HELP,HELP pontiac gurus

craiger · 10-30-2017, 02:25 AM

Want to run a .040 over 400 pontiac72-7500 rpm.

stock 68 400 crank, 63 421 sd reconditioned rods, .040 10:5 trw pistons 68 pontiac 400 heads comp. valve job with 1.65 harlan sharp rockers offenhauser low rise 2 4 bbl. manifold with 2 625 afbs, .600 lift 270 duration flat tappet cam, jackson gear drive, ati balancer, freshened mallory super mag circa 1970, butler valley support. 93 octane pump gas???

will my junk live to 7500 rpm,, have had bbcs,sbcs, 426 hemis, but never a poncho and have not a clue

craig esposito
sagarth.espo@gmail.com

Mike Jones · 10-30-2017, 07:32 AM

Quote:

Originally Posted by craiger

Want to run a .040 over 400 pontiac72-7500 rpm.

stock 68 400 crank, 63 421 sd reconditioned rods, .040 10:5 trw pistons 68 pontiac 400 heads comp. valve job with 1.65 harlan sharp rockers offenhauser low rise 2 4 bbl. manifold with 2 625 afbs, .600 lift 270 duration flat tappet cam, jackson gear drive, ati balancer, freshened mallory super mag circa 1970, butler valley support. 93 octane pump gas???

will my junk live to 7500 rpm,, have had bbcs,sbcs, 426 hemis, but never a poncho and have not a clue

craig esposito
sagarth.espo@gmail.com

All of the Pontiac people/racers I know, talk low rpm torque, not 7500.
Looking forward to other replies.
Good luck with your project.

Mike A114

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.

craiger · 10-31-2017, 09:06 AM

anybody that wants to b.s. and tell me i'm a moron give me a call

especially bruce fulper

330 831 4480 anytime

10-30-2017, 02:25 AM	#1
craiger Junior Member Join Date: Jan 2016 Posts: 28 Likes: 0 Liked 0 Times in 0 Posts	HELP,HELP pontiac gurus Want to run a .040 over 400 pontiac72-7500 rpm. stock 68 400 crank, 63 421 sd reconditioned rods, .040 10:5 trw pistons 68 pontiac 400 heads comp. valve job with 1.65 harlan sharp rockers offenhauser low rise 2 4 bbl. manifold with 2 625 afbs, .600 lift 270 duration flat tappet cam, jackson gear drive, ati balancer, freshened mallory super mag circa 1970, butler valley support. 93 octane pump gas??? will my junk live to 7500 rpm,, have had bbcs,sbcs, 426 hemis, but never a poncho and have not a clue craig esposito sagarth.espo@gmail.com

10-30-2017, 08:10 AM	#3
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: HELP,HELP pontiac gurus "will my junk live to 7500 rpm" NO ! __________________ Rich Biebel S/C 1479

10-30-2017, 12:08 PM	#4
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 885 Likes: 63 Liked 221 Times in 102 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	#5
1legjerry Junior Member Join Date: Jul 2011 Posts: 68 Likes: 4 Liked 59 Times in 9 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	#6
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 694 Likes: 2,255 Liked 219 Times in 105 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, E/FS ,L/SA 6526

10-30-2017, 11:12 PM	#8
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	#9
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.

10-31-2017, 09:06 AM	#10
craiger Junior Member Join Date: Jan 2016 Posts: 28 Likes: 0 Liked 0 Times in 0 Posts	Re: HELP,HELP pontiac gurus anybody that wants to b.s. and tell me i'm a moron give me a call especially bruce fulper 330 831 4480 anytime