[Dusk_Blue_Z]

I've got a zero-decked, 12.5cc domed piston short block. On top are 492 heads. I bought a set of Accel 437s plugs (with the same reach as the stock plugs, 0.375). Unfortunately, they didn't fit on the heads I've got.

I picked up a set of Accel 8199. They have a reach of 0.46. Do you think that these plugs reach too far and I'll have clearance issues?

Thanks, Nick

[97Z4C]

that is alot of compression with 492 heads--definitly would be looking at a autolite plug not accel--i am not certain and i hope john or someone else chimes in-i think the r45ts in ac works on that head and would cross it over to autolite -definitly index your plugs with ground strap to top or gap slightly facing exhaust valve

[97Z4C]

also with that compression go alittle cooler like r42

[Dusk_Blue_Z]

Yes, if there's a better solution, by all means suggest it. For one reason or another, I read a lot of posts where the Accel shorty plugs were highly suggested.

[Dusk_Blue_Z]

While we're at it, can someone suggest a set of plug wires? Thanks.

[DOUG G]

http://www.autolitesparkplugs.com/se...nufacturerID=5

See if that helps you with the reach and cross overs.

Did you check the reach with the heads off to see where they set depth wise ?
With a dome and too much reach....you could have issues

[Dusk_Blue_Z]

Is there a general rule of thumb or equation for reach? This is something I probably shouldn't be guessing at.

[97Z4C]

well--you want the threads to end up at the end of head and not entrude into cylinder and you dont want extended reach plug-let me chek, i might have one of these heads laying around--accel is not the plug for high compression in my opinion unless you have to because of header issues (plug too close to header)--msd is the only wires --as many on here will tell u- taylor is no good

[97Z4C]

autolite 25 will work-do you have the angle plug 492s -is this why you want a shorty plug--the angle or straight plug 492 heads only flow 161cc intake stock--just saying with this amount of compression

[Dusk_Blue_Z]

Yes, I have the angled 492 heads. They've had some work done to them. Found out that my 186 heads were junk, so got the 492's in a pinch (trying to get the engine fired this Sunday).

I bought a set of the AC R42TS, but they aren't short enough. The Accel 8199's fit pretty well (in terms of clearing the headers). I have them gapped at .035, is that ok for the cam break in period?

I'll look up what MSD makes in a black wire that fits over the valve caps. Thanks for your help Darrell.

[Dusk_Blue_Z]

It doesn't look like MSD makes a custom fit product for my car. Are univeral wire kits the best alternative?

[97Z4C]

the universal wires will work--if you get the ones where you have to cut the wires yourself, take the time and crimp the ends correctly--the shorty plugs will work for now-but i really dont like them for racing--.045 gap if you have electonic ignition--(hei,msd,unilite ect.)--.035 gap is for points stile dist

[Dusk_Blue_Z]

I ended up getting a set of Prestolite wires. My only concern is two boots are nearly touching the headers. Do you know if those fabric-type bootguards would prevent the boots from melting?

I guess I'll find out how everything is going to dance together soon enough. Thanks for your help Darrell.

[97Z4C]

i have doon the same set up-alota work but dented the header a bit to clear with the backside of a ball pen hammer-well it worked- let us know how it sounds