Spark Plug for '79 ... Std. AC or Rapidfire?

Reply Subscribe

Thread Tools

Search this Thread

May 20, 2005 | 03:47 PM

Tom T

Thread Starter

Burning Brakes

Joined: Nov 1999

Posts: 790

Likes: 0

From: Flanders NJ

Spark Plug for '79 ... Std. AC or Rapidfire?

currently have Rapidfire.. is it worth the extra $ or just go w/the Std. AC Plug? I have a stock L48 '79

thanks... TGIF

May 20, 2005 | 04:00 PM

marshrat99

Melting Slicks

Joined: Aug 2003

Posts: 2,135

Likes: 2

From: Dayton Oh

IMO the standard plugs are all that you'll need under most circumstances. I'm sure you could use the $ you'll save elsewhere.

May 21, 2005 | 09:38 AM

bigvette1

Drifting

Joined: Jan 2002

Posts: 1,645

Likes: 11

From: Schaumburg IL

Plugs

I used the rapid fire for a BBC and did not find any real gain in performance. I did think the idle was a bit smoother with the rapid fires. Are they worth the extra $$'s - that is a decision on how often you change plugs.

May 21, 2005 | 09:43 AM

73conv

Intermediate

Joined: Apr 2005

Posts: 34

Likes: 0

I have used the expensive plugs, but went back to AC and didn't notice a difference.

May 21, 2005 | 10:04 AM

gkull

Team Owner

Joined: Apr 1999

Posts: 21,953

Likes: 1,445

From: Reno Nevada

2024 C3 of the Year Finalist- Modified

If your heads are the short reach tappered plug. Get Bosch Platinum +4 They really worked for me.

Oh the part number is 4449 it's the four tip

May 21, 2005 | 11:39 AM

78pacer

Drifting

Joined: Aug 2004

Posts: 1,327

Likes: 5

From: 2010 C6 Grand Sport Convertible

Quote:

Originally Posted by gkull

If your heads are the short reach tappered plug. Get Bosch Platinum +4 They really worked for me.

Oh the part number is 4449 it's the four tip

Bosch are excellent plugs. They have a very true heat range. I run either Bosch or A.C. and have had good luck. Bag Champions, the plugs have a very inconcistant heat range.
Mike

May 22, 2005 | 10:04 AM

71redskin

Burning Brakes

Joined: Feb 2005

Posts: 977

Likes: 1

From: wash. dc

plugs on '79

i was just with the master and recall hearing him say that he went somewhere that had a way to test spark plugs by checking them under variuos compressions to see which ones lost their spark the quickest...his observations were that the new platinum tipped plugs lost their spark consistently at lower pressures than the old tried and true champions an ac delco's...