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post #1 of 4 (permalink) Old 01-30-2013, 10:36 AM Thread Starter
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FE engine blocks

I'm trying to get a relative idea of engine block strength for the FE motors.

This is what i understand thus far.

In order of weakest to strongest.
Early 352/390
Later 390
428 service block

I'm considering building a forced induction engine (turbo)
So what i'm wondering is how much power will the mains on these engines support? 352/390 seems to be 500hp ish when people start moving on... and 600-650 for the 428 but then it seems like everyone jumps ship to the huge 4 bolt blocks from there... i guess because there aren't many forced induction FE engines everyone worries about the RPM and rotating weight shaking the thing apart or the displacement capacity for the block. What would a mild cammed 6000rpm 390-410 with inter-cooled boost break these blocks at? the 2-bolt 351s seem to be fine at 10 psi and 700hp... one would think even the weakest FE would be stronger then a 2 bolt main 351.... right?

Basically... i'm trying to figure out if i need the expense of a 5 grand block for an 800hp low boost hydro cammed FE

Last edited by sumfoo1; 01-30-2013 at 10:41 AM.
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post #2 of 4 (permalink) Old 02-10-2013, 07:25 AM
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Re: FE engine blocks

I am building a '67 390 stroker. I am putting in a Scat 431 kit. It only requires .30 over the stock bore dimension. The cam selection and valve train i will be installing should push me in the 500hp range. The largest amount of feedback I have gotten form people that raced 390's in the 60's and 70's has been that cooling will be my major issue. I will be running a 4 core downflow 5/8 tube radiator. SOME of the 390's and most 428's as well as most if not all 427's had cross bolted mains. They may be your best choice.
Just a thought.

1967 Galaxie Fact. XL "Z" code (390-soon 445cid) C-6,A/C, P/S,P/B (K/H disc),Fact.Tinted glass
1967 Gal. Complete parts car
84 Grand Wagoneer, 94 Grand Cherokee Ltd.,2000 FLSTF,2012 FLHX
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post #3 of 4 (permalink) Old 02-10-2013, 07:51 AM
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Re: FE engine blocks

Have you looked into a FT 391 block? Same dimensions as a FE 390 (same bellhousing, engine mounts, accessories) but with stronger oiling system and a hole drilled into the side for extra oil drain back. All are made of stronger iron and most have extra webs and ribs for the crank.

They came in medium and heavy trucks but not sure how many were made.

To every man upon this earth
Death cometh soon or late.

Putts drives a 1965 Galaxie. Rebuilt 390, 4100 on a Performer, MX, AC, PS, PB w Scarebird front discs on Cragar 17" S/S.
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post #4 of 4 (permalink) Old 02-13-2013, 05:43 AM Thread Starter
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FE engine blocks

Ended up saying screw it and going full on Robert pond aluminum block....

Should shed almost 300 lbs off the front between aluminum engine and t-6060 vs all iron 352 and cruiseOmatic.

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