B Block or RB Block for 500 ci build

[68 HEMI GTS]

Yes 950 QF
40 shooters
50 pumps
88’s
96’s

Be pretty easy to swap that main body to a 1050 unit. The pro forms are QFT castings. Your actually jeted fatter than I run my 1050.

 

[m79ded]

When we built my 451, we noticed the block had been decked in a big way - pistons should have been like 0.017 in the hole but were 0.003 out. We just used cometic gaskets to make up the difference. Worked great.

Far as journal strength... who here as ever seen a cap or journal blasted out the bottom of a 440? I dunno, seems to me main studs and decent rods are all that’s needed? Even 700HP motors are never really exposing their bottom ends to all 700HP unless they’re racing... and that’s for seconds at a time.

Thanks that is a great idea I will look into .051 headgaskets for my TFS240 instead of .039

 

[5.7 hemi]

I also use .051 head gaskets.

 

[m79ded]

View attachment 556855 View attachment 556856 View attachment 556857 View attachment 556859
Low deck 500Ci scat crank wiesco pistons and k1 rods. trick flow 270 heads, bullet solid roller. best to date 11.32@120mph. in my 3900lb coronet.

love it it's awesome I'm starting to get excited about 512 b engine

 

[Xp29h]

Another vote for "B"

Go 400 block and stroke the heck out of it!

 

[1967coronet440]

If you build a combo thats powerful enough to blow out a 440 block, don’t you think it’ll have the same fate in a 400? I realize the 400 has the thicker webbing etc. in all reality what’s that gonna get ya, a few more passes? Curious what you guys think.

 

[m79ded]

If you build a combo thats powerful enough to blow out a 440 block, don’t you think it’ll have the same fate in a 400? I realize the 400 has the thicker webbing etc. in all reality what’s that gonna get ya, a few more passes? Curious what you guys think.

Well whay I want as well as all of us on this site is a reliable engine. Like most of us we do drive them on the street and will get driven hard as well. It will not live life 1/4 mile at a time. I was somewhat concerned about the B engine but after the reply from so many great people I seem to be more at ease that it's not the end of the world. Yes an RB based engine might go longer between freshen ups but the B seems not bad. Was concerned about overheating as well dur to added friction, but so far no mention of heating issues.What I've seen up to 650-675 HP you're ok with either block then add a girdle to it or get aftermarket block

 

[1967coronet440]

Yes in a street engine either will be fine, In more of a race orientated does it really matter? I think if you have a combo that’ll blow out a RB block, a B block doesn’t stand much of a chance either. Looking for input from everyone on that.

 

[Don Chapel]

View attachment 556855 View attachment 556856 View attachment 556857 View attachment 556859
Low deck 500Ci scat crank wiesco pistons and k1 rods. trick flow 270 heads, bullet solid roller. best to date 11.32@120mph. in my 3900lb coronet.

What intake is that your using for the trickflow 270s?

 

[383man]

As said either will work in a street car. Many feel if you go over about 650 hp then you should go with the slightly stronger 400 or an aftermarket block. Myself I went with a 440 block when I built my 493 in my 63 Sport Fury. I knew it was going to be a street car I only race once or twice a year and I don't street race it so its not run real hard that much. And I knew my build was going to be about 600 hp at the flywheel. I also may go to a crossram intake one day which is another reason I went with the 440 block. I don't run a bottom end girdle but I use main studs and billet main caps. Mine has been together since 2011 and still running good and has pushed my 63 into the 10.70's. I run a solid flat tappet cam and use the Indy EZ heads and the Indy dual plane intake with a Holley 850 DP. Good luck with yours. Ron

 

[GITEX]

What intake is that your using for the trickflow 270s?

Trick flows intake, it bolts right up on a Low deck

 

[Don Chapel]

Trick flows intake, it bolts right up on a Low deck

I cant find a trickflow low deck intake.

 

[5.7 hemi]

Summit has them.
https://www.summitracing.com/search/make/dodge/engine-size/6-6l-400/engine-family/mopar-big-block-b

 

[68 HEMI GTS]

Trick flows intake, it bolts right up on a Low deck

I’ve been told the trickflow intake won’t go to MW size.?

 

[GITEX]

I’ve been told the trickflow intake won’t go to MW size.?

Mine bolts on and runs,I was told by tf they port matched it to the heads which I’m in the process of doing.
I’ll keep you informed with pictures of before and after.

 

[m79ded]

As said either will work in a street car. Many feel if you go over about 650 hp then you should go with the slightly stronger 400 or an aftermarket block. Myself I went with a 440 block when I built my 493 in my 63 Sport Fury. I knew it was going to be a street car I only race once or twice a year and I don't street race it so its not run real hard that much. And I knew my build was going to be about 600 hp at the flywheel. I also may go to a crossram intake one day which is another reason I went with the 440 block. I don't run a bottom end girdle but I use main studs and billet main caps. Mine has been together since 2011 and still running good and has pushed my 63 into the 10.70's. I run a solid flat tappet cam and use the Indy EZ heads and the Indy dual plane intake with a Holley 850 DP. Good luck with yours. Ron

View attachment 557178

Thank you that is very sound advise, I'm basically around the same as your usage. Street driven Track once or twice a month, car shows and cruising and I have a 4000lbs 79 Magnum to lug around.I don't have the girdle or billet caps on my block.

 

[Don Chapel]

Mine bolts on and runs,I was told by tf they port matched it to the heads which I’m in the process of doing.
I’ll keep you informed with pictures of before and after.

That would be cool if you sent the pics. Are the runners way smaller on the intake side? Enough meat to cut out? Thanks

 

[GITEX]

That would be cool if you sent the pics. Are the runners way smaller on the intake side? Enough meat to cut out? Thanks

Looks to be enough. Taking the manifold off this weekend, So measurements and pics then.

 

[68 HEMI GTS]

GITEX, if you get a chance you mind throwing up your combo in the 500ci thread I started. That’s another stout running Combo and I’m sure you’ll continue to get more out of it!

 

[Garys1969RR]

I have a 383 stroked to 496 (4.25" stroke) and it has been quite reliable, with many high 10 second passes down the 1/4 mile. This is a roller cammed engine, and regurlarly sees 7000 RPM. And the 383 has the smallest main journal supports of any of the big blocks. I would prefer a 400 block as a starting point, due to the thicker and stronger main bearing supports.