scooter123

Hey guys my engine 455 is still at the machine shop it getting bored .030 decked, and 10:1 pistons!!
I have a comp cam purchased thinking I could use my stock pistons, but they were no good
So the part number of my cam is EX262h will this be ok I will be running with the bump in compression using stock G Heads, performer intake

http://www.compperformancegroupstore...DSCAMHydFlatXE

cutlassefi

What are your goals? What piston are you using?
If it's really 10.0:1 then that cam is a bit small.

Why did you pick a Comp? Because they advertise the most?

scooter123

Well Like I said I was banking on using my stock pistons......I did a lot of online research and also spoke with 2 of comps techs and that what they recomended at the time!!!

Now that the pistons have changed and decking the block and heads it will bump up the compression a little more than 10;1......at least thats what the engine shop told me!!

So will the car run ok with cam or will it cause me problems??.....Im keeping my stock heads and valve setup

cutlassefi

I'll ask again, what piston are you using? I hate to say it but too many shops don't know how to compute compression ratio.

Thanks.

scooter123

I think its a speed pro....... Thanks for taking the time and any info you have to help me out!!

cutlassefi

If you have the Speed Pros then the only way you'll have even just 10.0:1 is if it's 0 decked, the heads are milled to 78cc and you use a 9cc head gasket. Otherwise you have 9.5-9.75:1. That piston is shorter than most of the other aftermarket 455 pistons. That means your shop will need to take approx .030 off the deck of the block to bring it to 0. Did they do that? Probably not huh. Or you'll need to use a shim head gasket. With that compression your current cam choice wll probably be ok but it won't make a lot of power.

Like I said too many shops don't have a clue how to figure a true compression ratio. Seems your guys may not know how to either.

scooter123

Thanks for the info.....I will check with the guy doing the work....I hate to second guess the guys work....Im pretty new when it comes to this stuff, so I dont want to **** the guy off!!

I wont be racing the car...just want a fun street car....I hope this upgrade will be better than stock!!

Thanks

cutlassefi

It's your money. You should be able to ask any question you want. If that bothers them then you need to go elsewhere.

Should make 325-350 and be a fun ride with your current setup.

scooter123

Ya I hear ya!!