• 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Lead additive or octane boost?
#1
runninpony 
Just got the 302 engine up and running. It has a hotter cam, higher rise intake, 4 barrel Edelbrock, heavier duty oil pump and water pump, roller gear and timing chain. Rest of the engine is stock. Do I need to add octane boost or lead additive with every tank??? Should I run non ethanol gas?

Brian Kulis
  Reply
#2
blkulis;171870 Wrote:Just got the 302 engine up and running. It has a hotter cam, higher rise intake, 4 barrel Edelbrock, heavier duty oil pump and water pump, roller gear and timing chain. Rest of the engine is stock. Do I need to add octane boost or lead additive with every tank??? Should I run non ethanol gas?

If it is a recent rebuild, the cylinder heads should have had hardened valve seats installed if they were not already there and in good condition. For that reason, lead additive should not be needed with a modern engine or a recent rebuild. As far as octane boost, I would check with the engine builder and see what they recommend. The compression ration, cam, and head combo will determine if higher octane fuel is needed.

Non-Ethanol gas, if you can find it, would be my preference, although the Edelbrock carb probably has ethanol resistant gaskets and seals. You can check the manufacture date on the base to see how old it is. If it has been rebuilt, it probably has ethanol tolerant gaskets and seals, but you should double check to be sure.

Good luck. I hope that helps.

Ron
Rusty, a 1973 Mach 1, needs a lot of work.
Billy, a 1976 Ford Bronco, also needs a lot of work.
El Guapo, a 1986 F150, frame-off Resto-Mod.
Bubba, my 1994 F150, daily driver
Formerly, a 1973 Ford Mustang Coupe - a work in progress, then a car-b-qued banana.
  Reply
#3
Lots of heads are rebuilt without hardened seats. There are those among us (myself included) that think a pressed in seats-how matter how well installed, are potential failure points being added to the heads.

Often hardened seats from the factory were done by induction hardening. A coil was inserted and hit with voltage to bring the seat area up to a high enough temperature to harden it.

Lead substitutes won't hurt anything, but they are inconvenient and expensive. Your 302 should be fine if your tune is correct if you just run good gas.

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
  Reply
#4
If you didn't up the compression ratio you should be fine with pump gas. Octane boost is expensive and misleading. One of the best I found 'super 104' only added a point or two to the octane. So figure 91 went to 91.2 or so. Run it and tune it. If you find it is pinging on you then you might consider some type of enhansement. What's the highest octane you can get from the pump?

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
  Reply
#5
When I got my 302 rebuilt, I had it done with slightly higher compression, and the engine builder told me that it was going to be highest grade gas from here on out. You should be good with the premium stuff.
  Reply
Share Thread:  


Possibly Related Threads...
Thread Author Replies Views Last Post
  Transmission additive digithead 5 234 07-08-2018, 01:25 PM
Last Post: digithead
  engine break-in on 93 octane or race fuel? Rumbloki 5 706 07-23-2016, 09:58 AM
Last Post: Colga2012
  100 Octane goodnigh 8 1,407 07-26-2015, 06:27 PM
Last Post: rocket366
  Additive in unleaded Manu Mach1 3 718 04-14-2013, 05:25 PM
Last Post: marks73
  Race Fuel or other High Octane Fuel mweeps 10 1,351 12-04-2012, 11:33 AM
Last Post: 1971mach1
  what octane for 73 351 cj?? white73stang 26 2,301 10-03-2012, 09:20 PM
Last Post: auron73mach1
  5.0 and Boost Tnfastbk 29 3,351 04-08-2012, 09:44 PM
Last Post: Mesozoic
  to lead or not to lead..... 71MACH-1 42 4,311 03-28-2012, 08:40 PM
Last Post: Tnfastbk



Users browsing this thread: 1 Guest(s)