'74 F-100

hey everyone, will a stock 351 backed with a c6 hold its own against a 390 with a c6? or will the 390 take it all the way? i hear that the 351 and the 400 are basically the same motor. no gas mileage difference and hardly any power difference. but how does the 390 do against these motors?????

Ford Grunt

Hey mate, if your talking about the 351/400 Cleveland they are different blocks. The 302/351 share the same blocks but the 400 is a different engine.

The 302/351 block can only at max be stoked to 388 (or so, give a few CIs).

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Jikbo

I know this is off the original point, but I saw a 351 bored and stroked out to a 427. It was in Streetmachine(I think) about a year or two ago. The engine was in a grey cortina. Apparantly the pistons nearly come out of the bores but it was a kick arse engine. As to why he didnt just slip a big block in, I don't know, just being different I suppose.

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Jikbo
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"I intend to live for ever, so far so good."

LMF

the 390 would wup em

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1973 F-100 Custom w/360 w/3 on tree. FREEBIE!

outback_ute

You can do that with a 351W I believe, but you would want to check the block carefully first.

Rhett

408 is about the limit for a Cleveland using a factory block, (427 using a factory 351W block). Aftermarket blocks (9.5" deck height) can get a little over 450 because they can be overbored quite a lot.

The 400 sounds like a great way to make cheap HP and heaps of torque. I know they are everywhere in the US and a dime a dozen. Most of the 351/302C bits will bolt straight on. I wish I could find someone here in OZ who imported rebuilders for a reasonable price, as I recon one would slide straight into my XE's engine bay.

TOPXR

how r ya mate. 390 is a top engine, strong as hell, and as heavy as too. comparing all motors in as stock condition the 390 and 351 are fairly close on hp but 390 wins slightly on tq. power and tq are at lower revs in the 390 than 351. in an f100 the 390 will slightly out do a 351(talking clevo here) but the 351 will catch it as revs and speed rise. 400 clevo block is different to 351. 400 has larger bearings longer rods and aprox 1 inch taller deck(block) height. all 400's came with 2bl carb but had huge tq. , over 400ft/lb's. in an f100 a 2bl 400 will way out tq a 390 or 351. fit a 4bl intake to the 400 to up the hp and the 351 and 390 will not even come close. 400clevo's share the basic gasket set, heads, sump, cam and timing set, oil pump and a few other bits with the 351. there is a 351 that uses the same block as the 400, this is called the 351m ( m stands for modified, from normal 351c) it has same bearing sizes as 400 but same stroke as 351c. (351. 4"bore/3.5"stroke. 400. 4"bore/4"stroke) some refer to the 400 as the 400m, this is incorrect. it is a 400 cleveland. give me an email if ya want any more info. cheers.

ford_fe

You will find it pretty hard to find much in the way of performance parts for the 400 whereas the 390 there is plenty in both OEM & after market.