CHESTNUTXE

WINDSOR SMALLBLOCK TALK

237 posts in this topic

you can still use the block and stroke it


Yeah that’s probably what I’ll do, unless a good 289 crank turns up...

The block is JG35, rods C8OE, crank is 2M...so yeah all 302.

Are you running EFI in this little beauty?


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it came with all the efi stuff but i only bought it for a rebuild to keep me busy and a learning curve cause im looking for a 351w engine a late model one to do up for myself,and there aint too much out there ,but not impossible,i intend to sell this one then use the cash and go again on the bigger one or even stroker ,one thing thats been bugging me lately is is there any point building a factory 351w cause ya can get a cheap 5.0 block and buy a 347 kit and almost same cubes ???? but we will see i will keep looking for one.

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Yeah the rule of thumb on a few 5.0 forums is the block we’re good for 500hp at the crank....but in saying that a Australian tuning place on Facebook get 550hp at the wheels with no issues out of the 302 block with boost...also depends on the tune and revs.

The other point was that they didn’t like high rpm, I take mine to 6500 a bit once to 7000 and no issues.

The later 351 roller blocks made in the 1990s split the cam tunnels really bad too.

Maybe it’s just luck of the draw with them.

Turns out that the 289 I scored is a 302, much disappointment.


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Not 100% but I gather that HP figure that everyone bounces around is for an atmo engine, meaning to make that figure, you need to spin it to X rpm, which is what would kill the block (ie: harmonics, balancing stresses, etc.) Boosting makes horsepower without the rpm so actual HP wouldn't be so much of a factor.

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Not 100% but I gather that HP figure that everyone bounces around is for an atmo engine, meaning to make that figure, you need to spin it to X rpm, which is what would kill the block (ie: harmonics, balancing stresses, etc.) Boosting makes horsepower without the rpm so actual HP wouldn't be so much of a factor.

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Yeah you would be right, I have read a few articles where the blocks are ok NA with internal balancing (aftermarket steel cranks etc) and spinning them over 7 grand with no issues, so yeah the harmonics must be the main issues.


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gerg and CHESTNUTXE like this

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XR GT's revved to 7,000rpm 50 years ago, with 1967 technology. Should definitely be doable today.
The problem with the roller blocks is they are a lighter casting with a higher nickel content, also its mainly strokers that have the problem, with a stock stroke the seem to be able to handle 7500+ for a while but they are a bit of a time bomb more or less
Not my photos but some examples of broken 5.0 blocks
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NZXD, gerg, CHESTNUTXE and 1 other like this

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I think with my current 302 I might just keep leaning on it and see what happens, if it grenades then it’s a good excuse to build it better.

I wanted the 289 for old school high rpm with big alloy heads and the go fast bits.


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My new pack of 4 roller lifters came as 3 or 4 of the old ones are a bit sus but the others seem good

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ignore " most " of the ancillaries ,,
could/should be a lot neater ,,
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Make sure when you install the dog bones the dot faces up otherwise the lifters can rotate destroying the cam in the process

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Make sure when you install the dog bones the dot faces up otherwise the lifters can rotate destroying the cam in the process
Thom what about which way the lifter goes in as 1 side has a metering hole ?e700a633e45807ff5fca9ecebcc453bb.jpg4d934dac90e46a984bd14bb0434a4fee.jpg

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