350 or 400

hi guy's i have the opportunity to buy a 400ci small block ,now over here in the uk they are like rocking horse poo,i also have a 350 4 bolt that needs a rebuild. now should i purchase the 400 sb, this is a long block all be it stock,i can put rpm heads on it, as well as a performer intake and a new holley street avenger 670cfm i also have a 270 comp cam for it ,the $64000 question is,is the 400 block worth putting in and could it be built better than a 350 advice and some spec required thanks ,martin


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What duty will the motor be asked to perform and on what grade of fuel? Personally, I would go with the 400 block and crank if the block hasn't been bored excessively already. I'll add more after I know the intended purpose. Please list part numbers for all the parts you now have on hand.

^X2 with Tech on this.



Cole

X3 also, I'll take a built 406 over any built 355 .....ANY day. If you've ever ridden in a 66 Nova (like I did once) with a very healthy 406.....well

the motor will be used in a street rod with a little track use ,see my journal,but as always you want it perform good or purposefull should i say thanks for the replies

I would go with the 400 block, but only if not already bored and tampered with. A good built 406 would easily yield 450 hp. But with time and money, a 406 or 421 could GIVE u 500 to 600 HP and just as much tq. I have a sbc 406 that makes 522 horses on a great budget... under $5500.. here is my build..

817 sbc 400 block bored .30
Eagle balanced rotating assembly (10.7) compression
Brodix Ik200 heads
LUNATI voodoo Retro roller 231/239
1.6 Harland Sharpe Roller rockers
Air gap intake
Quick fuel 750 vacuum secondary
Msd ignition
Hooker super comp 1 3/4 long tubes
Turbo 350- 10" 3000 stall
3.73 gears
In a 1985 Monte Carlo

This is actually a very nice engine build to copy, may slightly change the cam but its a pretty good build for off the shelf parts.

I would go with the 400 block, but only if not already bored and tampered with. A good built 406 would easily yield 450 hp. But with time and money, a 406 or 421 could GIVE u 500 to 600 HP and just as much tq. I have a sbc 406 that makes 522 horses on a great budget... under $5500.. here is my build..

817 sbc 400 block bored .30
Eagle balanced rotating assembly (10.7) compression
Brodix Ik200 heads
LUNATI voodoo Retro roller 231/239
1.6 Harland Sharpe Roller rockers
Air gap intake
Quick fuel 750 vacuum secondary
Msd ignition
Hooker super comp 1 3/4 long tubes
Turbo 350- 10" 3000 stall
3.73 gears
In a 1985 Monte Carlo