[AndersonRacing44]

well today i found out that both pontiac 455 blocks i have are no good...so my 455 build is ended because i dont want to pour more money into it.

now, the pontiac 350 thats in it, i have a pretty radical crower cam, a 4bbl intake with a Q-jet, and a set of heads with the same cc but a little bigger valves o and some headers.

should i even bother putting in the cam or will it run crappy since the compression is like 8.5.

thanks for replys im so frustrated haha

[techinspector1]

Originally Posted by AndersonRacing44

should i even bother putting in the cam or will it run crappy since the compression is like 8.5.

A stock cam would work best. The long cam probably won't make enough power to pull the hat off your head at R's under 3K.

[ericnova72]

Stock compression ratio on the mid-70's Pontiac 350 is 7.8-1, and if you put larger chamber 400 or 455 heads on it it will be even worse, you didn't actually say what heads you have on it. A big cam is a definate mistake, think 212° @ .050" as the max to use, something around 205° would be better if 350 is stock.

What is actually wrong with the 455 blocks??

[AndersonRacing44]

the first was .040 over and the TRW high compression pistons ive got are .030 and the second has a bunch of cracks.

[CustomChrome]

40 over? I've seen guys on the track at 120 over. It's not a Chevy. Pontiac has thicker cylinder walls.

[345 desoto]

Sleeve it...

[Hippie]

Originally Posted by AndersonRacing44

the first was .040 over and the TRW high compression pistons ive got are .030 and the second has a bunch of cracks.

A set of pistons is making you call it quits? If you REALLY want to build a 455 cough up for a set of 60 over's and put your 30's on ebay or back on the shelf for another day. Of course you could end up with a mini-warehouse of parts like me.

[PatM]

What Hippie said. I culdn't agree more. You can probably recover 75% of the piston cost on e-Bay. A 455 Tin Engine has gotta be better than whatever you'd with the 350.

[WDCreech]

Originally Posted by CustomChrome

40 over? I've seen guys on the track at 120 over. It's not a Chevy. Pontiac has thicker cylinder walls.

I don't know where you get your information, but I've been building Pontiacs for over forty-five years and I have yet to find a V-8 block that will safely take a .110" bore in all cylinders, and no 455 was even close. As a matter of fact, I had a '72 455 that had so much core shift that it would only go .030" without filling with Hardblock. Any time that I need to bore a block more than .030", I sonic check it.

[AndersonRacing44]

I know i could do all that sleeve it, buy bigger pistons etc, but thats like 500-800 in machine work 800 in new pistons thats atleast 1600$ i dont have =/ I got the pistons for 100$ and the blocks/ crank for 200$ so ill try and get my money back and just wait till i can find something worth my money.

i was just hoping to use what i have to beef up my 350 a little while i wait.....having a 4-speed car with 190 hp is not to much fun haha.

[345 desoto]

http://shop.ebay.com/i.html?_nkw=pon....c0.m270.l1313

[V8&4spd]

What were you going to put the engine in? It's not like a Chevy where you can buy a set of pistons for $60.

[WDCreech]

Originally Posted by AndersonRacing44

I know i could do all that sleeve it, buy bigger pistons etc, but thats like 500-800 in machine work 800 in new pistons thats atleast 1600$ i dont have =/ I got the pistons for 100$ and the blocks/ crank for 200$ so ill try and get my money back and just wait till i can find something worth my money.

i was just hoping to use what i have to beef up my 350 a little while i wait.....having a 4-speed car with 190 hp is not to much fun haha.

If you were to sleeve it, You could use the .030 pistons, but there are some fairly inexpensive stroker kits, out there, for the 350. If you're interested, I can post a link or two.

Bill

[AndersonRacing44]

id like that bill thanks!

[WDCreech]

Here you go: http://www.pacificperformanceracing.com/about-us.html - http://www.jbp-pontiac.com/ - http://www.angelfire.com/fl4/pontiac...chineshop.html - http://www.krepower.com/ - http://www.sdperformance.com/
That ought to do for a while. If you need more, let me know.