[pontibeast]

I am going from 350 to my new 455. It will be replaced with a bigger stroke and bore during the next rebuild. It's a virgin bore 455 so there is room for an overbore and 4.5 stroke later on.

[gtofreek]

Originally Posted by Tom Vaught

455 WITH E-HEADS CURRENTLY AND BG HOLLEY 6-PACK

Tom V.

So what, you running Mopars now? LOL!

[1968GTO421]

When I was a teen, I loved to watch the big 421 Cat's do in the 406/427 Fords and 409 Chev's. I always wanted a 421.
Call it a 428, to me it's my 421 with an over bore!

[carbking]

I got totally ticked off at the magazine writers in 1974 for killing the GTO for not having a 7456 displacement engine. So I set out to see what a Pontiac 350 could do. And will confess to probably having more HP than I really need.........but ain't it fun

Jon

[gtofreek]

Originally Posted by carbking

I got totally ticked off at the magazine writers in 1974 for killing the GTO for not having a 7456 displacement engine. So I set out to see what a Pontiac 350 could do. And will confess to probably having more HP than I really need.........but ain't it fun

Jon

Maybe it's just me, but ??????

[b-man]

Originally Posted by gtofreek

Maybe it's just me, but ??????

7456ccs = 455 cubes.

Kind of disappointing that the '73 -'74 455 SD didn't make it into GTOs.

[gtofreek]

OK, that makes sense. I wasn't thinking metric here!

[carbking]

Originally Posted by gtofreek

OK, that makes sense. I wasn't thinking metric here!

Sorry - just having a little fun.

Jon.

[carbking]

Originally Posted by b-man

7456ccs = 455 cubes.

Kind of disappointing that the '73 -'74 455 SD didn't make it into GTOs.

If it did, how would we have kept rear tires on the car without tubbing the body?

Jon.

[Johnny406]

301 & 400 in the street cars
350 & 455 in the race cars/projects

[Firebob]

.030 455(463). Kinda like running with scissors, it's all fun till somebody gets hurt.

[rexs73gto]

The 455 with a .30 over bore is 462 not 463. But my fav is the 469 I'm building right now for next season. It is a 455 with a .60 over bore, it has Ross light weight forged pistons, Eagle H-beam rods Alum. E-heads 87cc round ports. It will have a Crane Blue print RA IV cam which I used & have used in several engines over the years & I love the way that cam works. I've used it in 400's 455's & even now the 413 which is a 400 with a .60 over bore. That cam make the car jump when i hit the gas but still I love the brute force of the 455's.

[ta man]

Currently a 462/455...but may be going larger this winter..

[PDC]

400 with Stroker crank in Greenie
455 in Big Red

The Green car has more cam and ported e-heads and the Red car as a little less cam and box stock e-heads, and Red just has more of that light-switch kick-in-the-pants feel when you drive it. Green definitely pull harder between 3k-6k.

[AdamIsAdam]

Originally Posted by craigs69

469 cubes here.

455 block, 4.19 bore x 4.25 stroke

Exactly my recipe too. 469cid baby!

[Firebob]

30 over 455 is slightly over 462. I guess some of us just like to round up eh?

[surfsama]

I preferred a leaner fighting machine: 433cu (428 +.030 x 4.00)

[gtofreek]

Originally Posted by Firebob

30 over 455 is slightly over 462. I guess some of us just like to round up eh?

Or they could have gone 4.185" bore for a better selection of rings, and just calling it .030" over instead of .035" over. What's the real difference anyway, 1 cubic inch? Yeah, I guess that's worth arguing over.

[74Grandville]

The results are interesting, just goes to show how many big cars have undergone engine rapes! lol

yes, I am guilty as well.

[b-man]

Originally Posted by 74Grandville

The results are interesting, just goes to show how many big cars have undergone engine rapes! lol

yes, I am guilty as well.

What I find interesting is how 'real' 455 builds outnumber stroked 400 blocks for roughly the same cubes by a ratio of about 2 to 1.

I guess the 455 blocks with their slightly thinner main bearing support structure as compared to the 400 blocks (3.25" mains vs 3.00" mains) are fine for most builders who want a big-cube engine.

A 'real' 455 is still the least expensive route to big cubes for the street. Good factory 455 2-bolt main blocks and cranks can usually be found together for somewhere around $500 these days, a very economical basis for big street power.

Also a bit surprised that there aren't more aftermarket blocks being used for the street, where cubes are king.