HELP,HELP pontiac gurus

Rich Biebel · 10-30-2017, 08:10 AM

"will my junk live to 7500 rpm"

NO !

ss3011 · 10-30-2017, 12:08 PM

Heavy pistons , need a better connecting rod . You must have pretty decent heads if you are winging that engine to 7500 . Its possible !

1legjerry · 10-30-2017, 04:18 PM

Yes, you can build a Pontiac 400 that will do 7500. But the parts you listed will likely not get you there.

I'm thinking a lighter piston, Lighter 326 or 350 crank, Way better intake. A Professional port and valve job. and a roller cam would be nice.

Spinning 7500 and making power at 7500 are 2 different things.

Dave Noll · 10-30-2017, 07:11 PM

What I remember of Pontiac's from when I had one was CAST connecting rods, not Forged. But the SD rods, I don't know. Looks like Scat and Eagle make forged rods for it.

ss3011 · 10-30-2017, 09:06 PM

Quote:

Originally Posted by Dave Noll

What I remember of Pontiac's from when I had one was CAST connecting rods, not Forged. But the SD rods, I don't know. Looks like Scat and Eagle make forged rods for it.

The SD rods are forged , but the early ones still had 3/8" bolts , the 73/74 SD rods had 7/16" bolts , most of the aftermarket rods have 7/16" cap screws .

Bruce Fulper · 10-30-2017, 11:12 PM

What are you guys doing in my garage. :-)

Do NOT even attempt this. It's taken me a long time to find out what works, what lives, and how high of rpm I can go SAFELY.

You tell me the car, the race weight and the ET you'd like. Get that 7500 rpm stuff outa your head. That's not a smart way to approach a project.

And spend $300 bucks on some chinese rods which are way stronger than any factory rod made. I hate it too. (Off shore stuff) But 98% of my customers act like they're dead axx broke, but want the double throw down massive hp. So they get the rod that's very good, and cheap.

craiger · 10-31-2017, 05:58 AM

UGGGH!!! ok so I can not wring this motor where I want to. Bought a set of Molnar rods so maybe it will live @6200-6400 rpm. It is a street car with a pro-shift nash 5 speed but I like shifting at 7000+ rpm ,looks like I will have to learn to shift at 6200. non-tubbed car will be fun trying to hook up this
torque monster using 1972 technology. Extended lakewood slappers and a decent adj. shock, 9 or 10 inch tires. Doing a street-strip car like we had in 1972. Frame connectors but no cage.

10-30-2017, 08:10 AM	#1
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	Re: HELP,HELP pontiac gurus "will my junk live to 7500 rpm" NO ! __________________ Rich Biebel S/C 1479 Stock 147R

10-30-2017, 12:08 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: HELP,HELP pontiac gurus Heavy pistons , need a better connecting rod . You must have pretty decent heads if you are winging that engine to 7500 . Its possible !

10-30-2017, 04:18 PM	#3
1legjerry Junior Member Join Date: Jul 2011 Posts: 85 Likes: 4 Liked 72 Times in 15 Posts	Re: HELP,HELP pontiac gurus Yes, you can build a Pontiac 400 that will do 7500. But the parts you listed will likely not get you there. I'm thinking a lighter piston, Lighter 326 or 350 crank, Way better intake. A Professional port and valve job. and a roller cam would be nice. Spinning 7500 and making power at 7500 are 2 different things.

10-30-2017, 07:11 PM	#4
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 710 Likes: 2,671 Liked 240 Times in 112 Posts	Re: HELP,HELP pontiac gurus What I remember of Pontiac's from when I had one was CAST connecting rods, not Forged. But the SD rods, I don't know. Looks like Scat and Eagle make forged rods for it. __________________ Dave Noll, EF/S ,?/SA 6526

10-30-2017, 11:12 PM	#6
Bruce Fulper Senior Member Join Date: Aug 2004 Location: So. Cal. Posts: 651 Likes: 4 Liked 54 Times in 33 Posts	Re: HELP,HELP pontiac gurus What are you guys doing in my garage. :-) Do NOT even attempt this. It's taken me a long time to find out what works, what lives, and how high of rpm I can go SAFELY. You tell me the car, the race weight and the ET you'd like. Get that 7500 rpm stuff outa your head. That's not a smart way to approach a project. And spend $300 bucks on some chinese rods which are way stronger than any factory rod made. I hate it too. (Off shore stuff) But 98% of my customers act like they're dead axx broke, but want the double throw down massive hp. So they get the rod that's very good, and cheap.

10-31-2017, 05:58 AM	#7
craiger Junior Member Join Date: Jan 2016 Posts: 28 Likes: 0 Liked 0 Times in 0 Posts	Re: HELP,HELP pontiac gurus UGGGH!!! ok so I can not wring this motor where I want to. Bought a set of Molnar rods so maybe it will live @6200-6400 rpm. It is a street car with a pro-shift nash 5 speed but I like shifting at 7000+ rpm ,looks like I will have to learn to shift at 6200. non-tubbed car will be fun trying to hook up this torque monster using 1972 technology. Extended lakewood slappers and a decent adj. shock, 9 or 10 inch tires. Doing a street-strip car like we had in 1972. Frame connectors but no cage.

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