PISTONS ?

 

Sounds decent, does seem like a lot of gear. What tires an tranny are you thinking about? What compression? You should not come up short with the heads specs you mentioned. Thats alot of flow.

 

454 build

sorry forgot to mention pistons.. dont know a whole lot.. dome pistons and 9.5 to 1 cp... im running a th350 built up and right now just radials about 10" wide but i plan to get some street slicks..

 

Staying with the stock bore? Looks like a 15cc dome will yield abut 9.5, with zero deck. Is that the piston you're looking at?

 

454 build

ya stock bore.. i bought the block new with the pistons in it but i would say thats probably about right.. i havent had time yet to really look at it..
thanks for you time anything helps

 

that cam will work best with 4.11's and 28 inch tall tires, 10:1 cr and a single plane intake (victor jr.)

how heavy is the truck?

 

454 build

ya i want to change my gears from 456 to 411 but cant afford it right now with the build... the truck weighs apprx 3900lbs

 

how tall are the tires?

 

their 29" tall so they help out.. what do you think my HP will be approx..

 

maybe like this.

http://www.chevyhiperformance.com/techarticles/0802ch_454_big_block_engine/index.html

 

Truck weighs 3900lbs ? You sure.

Other than $2-3k , 4 pad scale systems, how do you weigh your car acturately. Answer , take it to the yard waste landfill. they have a full size scale you pull the vehicle onto takes weight . Then compares it to the empty vehicle weight and charges for the trash dump.

Good comments.

 

okay i just got that motor torn down.. like i said bought it from a guy who said it was just rebuild and everything was new... well he was telling the truth i you can tell its all brand new.. but i looked up the pistons they are actually 20 over speed pro pistons flat tops with 2 valve reliefs. part # h661cp... are these pistons any good??? i really cant afford to change the pistons along with the aluminum heads and solid roller swap... let me know what you guys think
thanks

 

hard to build compression with those pistons.

low 8's with your current setup.

942cc for the cylinder
115cc for the head
9cc for the head gasket
4cc for the deck (assuming 0.020" below deck)
3cc for the piston reliefs

(942 + 115 + 9 + 4 + 3)/ (115 + 9 + 4 + 3)= (942 + 131)/ 131= 8.19:1 cr

you need 10:1 for that cam.

change pistons or add boost.

 

ok thanks man... what would be a good piston to go with thats not gonna cost a fortune! i appreciate ur help..

 

H661CP is a cast piston. If it had been a forged piston, it would have been an ideal candidate for a blower. :thumbup:

I have posted a link, several times, to an article involving an under-driven 8-71 which would give you all the HP/TQ that a 62 Chevy 1/2 ton could ever handle.

I've got a 66 GMC (surprised?) that I've been working on for several years ... and is still at the engine-on-frame stage. It hasn't turned a wheel under it's own power yet ... but it sounds good.

 

-22cc dome, +0.020", $45/each, will make about 9.9:1 cr with your current setup

http://www.summitracing.com/parts/SLP-H693CP20/





-30cc dome, +0.020", $43/each, will make about 10.6:1 cr with you current setup

http://www.summitracing.com/parts/SLP-H581CP20/

 

Sweet thanks 454c10 you have been lots of help i appreciate it! One more question can you run 10.5 to 1 in a 454 and still run 91 octane??? i can tear um apart put it back together and mostly all the basics but im still a young guy and this will be the first motor i build my self. in the past i normaly have just bought motors that were already done and i just had to do minor stuff .. pushrods intakes ect ect.. but anyway thanks man

 

That is good info, and not looking for trouble. My interjection has to do with vehicle wieght. Acceleration is power vs weight.

How did you come upon 3900 for the truck ? Any Full size truck owners who weighed there vehicles, please chime in.

 

my 70 c10 LWB weighed 3900lbs with a 350cid, th350, ac, power steering, and power brakes.

Then climbed to 4300 lbs with the 454, th400, bigger tires, bigger exhaust, and about 40 pounds of of sound proofing.

 

Sweet thanks 454c10 you have been lots of help i appreciate it! One more question can you run 10.5 to 1 in a 454 and still run 91 octane??? i can tear um apart put it back together and mostly all the basics but im still a young guy and this will be the first motor i build my self. in the past i normaly have just bought motors that were already done and i just had to do minor stuff .. pushrods intakes ect ect.. but anyway thanks man

I would use the lower compression (9.9:1 cr) for 91 octane. The aluminum heads will help and may work. But BBC's do not tolerate compression ratio as well as most engines. The power gain going from 9.9 to 10.6 is not worth it. Maybe a 1% increase in power.

 

This web site listed below matches fairly well with what I measured on my truck when it had a 350 in it. But I added ps, pb, ac, duals, more gas (maybe). Old 1/2 ton trucks are light.




1970 Chevrolet Model CE10934

The CE10934 is, as you will see from the photos, a Fleetside longbed model with a 127-inch wheelbase and V-8 engine. My truck's dimensions are 207 3/4 inches long by 79 inches wide by 70 inches tall. Unloaded curb weight is 3,737 pounds. These were available in many colors, and mine is medium gold and white.





Got the weight from this web page about 3/4’s of the way down.

http://www.wkinsler.com/truck/index.htm

 

to spinn and 454c10

okay spinn thats not a exact weight i just guessed.. but i would imagine its really close to that those old 60's models are heavy but i could be wrong...

454c10... okay so if i go with the 9.9 to 1 piston.. whaT did you mean when you said the alum heads will help and may work??

 

While ago the village public works landfill scale was free way to weigh your hotrod. My 305 c10 SB was around 5000. A Honda Accord was about 3800.

 

wow, a 3800 pound honda. The car world has changed a lot since 1975!

the gross weight listed on the door of my truck is 5000 lbs. Minus 1000 lbs pounds (1/2 ton) gets it to around 4000 lbs. Check your door and see what the gross weight is.

Aluminum heads can handle more compression ratio than a similar iron head due to more heat conduction out of the combustion chamber. The rule is 0.5 to 1:1 more compression ratio can be used when using aluminum heads.

I would use 10:1 cr with that cam and a 454 with iron heads but that is with 93 octane. Since you are using aluminum heads, you could run 10.5 to 11:1 with that cam. But the 91 octane could be a problem, so to be safe, I would use the -22cc pistons. Plus I don't know what the deck height is which could easily raise up the compression another 0.25:1 (over the 9.9)

and you could use a thinner head gasket with the -22c pistons and get another 0.25:1.

The -22cc are the safer bet with 91 octane even through the -30cc's may work but would be on the edge of detonation and not worth the extra 1% more power (imo).

 

okay cool.. well thanks for all your help! you have been a huge factor in helping me with this build.. Im ready to buy all the parts here in a day or so.. i will keep you updated with everything..
thanks again