New Spark Setup! Any tips on Installation?

[TJ's GMC]

.060 on Champion plugs?

[GBCustoms]

Originally Posted by TJ's GMC

.060 on Champion plugs?

Yeah probably not the best idea but, hey it runs. I got the correct AC Plugs to replace them.

Another question, Different topic, Is full 3" exhaust too big? Using the stock manifolds and down pipes then 3" thru flowmaster 50s.

[bigblockv6]

What gear ratio are you running? If you're in the 3's 2 1/2 inch pipe diameter will be more than adequate. I you're at 4.56 then 3 inch will be fine.

[TJ's GMC]

Originally Posted by GBCustoms

Yeah probably not the best idea but, hey it runs. I got the correct AC Plugs to replace them.

Another question, Different topic, Is full 3" exhaust too big? Using the stock manifolds and down pipes then 3" thru flowmaster 50s.

3 inch is over kill. Mainly because the exhaust manifold outlets are 2.25 and the motor doesn't have the need for top end. 2.25 or 2.5 is plenty. Not going against what Pete said by any means though. lol 3 inch should roll the noise a little more.

[bigblockv6]

Originally Posted by TJ's GMC

.060 on Champion plugs?

That's why I didn't like the idea of stretching out the gaps on non HEI plugs because you don't really get a true gap at even .055 maxed out, so I did some research and found the correct plugs

[TJ's GMC]

Originally Posted by bigblockv6

That's why I didn't like the idea of stretching out the gaps on non HEI plugs because you don't really get a true gap at even .055 maxed out, so I did some research and found the correct plugs

I remember maxing out the NGK's on my 292. Made the idle bad...started popping and idling rougher. I still need to open the NGK's on mine from .035 to .045. lol Gonna try that and then get those AC's.

[GBCustoms]

Originally Posted by bigblockv6

That's why I didn't like the idea of stretching out the gaps on non HEI plugs because you don't really get a true gap at even .055 maxed out, so I did some research and found the correct plugs

which plugs are you using?

[bigblockv6]

I'm using R44XLS6 in my 478M which is one step hotter for 7500-8500 series trucks that came with this engine, though it's in my 68 3/4 ton 4wd pickup it should be fine, the heat range is just right for the 351E. I'm sure it could be cross linked to a step colder or hotter if need be. Funny thing is the plug is for a 90's 4 cylinder GM application and it has the correct 3/4 in reach for most GMC V6 application

[TJ's GMC]

Originally Posted by bigblockv6

I'm using R44XLS6 in my 478M which is one step hotter for 7500-8500 series trucks that came with this engine, though it's in my 68 3/4 ton 4wd pickup it should be fine, the heat range is just right for the 351E. I'm sure it could be cross linked to a step colder or hotter if need be. Funny thing is the plug is for a 90's 4 cylinder GM application and it has the correct 3/4 in reach for most GMC V6 application

You recommend colder or hotter for my 305?

[bigblockv6]

44 is actually the right heat range for a 64-65 305E, I think you'll be fine