difference does the size of the combustion chambers make? If it doesn't matter what sizes they are perhaps I can just find a pair of heads with 58cc or as close as possible?
:confused: :confused:
:cheers:
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I will put in a 74219 camshaft because I know I will upgrade to a Superram later.
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Re: Building a stroker on an old block? (Cratzy)
A 64 cc head will have less compression than a 58 cc head will. Also a dished piston will less compression than a flat top or domed piston.
It's all about volume before and after. By that though if you currently have 64 cc heads and have X for compression, you can still obtain X compression with a 58 cc head but you will need a thicker head gasket or more of a dish on the piston.
It's all about volume before and after. By that though if you currently have 64 cc heads and have X for compression, you can still obtain X compression with a 58 cc head but you will need a thicker head gasket or more of a dish on the piston.
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Re: Building a stroker on an old block? (Cratzy)
I haven't decided on what heads I am going to go with, but I think AFR.
What difference does the size of the combustion chambers make? If it doesn't matter what sizes they are perhaps I can just find a pair of heads with 58cc or as close as possible?
What difference does the size of the combustion chambers make? If it doesn't matter what sizes they are perhaps I can just find a pair of heads with 58cc or as close as possible?
Pro
Joined: Jan 2001
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From: Newton (Wichita Area) Kansas
Re: (scorp508)
I will put in a 74219 camshaft because I know I will upgrade to a Superram later.
Keep in mind that if you do not use a rollerblock to begin with you will have more work/parts to do to be able to use the 219 in it.
Keep in mind that if you do not use a rollerblock to begin with you will have more work/parts to do to be able to use the 219 in it.
This is where a hyd retro roller cam would be a good fit. They don't use that retainer and drop right into older blocks. The bad part is they're $1000 for and they're on back order.
I'd consider getting a custom hyd flat tappet grind from Comp Cams with specs similar to the LPE 74219 cam.
[Modified by jmr302, 1:50 PM 9/10/2002]
Thread Starter
Racer
Joined: Sep 2000
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Re: (jmr302)
Thank you for all the answers :)
I will have this topic printed so that I can have a look at it when I start buildning my new engine :)
What is the specs of the 74219?
What about install a set of retro-fit hydraulic roller lifters? I have heard that something like that is available from Crane or Comp Cams?
:cheers: :cheers:
[Modified by Cratzy, 7:58 AM 9/11/2002]
I will have this topic printed so that I can have a look at it when I start buildning my new engine :)
I'd consider getting a custom hyd flat tappet grind from Comp Cams with specs similar to the LPE 74219 cam.
What about install a set of retro-fit hydraulic roller lifters? I have heard that something like that is available from Crane or Comp Cams?
:cheers: :cheers:
[Modified by Cratzy, 7:58 AM 9/11/2002]
Pro
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From: Newton (Wichita Area) Kansas
Re: (Cratzy)
The LPE 74219 cam has 219*/219* dur at .050" lift. Also .560"/.560" max lift with 1.6 rockers. Most importantly the LSA = 112. You may not be able to get the same max lift in a hyd flat tappet because they can't have ramps as steep as roller cams.
Like I said before, Comp Cams retro-roller lifters are on back order. Production hasn't been able to keep up with demand. Also the cams are $400 and the lifters are $600 from Summit. I believe you only need a cam thrust button and shorter pushrods to run that setup. I'd find a roller cam block to work with or just stick with hyd flat tappets.
Like I said before, Comp Cams retro-roller lifters are on back order. Production hasn't been able to keep up with demand. Also the cams are $400 and the lifters are $600 from Summit. I believe you only need a cam thrust button and shorter pushrods to run that setup. I'd find a roller cam block to work with or just stick with hyd flat tappets.