J's_Cobra

I am building a 312 roller motor and was wondering if there are any little tricks when putting it together to gain HP? Also if i am going the right way with the motor to build high horsepower? The motor is a mid 80's 302 taken out to a 312. i have a stock crank and stock rods with ARP everything. It has hypertectic pistons. I got a set of 3 line GT-40 heads that have the valves bored out to 1.94 and 1.600. I have a set of roller rockers on them. The cam is from lunati and its has a lift of 5.65/5.65. and i also got a fadenza Aluminum flywheel. if you could give me tech tips it would be greatly appreciated.

AdderMk2

mind explaining how you got 312???

J's_Cobra

The motor was found by my dad and it already had work done to it. the machinest told me it was bored to around a 312. i know a lot about parts but not much about machine work so i just took his word for it.

AdderMk2

if that block is bored out to have 312 cubes... you got a junk block

max bore on a stock block is about .060. anything more than that and the cylinder walls get too thin.

have fun when that piece of crap breaks on you

J's_Cobra

its .60 over it has a 31/2 in stroke with a 4 inch piston. I guess the number might not be right. what would that make the motor then?

AdderMk2

3.5" stroke makes it a 351w.... not a 302

J's_Cobra

im so F***ing confused now. Thanks for the advise. anything you know that i can do to get easy horsepower?

AdderMk2

nitrous is easy HP
blowers are easy HP

anyway.
a 302 has a 4" diameter piston, and a 3" stroke
a 351w has a 4" diameter piston, and a 3.5" stroke. Its also a bigger block (not big block)

312CID is formed with a 302, with a .070 overbore
if your engine is a 302, and is .060, its a 310. and I still wouldnt ever put it in my car.

mjr46

you have a hybrid 302...lol

J's_Cobra

I had a 150 shot on the old motor and was thinking about putting it on the new one. dont know how well the car will hold.