Technical > Matt Shaff's Engine Shop

The Nostalgic 265 Engine Build

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bfalfa55:
I reordered my gaskets and will have to run a 4.125 bore, .039 gasket. This will give me a .054 quench and 10.15:1 comp. Taking .010 more off the block will put me at .044 and right about 10.5:1. I don't know if doing that is worth it or not for the effort. Thoughts ?

Roger:
The block I just had machined measured 9.025” height stock. Add that with a stock .039” gasket and the quench from Chevrolet is .064” and they run fine. No reason it wouldn’t work with what you have, unless the deck surface isn’t flat. Unless you use some poor quality gas detonation shouldn’t be a problem I would think at that compression ratio.

Or spend about $150 to surface the block and use your gaskets. Milling adds about .35 point of compression which adds about 3 HP on a 300 HP engine. Check it out at this website. (Results are not absolute but it puts you in the ballpark)

http://www.wallaceracing.com/hp-cr-chg.php

Or if your deck surface is flat spend about $150 on some Cometic MLS gaskets with a 4.100” or 4.125” bore and .030” thick to end up with a .045 quench.

bfalfa55:
Thanks Roger, that is what I was hoping to hear. The block has already been decked flat and I got my data from the same calculator from Wallace Racing ! I have been using a number of their stuff online, it seems to be pretty good, better and more consistent than some of the others I have seen and used. If I was trying to squeak out every ounce of juice for a race engine, I might do it. But this being more of a double duty engine, I don't mind some of the trades offs for a little street driving.

bfalfa55:
Based on where my cam RPM range is 2,300-6,300 RPM, .218/.228 duration @ .050, .503/.503 lift. 112 LSA hydraulic roller, do any of you think I will benefit from an X pipe or an H pipe in my 2 1/4 inch exhaust system ? I read some conflicting information as to how it may benefit or hurt my little 265. I would like to hear your suggestions or if you think it isn't worth the effort at all.

Frontenginedragsters:
 I don't have an opinion on the exhaust cross over.
I know this will open up a new slew of peoples opinion's but.......
I don't think that camshaft is going to make any power past 5000 RPM.
Now most of the small engines we dyno are 302 ci and bigger.

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