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Can i stroke my 290?

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Hurst390 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst390 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/29/2021 at 6:26am
Grind the 360 off the block and put 290 in its place..a little plaster of paris and your off to the races. A heck of alot cheaper than throwing money at something with limited return. Cubic inches is free horsepower. The parts all cost the same.

Edited by Hurst390 - Jan/29/2021 at 6:28am
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WesternRed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Jan/29/2021 at 8:47am
I sort of know somebody who did really well in the local speedway racing for many years with AMC engines. I always wondered if it was because you could fit a 401 crank in a 360 block (360 ci limit) and hopefully nobody would do a swept volume check.
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Trader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Jan/29/2021 at 9:22am
Oh I do agree Hurst about the CI and HP.
I differ on the original post wanting to stroke a 290, not much to gain from stroking it.
In fact, if you work the numbers, put a 290 crankshaft in the 360 - a TA type motor with more CI. It will happily rev at a constant 7000 RPM all day long with the same 360 upgrade parts, more HP, and costs the same as trying to get equivalent HP out of a 360 that your pushing the edge on piston velocity to survive.
More stroke means less RPM and yes more CI.
The question would be at what point do you spend $ on CI over RPM to obtain a given HP.
I'm just proposing that there is 2 ways to look at the posters question. I believe that if you want to keep the 290, the RPM option is the best route to power.

Edit, Hurst is correct CI make a huge difference, bore the 290 to durability, install a 304 head with Chev 307 valves. 304 heads, pistons and rods for 8000 RPM opens all the affordable options for the 360 aftermarket parts.
But the 290 short stroke offers RPM that a stock 304, 360, 401 do not.
A 290 with ported 304 heads (see JCISWorthy Threads) with Chev 307 valves delivers HP that is actually quite astonishing by the math with the right cam.

To the posters question, boring a 290 with a modern cam and pistons with quench will provide more HP then you will ever see with just increasing the stroke for less $$$.


Edited by Trader - Jan/29/2021 at 10:42pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Skwishy Quote  Post ReplyReply Direct Link To This Post Posted: Feb/06/2021 at 12:01pm
Thank you for the advice, everyone really. 
I have decided that i will look for a 360 block to do what i want to do. I will probably sell the 290 on here as i am sure there are plenty of people who would like to have one. 
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