470 short blocks

On a ungirdled block, any advantage of using main studs over bolts?

Any downside on internal balancing to external other than $$$$$?

Do you have core block and cranks in stock? (wondering about exchanging cores at pickup?)

Allen

 

Hmmm, Jim's web site is down.

 

Site is back up, we changed back to my original domain name..

www.trishieldperformance.com

I don't like main studs in a 455.. We used to use them alot, but always noticed that the main housing would not repeat.. Meaning.. when you torque it up, and then measure the hole, and then break it apart and re-set it up, and re-torque and measure, the holes often don't come back to the same size.

The main housings have to repeat, to accurately set the main bearing clearances.

This can vary from block to block, and is applicable to an unfilled block. Once you fill them, they become fairly stable.

I have a number of 580-600 HP motors out there, with the factory main bolts. They do just fine, and the factory used very good bolts.

I only use studs in a short fill block, with a girdle.

No downsides to internal balancing, just the cost..

Yes, plenty of cores in stock.

JW

 

It's good to see the site back up, Jim.

Hey, love the new avatar photo too. More info on that motor please! :beers2:

 

There will be a whole write up coming.. have the last dyno session on it coming up tomorrow.

We will spend 12 hours on the dyno with this one, after tommorrow.

Ran 2 different cams, and 2 different intakes, fuel pump testing, carb swaps, changed cam timing ect.. and mulitple combinations of the above.

It's an NOS 455 block, STG 2 pistons, rods, crank, timing cover, balancer and an orginal STG 2 cam is one of the ones tested. Iron STG 2 heads (full port on the intake, untouched exhausts), correct 850 Holley, correct B4B.. it's built to be a "period piece" representative of what a hot street/strip 455 would have been in the early 70's.

Lots of head flow and dyno sheets.. Heads have the best .500" valve opening intake ports I have ever tested in and Iron head, but they are big, low numbers suffer a bit, and show interesting results on the torque down low.. but they do make the HP..

Over 500 Hp, with the factory cam.. as you see it sitting in the picture..

I also built this motor with "old school" clearnances, right out of Buick's HD spec sheet..

Results are interesting so far..

 

Sounds like a nice motor. I love the nastalgic approach, something I've been considering as I plan for a 455 (though no actual Stage 2 parts in my budget).

Looking forward to the full write up (with pics, right?!) :TU:

 

The second i saw your avator I knew exactly what it was:TU:
be interesting to hear what the figures are with that stock stg2 cam.
I'm guessing there will be a huge difference between that and a cam better suited to the percent of the int/exh flow....but now you throw in the fact that the intake is portedo No:

Cool!!

 

Ya, intake side of the heads are ported, intake manifold is untouched.. just the parts we had to work with.

That 226@.050 cam (STG 2) surprised us at the HP it made.

JW

 

Can't wait to see the write-up on this one!
Jim, You are more than welcome to run that Dual-Quad manifold on that beast if you are so inclined-and feeling ambitious!:grin:
Thanks for the knowledge to be gained with the results-
Jerry

 

stock deck height on a 455 is 10.50 or 10.57 is it true 0.020 taken off can square up a block?

I had my block and heads at a shop and he was preparing to build a short block, the shop closed he gave me my parts back and with the parts were the rods he ordered but they are 7.25 in BBC billet aluminum rods but never purchased pistons, the crank is offset and widened for the rods, I need to figure out the piston CD so i can get pistons.
so is it 10.57 or 10.50 minus the 0.020 to square up the deck.

I could really use some help.

Dave Dicicco

 

stock deck height on a 455 is 10.50 or 10.57 is it true 0.020 taken off can square up a block?

I had my block and heads at a shop and he was preparing to build a short block, the shop closed he gave me my parts back and with the parts were the rods he ordered but they are 7.25 in BBC billet aluminum rods but never purchased pistons, the crank is offset and widened for the rods, I need to figure out the piston CD so i can get pistons.
so is it 10.57 or 10.50 minus the 0.020 to square up the deck.

I could really use some help.

Dave Dicicco

 

Dave,
The blocks are usually taller than 10.570, but that is the spec.. We cut to 10.550 for all the stroker combos..

But I use a 6.800 Rod.. with that long rod, your going to want to keep as much deck as you can on the block, because the piston is going to be really short.

I like a little more skirt on that piston for a street motor, to keep the piston stable under all conditions.

Get your block out to a new machine shop, and have them square it as tall as possible, and go from there.



JW

 

Jim as usual thank you very much for responding both here and a few times I called as well, might scrap the rods and figure out a new plan.

 

No problem.. If you do, we can help you with a 470 or 482, building them every day..

JW

 

I measured mine at 10.575"

 

Jim I have a buddy at work who had a short block built by you over 10 plus years ago his father had one built by PAE possibly even longer they are from Delaware both identical almost using stock rods with work, stock crank, oiling mods one with edelbrock heads he installed the other Stg 1 ported, they both are well over 500hp, the edelbrock head engine gets a 100shot of nitrous, and they have been beating on them for years, and stayed together fine and at 5 years they took them out I believe he said and checked everything still looked great.

I have a set of new wiseco pistons forged .40 I should move on from the added expense and use what I have the saved money I could use to ship the parts to you, I have three sets of rods and cranks we could use and be done with it...I get this stuff in my head to get them rods to work will cost so much money, we could still make good power without them

Dave