Boss 302 with 1/2" heads bolts. My heads got 7/16

so im going to buy the new boss 302 block and boost the shit out of it. i have a set of performer rpms that are heavily ported but have 7/16 head stud holes, should i have them drilled out to 1/2"? and will this sacrifice n e strength, i dont think that it will but im not a pro on these things. just a kid with some money, a dream, and a mustang.

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

break out the drill and take it slow. I have done it like that several times

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

Yup, you'll need to drill out the bolt holes.

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

it wont cost alot to have a machine shop do it either, just might be a better idea so you dont F it up, im not sure about the edlebrock heads but the trickflows are 1/2 inch most of the way with a just a little bit of the top being 7/16, if yours are like that then you probably could drill them yourself

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

To do it right with a hand drill, go pick up a 7/16" to 1/2" step drill. You don't want the drill to wander in any way.

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

I THOUGHT all edelbrock heads have 1/2 holes

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

not all of them

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

The only way to get a hand drill to do it straight.

A machine shop might have one or be able to put them in a Bridgeport or a seat/guide machine and get the holes perfect. Check with a local machine shop on their price vs the step drill bit. The bits could be a tad pricey and not worth buying to do it once compared to the shop price.

Just my oppinion. Hope this helps.

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

thx,im gonna go with the machine shop since the block is gonna be there n e ways and the heads are gettin ported. also i sometimes have a "touch of downs sindrome" sometimes which causes me to screw up expensive parts.

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

I've see them done with a hand drill,would not recomend !!! With head studs it was a pain in the @ss to get the heads on and off. I did a set on the drill press,made sure the table was square to the drill bit and it worked fine.

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

ARP makes some bolts and/or studs that are 1/2" on one end, and 7/16" on the other.


Bolts, not sure about studs like that:

http://www.arp-bolts.com/Catalog/Catalog.JPG/ARPCatalog_0042.jpg

 

Re: Boss 302 with 1/2" heads bolts. My heads got 7/16

well, thanks for all the info guys, umm the whole trying to do this build cheap went out the window 6 months ago.. lol. i will be putting the build up in a couple weeks, so now its got t-6 75mm 1.1AR, glenns performance fuel kit, fuel cell, victor jr heads 64 cc heavily ported, super victor intake, narrowed built 9 inch, willwoods in the back, cobra twins up front, matte black paint, matte black wheels, and holes in the bumper to snatch up any random unsecured babies.