302 Cleveland

Swordie · 25-05-2006, 02:51 PM

Is the 302 Cleveland fitted to an XE any good? Is 350 - 400HP is your aim what 's the best thing to do? Is it better to replace with a 351?

brenx · 25-05-2006, 02:54 PM

starting with a 351 is a better option torque wise but there is no reason a 302 can't make 350-400hp. Decent headwork, camshaft, inlet manifold, exhaust and carb will set you on your way easy.

Black XR6 · 25-05-2006, 04:40 PM

If you have a 302 thats fine, it isnt hard to turn that into a 351 anyway and go from there.

RspecAU · 26-05-2006, 12:47 AM

You can stroke the 302 with the 351 crank shaft

red_hotxr6 · 26-05-2006, 07:03 AM

I notice when you guys do any modifications to a car you all ways seem to do a cam, lots of head work, extractors etc etc. Why is it you never seem to do any thing with the block,? why dont you bore it out and put bigger pistons in. Wouldnt that give you more/instant power.?

94Mustang · 26-05-2006, 08:12 AM

Quote:

Originally Posted by red_hotxr6

I notice when you guys do any modifications to a car you all ways seem to do a cam, lots of head work, extractors etc etc. Why is it you never seem to do any thing with the block,? why dont you bore it out and put bigger pistons in. Wouldnt that give you more/instant power.?

Increasing the bore reduces the block's strength and really there isn't much cubic capacity to gain. Usually when you choose an engine you are stuck that size bore. Next is to increase the stroke, like from going for a 302 to a 351. After you have done that, then attack the smaller items like cam, inlet manifold, exhaust, fuel delivery, etc.

For the original post, I've always thought XD and XEs and 460BB go together.

On the topic of big blocks, check out this 21.5 litre 4cyl.

red_hotxr6 · 26-05-2006, 12:31 PM

Quote:

Originally Posted by 94Mustang

Increasing the bore reduces the block's strength and really there isn't much cubic capacity to gain. Usually when you choose an engine you are stuck that size bore. Next is to increase the stroke, like from going for a 302 to a 351. After you have done that, then attack the smaller items like cam, inlet manifold, exhaust, fuel delivery, etc.

For the original post, I've always thought XD and XEs and 460BB go together.

On the topic of big blocks, check out this 21.5 litre 4cyl.

Wouldnt that only apply to racing the car/engine.Not for every day use.?

brenx · 26-05-2006, 05:23 PM

Quote:

Originally Posted by red_hotxr6

Wouldnt that only apply to racing the car/engine.Not for every day use.?

no. It applies to any engine.

red_hotxr6 · 26-05-2006, 06:39 PM

So what is the difference between a factory 302 and a factory 351 block.? Is there more "metal/engine" there in a 351.?

brenx · 26-05-2006, 06:49 PM

Quote:

Originally Posted by red_hotxr6

So what is the difference between a factory 302 and a factory 351 block.? Is there more "metal/engine" there in a 351.?

Nothing they are identical. 302 has a 4" bore and 3" stroke. 351 has a 4" bore and 3.5" stroke.

Black XR6 · 26-05-2006, 06:50 PM

engines are engines they are the same principals

**Falcon Coupe** · 26-05-2006, 07:17 PM

Quote:

Originally Posted by red_hotxr6

So what is the difference between a factory 302 and a factory 351 block.? Is there more "metal/engine" there in a 351.?

I got hold of a 302 vigin bore, it's about to become a 393, still 30" overbore the capacity increase is due to stroking, and the block will be half groutfilled to increase it's strength.

Falchoon · 26-05-2006, 09:36 PM

Quote:

Originally Posted by red_hotxr6

So what is the difference between a factory 302 and a factory 351 block.? Is there more "metal/engine" there in a 351.?

Same engine, just different crank and rods. 302 was unique to Australia. Should be able to pick up 351 crank & rods for around $500 if you look around. I reckon this would have to be one of the best bang-for-your-buck power upgrades you could do. 302 and 351 heads are exactly the same except for the combustion chambers (smaller for 302), which will raise the compression probably too high for pump petrol. Need to find some open chamber 351 heads or get your 302 ones modified. I used to run 302 closed chamber heads on my 351 XY but it used to run on sometimes and ping occasionally - this was back in the days of "Super" leaded petrol. Engine used to run quite hot too, ok while cruising but in traffic it overheated with a triple core radiator, fan shroud, heavy duty Fairlane flexi fan and a thermo. The 302 used to keep cool with standard 6 cyl radiator.