SBC 383 or 400-406 ci

[v8 jago]

Im trying to find the best engine combo that would suit me for power, Strength and in the pocket. I have now got a 6-71 blower lined up to go with my AFR227sp heads. I have been looking for a 400 or 406 ci engine and have trying to find out some info on the two engines and ive read that 400+ block suffer from heat and are not as strong but been told the extra cubes make the diffrence and they are worth buying Can i have some advice on the two engines and if they are much diffrence on strength and power and just wondering if my heads would fit on a 4" bore or would i need the 4.125" bore.
Also im struggling to find a 400 block for the right price and would even concider one with all the internals in if it was forged and low compression. Has anyone got any links to any for sale. (please)

[BB-Q]

v8 jago said:

Im trying to find the best engine combo that would suit me for power, Strength and in the pocket. I have now got a 6-71 blower lined up to go with my AFR227sp heads. I have been looking for a 400 or 406 ci engine and have trying to find out some info on the two engines and ive read that 400+ block suffer from heat and are not as strong but been told the extra cubes make the diffrence and they are worth buying Can i have some advice on the two engines and if they are much diffrence on strength and power and just wondering if my heads would fit on a 4" bore or would i need the 4.125" bore.
Also im struggling to find a 400 block for the right price and would even concider one with all the internals in if it was forged and low compression. Has anyone got any links to any for sale. (please)

I have no idea on these engines but would just like to point out a saying I hear a lot on another forum. "why worry about a few extra cc's- it's a couple of extra pounds of boost". You have to calculate the £/power ratio to see if it's worth it compared to going down another avenue for your power.

I know in drag racing we are going for the ultimate power output but there always has to be compromises.

By the way- what's your chassis going to think of all this extra torque?

[v8 jago]

BB-Q said:

By the way- what's your chassis going to think of all this extra torque?

I think my chassis has give up thinking whats going through it. As long as it doesnt start creaking or groaning it should be ok. (I hope)

[fastco]

Hello...........go 400 SBC... why free valve unshrouding...4.125 bore VS 4.00 bore of 350. = better flow'n engine / free BHP.. also there is NO replacement for DISPLACEMENT....
No problem with 400 SBC blocks ...we've got plenty.. USE 2 bolt block with splayed 4 bolt cap conversion... good to 700 + BHP... prep'd right.
Cheers! DR,Dee

[marT350T]

Your going for a blown SBC now mate eh ?

Do you think that you will get this all up and running over the winter ? If you need a hand with anything give me a shout .

[PhilSweeney]

don't bother with the 400 block or the 6/71. You'll end up with a weak and rare starting point for a block and a blower you need to spin high to get decent boost.

If your sold on small block, then a Motown block is your best starting point, but personally I'd go for a 454cu in big block if you can, 4 bolt mains with a 8/71 blower and you'll have torque the 400 could never have made at a lower rpm and without spinning the blower high.

[v8 jago]

marT350T said:

If you need a hand with anything give me a shout .

Ok then Just get me all the freebies and the big discounted parts you have managed to get yourself And i would have a near free engine

[v8 jago]

PhilSweeney said:

don't bother with the 400 block or the 6/71. You'll end up with a weak and rare starting point for a block and a blower you need to spin high to get decent boost.

If your sold on small block, then a Motown block is your best starting point, but personally I'd go for a 454cu in big block if you can, 4 bolt mains with a 8/71 blower and you'll have torque the 400 could never have made at a lower rpm and without spinning the blower high.

Unfortualtly i wouldnt get a bbc in my jeep, A few people have said to get a 383 4 bolt with a good roller cam steel crank, H beams and forged pistons and that 6-71 and that should do the job nicley (I hope) Im only looking for about 600hp and been able to run mid 9s if at all possible.

[marT350T]

v8 jago said:

marT350T said:

If you need a hand with anything give me a shout .

Ok then Just get me all the freebies and the big discounted parts you have managed to get yourself And i would have a near free engine

Its quite easy to do just write a few cheeky emails and hope for the best. Im sure that you could a few companies on board.

The best way is to get your jago in a magazine then you shoud have no bother.

[v8 jago]

Only thing is in most peoples eyes its only a jago jeep and not many people are bothered about them and its a funny thing to race. It neither here nor there. If there was a mag called scruffy oddball jeeps i think i might fit the description

[veryoldfart]

v8 jago said:

Only thing is in most peoples eyes its only a jago jeep and not many people are bothered about them and its a funny thing to race. It neither here nor there. If there was a mag called scruffy oddball jeeps i think i might fit the description

look up "svante ericsson, hemi jeep" - yeah baby!

[marT350T]

v8 jago said:

Only thing is in most peoples eyes its only a jago jeep and not many people are bothered about them and its a funny thing to race. It neither here nor there. If there was a mag called scruffy oddball jeeps i think i might fit the description

To me thats its biggest asset. Its only a Jago Jeep, but with a RV8 doing 10s on its back wheels or with a blown SBC doing 9s (maybe) it makes more people take notice.
Its different so its more appealing in my eyes.

[dbv8]

marT350T said:

To me thats its biggest asset. Its only a Jago Jeep, but with a RV8 doing 10s on its back wheels or with a blown SBC doing 9s (maybe) it makes more people take notice.
Its different so its more appealing in my eyes.

+1

[Furyous]

v8 jago said:

Only thing is in most peoples eyes its only a jago jeep and not many people are bothered about them and its a funny thing to race. It neither here nor there. If there was a mag called scruffy oddball phastasphuck jeeps i think i might fit the description

EFA

[v8 jago]

veryoldfart said:

v8 jago said:

Only thing is in most peoples eyes its only a jago jeep and not many people are bothered about them and its a funny thing to race. It neither here nor there. If there was a mag called scruffy oddball jeeps i think i might fit the description

look up "svante ericsson, hemi jeep" - yeah baby!

Is that the green one that used to drive over from sweeden or similar place, unfasten his slicks from on the back of the jeep swap them with the road tyres and race ! Winning by a couple of seconds and getting put in a dragster class because people were complaining it was too quick.. Pure genius. Ive got 2 or 3 photos of it. Looks similar to mine with no screen and quite a lot longer..
What times did it run ?? Even all those years back i know it was very impressive. Cool guy

[veryoldfart]

it was indeed, the stuff of legend, pure maniac days....lol

had to run in a comp bracket as it devoured any street cars.


times into the 9's i recall

http://www.trakbytes.co.uk/

http://www.theaccelerationarchive.co.uk/

http://race68.com/svante.htm

[v8 jago]

I Thats the beast.

[eliot]

Get a good 4 bolt 350 block and drop a forged 383 rotating assly in it. Avoid the 400 block IMO, as its rare and unusual in the UK.
If you have an issue, getting another 350 block is much easier - as opposed to the 400.

[veryoldfart]

as it stands it must be quite light yes?

what was its donor vehicle, mk3 cortina?

you could go down the 4 cyl route...cossie...



(or a bloody good tdi!)

[revolvor]

dbv8 said:

marT350T said:

To me thats its biggest asset. Its only a Jago Jeep, but with a RV8 doing 10s on its back wheels or with a blown SBC doing 9s (maybe) it makes more people take notice.
Its different so its more appealing in my eyes.

+1

Agreed - It's as original as a fibreglass 32 coupe - if I wrote this on the NSRA forum though it would not go down well