Technical > Matt Shaff's Engine Shop
The Nostalgic 265 Engine Build
bfalfa55:
I posted this before and was hoping I would get some of your thoughts. I have edited it and put a suggested cam from a Lunati rep. on the phone. Let me know what you think.
http://www.gmperformancemotor.com/parts/10105117.html
I am thinking these gaskets will work well, I just have to get them and make sure they are a match with the areas the original engine owner modified on the top of the cylinder bores. He scalloped areas to match the head gaskets he was going to use. Not the best thing for a little engine like this but they only take away 2cc's away from my compression but that isn't going to hurt me because I will be at 10.5:1 even with them. I am trying to see if I can just get them from a Chevy dealership parts counter in case they aren't compatible.
These will put me at a .043 quench. I also have a porting question for you guys. The flow numbers I have found for L98 Aluminum heads are just about right for this size engine as they are. Should I clean up all through the ports OR just do enough clean up to true up things and take out the imperfections ? I don't want to take away what little low end torque I will have so this is why I ask.
This is the cam I was looking at and ironically it is the exact cam Lunati suggested when I talked to them. Not purchased yet, ordering my gaskets so I can get to porting my heads.
Voodoo Retro-Fit Hydraulic Roller Cam & Lifter Kit - Chevrolet Small Block 270/278
[IMG]
Product Description
Lunati’s Voodoo series of camshafts deliver more area under the curve than any other series of camshafts. This means more throttle response, quicker acceleration, more vacuum and better efficiency. These factors, combined with maximum horsepower and torque, make Voodoo camshafts the perfect choice for a wide range of high performance applications.Retro-Fit Hydraulic Roller. Strong power increase in mildly modified engines with excellent throttle response. Will work with stock converter in 383-up c.i.. Likes 2000 RPM converter in 350 or less c.i. applications. Likes 3.23-3.73 gearing. Largest choice for inboard/outboard marine applications. Has noticeable idle and likes headers.
Advertised Duration (Int/Exh): 270/278
Duration @ .050 (Int/Exh): 219/227
Gross Valve Lift (Int/Exh): .515/.530
LSA/ICL: 112/106
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1800-6000
Includes: Cam & Lifters (#72330-16)
Part Number: 20120711LK
Previous Part Number: 60111LK
Jobber Price: $605.56
jeff/21:
i would do the valve bowls, a good valve job, gasket matching
Roger:
It looks like the head gaskets with the stainless fire ring will work fine with your compression. The camshaft should idle fairly well and make power to 5,500 or even 6,000rpm. While the air flow of those heads look pathetic at first, your stock heads should flow close to the same amount of air needed to feed your 265” engine at .50” lift as a set of stock Dart Pro 1 230cc heads flow to feed a 383” engine. I say put it together with the parts you have using the cam you quoted and let us know how it runs.
bfalfa55:
Alright engine gurus, how close to the bore should the fire ring of your head gasket be to the bore ? Due to the scalloped shapes at the top of my bores, the head gaskets I bought are right at the edge of them. I don't have a picture at the moment but thought I would ask first. I may be limited to a certain bore/combustion chamber shape since this was done to the block, so it brings up another question: How thin of a had gasket can I run with aluminum heads ?
ricardo1967:
--- Quote from: bfalfa55 on September 27, 2016, 04:12:57 PM ---Alright engine gurus, how close to the bore should the fire ring of your head gasket be to the bore ? Due to the scalloped shapes at the top of my bores, the head gaskets I bought are right at the edge of them. I don't have a picture at the moment but thought I would ask first. I may be limited to a certain bore/combustion chamber shape since this was done to the block, so it brings up another question: How thin of a had gasket can I run with aluminum heads ?
--- End quote ---
1) I've always considered OK as long the fire ring doesn't overhang into the cylinder bore.
2) In my mind, minimum thickness is closely depended on gasket type (composite, steel shim, MLS, copper, ...), not cylinder head material.
Now let's hear the pros.
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